Pub Date : 2026-03-01Epub Date: 2026-02-06DOI: 10.1016/j.jcz.2026.02.004
Francesco Saponi , Agata Cesaretti , Anush Kosakyan , Valentina Serra , M. Antonio Todaro
{"title":"Corrigendum to “Phylogenetic position of Setopus (Gastrotricha, Paucitubulatina) among planktonic Gastrotricha, with the description of a new species” [Zool. Anz. (2026) 248-261]","authors":"Francesco Saponi , Agata Cesaretti , Anush Kosakyan , Valentina Serra , M. Antonio Todaro","doi":"10.1016/j.jcz.2026.02.004","DOIUrl":"10.1016/j.jcz.2026.02.004","url":null,"abstract":"","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Page 333"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stick insects are herbivorous animals found in tropical, subtropical or temperate regions worldwide. Their digestive system is typically tubular, divided into regions with subregions that can vary among species. Arumatia dubia (Phasmatodea: Diapheromeridae) is a species that has undergone several taxonomic changes based on recent studies of external morphology, but morpho-histological analyses of internal organs, such as the digestive system, can contribute with identification to these and other Phasmatodea species. This study aimed to describe the digestive system of third instar A. dubia nymphs, using histochemical techniques and scanning electron microscopy. The digestive system of A. dubia consists of three regions and their subregions: foregut (esophagus and crop), midgut (anterior and posterior), and hindgut (ileum and rectum). The foregut has a simple epithelium covered by the tunica intima, and externally, surrounded by muscle fibers. The midgut features columnar cells with a brush border and regenerative cells. Malpighian tubules originate in the ileum (hindgut) and have an excretory function. This study provides detailed morpho-histological data on third instar A. dubia gut, contributing important information about the morphology and histology of the digestive system of this species.
{"title":"The digestive system of the Arumatia dubia (Phasmatodea: Diapheromeridae): a morpho-histology characterization","authors":"Giovana Gomes Ferreira Matos , Matheus Froes Caetano de Castro , Elton Luiz Scudeler , Satiko Nanya , Bruno Vinícius Daquila , Helio Conte","doi":"10.1016/j.jcz.2025.12.004","DOIUrl":"10.1016/j.jcz.2025.12.004","url":null,"abstract":"<div><div>Stick insects are herbivorous animals found in tropical, subtropical or temperate regions worldwide. Their digestive system is typically tubular, divided into regions with subregions that can vary among species. <em>Arumatia dubia</em> (Phasmatodea: Diapheromeridae) is a species that has undergone several taxonomic changes based on recent studies of external morphology, but morpho-histological analyses of internal organs, such as the digestive system, can contribute with identification to these and other Phasmatodea species. This study aimed to describe the digestive system of third instar <em>A. dubia</em> nymphs, using histochemical techniques and scanning electron microscopy. The digestive system of <em>A. dubia</em> consists of three regions and their subregions: foregut (esophagus and crop), midgut (anterior and posterior), and hindgut (ileum and rectum). The foregut has a simple epithelium covered by the tunica intima, and externally, surrounded by muscle fibers. The midgut features columnar cells with a brush border and regenerative cells. Malpighian tubules originate in the ileum (hindgut) and have an excretory function. This study provides detailed morpho-histological data on third instar <em>A. dubia</em> gut, contributing important information about the morphology and histology of the digestive system of this species.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 1-5"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2025-12-11DOI: 10.1016/j.jcz.2025.12.003
Leonardo Polizeli , Ângelo Parise Pinto
Bionoblatta Rehn, 1940 is allocated in the poorly known and intriguing Brachycolini, a Neotropical tribe with eight genera and 44 blaberid species. This outstanding genus of cockroaches encompasses mostly montane and brachypterous species, all endemic to Brazil. Nevertheless, they are moderate sized and noticeable species due to coloration, pronotum shape, and callosities on the abdomen, all taxonomic knowledge is based on a small number of males. In this study, we revisit the taxonomy of Bionoblatta, based on a comparative morphological analysis, providing a comprehensive overview of the genus. Our results support Bionoblatta as a taxonomically distinguishable genus comprising six species with a distribution range exclusively in southeastern Brazil. Bionoblatta marcellisp. nov. is herein introduced (holotype male deposited in DZUP: Brazil, Minas Gerais State, Catas Altas) based on males, females, and nymphs. A diagnosis, notes on morphology and natural history, photographs of type and non-type specimens, a distribution map, and an identification key are provided for the species. We hope this study inspires further investigations into this fascinating group of cockroaches, deepening our understanding of their evolutionary history. Future research could explore their phylogeny and biogeography, habitat and social behavior, as well as intra- and interspecific morphological variations.
{"title":"Revisiting the Brazilian giant cockroaches of the genus Bionoblatta (Blattodea: Blaberidae): taxonomic revision with description of Bionoblatta marcelli sp. nov. from Serra do Caraça, a mountain range in Minas Gerais State","authors":"Leonardo Polizeli , Ângelo Parise Pinto","doi":"10.1016/j.jcz.2025.12.003","DOIUrl":"10.1016/j.jcz.2025.12.003","url":null,"abstract":"<div><div><em>Bionoblatta</em> Rehn, 1940 is allocated in the poorly known and intriguing Brachycolini, a Neotropical tribe with eight genera and 44 blaberid species. This outstanding genus of cockroaches encompasses mostly montane and brachypterous species, all endemic to Brazil. Nevertheless, they are moderate sized and noticeable species due to coloration, pronotum shape, and callosities on the abdomen, all taxonomic knowledge is based on a small number of males. In this study, we revisit the taxonomy of <em>Bionoblatta</em>, based on a comparative morphological analysis, providing a comprehensive overview of the genus. Our results support <em>Bionoblatta</em> as a taxonomically distinguishable genus comprising six species with a distribution range exclusively in southeastern Brazil. <em>Bionoblatta marcelli</em> <strong>sp. nov.</strong> is herein introduced (holotype male deposited in DZUP: Brazil, Minas Gerais State, Catas Altas) based on males, females, and nymphs. A diagnosis, notes on morphology and natural history, photographs of type and non-type specimens, a distribution map, and an identification key are provided for the species. We hope this study inspires further investigations into this fascinating group of cockroaches, deepening our understanding of their evolutionary history. Future research could explore their phylogeny and biogeography, habitat and social behavior, as well as intra- and interspecific morphological variations.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 85-103"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-02-13DOI: 10.1016/j.jcz.2026.02.009
Bruna Silva Lisboa , José Eduardo Serrão , Jamile Fernanda Silva Cossolin , Germano Leão Demolin Leite , José Cola Zanuncio , Sebastião Lourenço de Assis Júnior , Pedro Guilherme Lemes
Atopozelus opsimus Elkins, 1954 (Heteroptera: Reduviidae), native from Brazil, prey forest pests but its morphology needs further studies. The aim was to describe the anatomy and histology of the female ovaries and the male reproductive tract of A. opsimus, with emphasis on gamete formation. The organs were dissected and analyzed with light microscopy. The females have a pair of meroistic-telotrophic ovaries with seven ovarioles with oocytes in different developmental stages, two lateral oviducts, a common oviduct, two yellow spermathecae, and a genital chamber. The male reproductive tract consists of a pair of testes with seven follicles each lined by a transparent peritoneal sheath and continuously spermatozoa production; two deferent ducts with yellow seminal vesicles; a pair of ectadenial accessory glands; and an ejaculatory duct. The ovaries and male reproductive tract indicate characteristics of A. opsimus similar to a common ancestor of Heteroptera.
{"title":"Anatomy and histology of the ovaries and male reproductive tract of Atopozelus opsimus (Heteroptera: Reduviidae)","authors":"Bruna Silva Lisboa , José Eduardo Serrão , Jamile Fernanda Silva Cossolin , Germano Leão Demolin Leite , José Cola Zanuncio , Sebastião Lourenço de Assis Júnior , Pedro Guilherme Lemes","doi":"10.1016/j.jcz.2026.02.009","DOIUrl":"10.1016/j.jcz.2026.02.009","url":null,"abstract":"<div><div><em>Atopozelus opsimus</em> Elkins, 1954 (Heteroptera: Reduviidae), native from Brazil, prey forest pests but its morphology needs further studies. The aim was to describe the anatomy and histology of the female ovaries and the male reproductive tract of <em>A. opsimus</em>, with emphasis on gamete formation. The organs were dissected and analyzed with light microscopy. The females have a pair of meroistic-telotrophic ovaries with seven ovarioles with oocytes in different developmental stages, two lateral oviducts, a common oviduct, two yellow spermathecae, and a genital chamber. The male reproductive tract consists of a pair of testes with seven follicles each lined by a transparent peritoneal sheath and continuously spermatozoa production; two deferent ducts with yellow seminal vesicles; a pair of ectadenial accessory glands; and an ejaculatory duct. The ovaries and male reproductive tract indicate characteristics of <em>A. opsimus</em> similar to a common ancestor of Heteroptera.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 432-439"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147421174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Soldierfish, a group of commercially important coral reef fishes from the genus Myripristis, are commonly caught by local fishermen in the waters of Aceh Besar, Indonesia. Despite their economic importance, limited information exists regarding their bioecological characteristics, particularly genetic and morphometric traits. This study aimed to investigate morphological and genetic variation among six Myripristis species: M. adusta, M. berndti, M. kuntee, M. murdjan, M. violacea, and M. vittata harvested in Aceh Besar waters, Indonesia. The research was conducted from August 2024 to March 2025. Fish samples were collected from five landing sites in Aceh Besar District, namely Pulo Aceh, Ujung Pancu, Lam Awe, Lhokseudu, and Lampulo. A total of 360 specimens were measured for morphometric analysis, with 60 individuals representing each species. Additionally, five individuals from each species were randomly selected for DNA analysis based on the cytochrome oxidase subunit I (COI) gene. Data were analyzed using ANOVA and Discriminant Function Analysis (DFA). A Mantel test was performed to assess the correlation between genetic and morphometric distance matrices. Morphological analysis identified head length (HL) and eye diameter (ED) as key discriminating traits among species. Cross-validation of the DFA revealed a high degree of similarity between M. adusta and M. violacea. Genetic analysis validated the separation into six distinct species. The smallest genetic distance was observed between M. adusta and M. violacea (4.2 %), while the greatest distance was between M. murdjan and M. kuntee (8.5 %). A total of 23 haplotypes were identified across six species, the highest number of haplotypes in M. kuntee and M. murdjan each exhibited five haplotypes. Correlation analysis revealed no significant relationship between morphometric and genetic variation (r = 0.173; p > 0.05). These findings indicate that genetic approaches provide an effective tool for validating species-level taxonomic status within the genus Myripristis.
{"title":"Morphometric and genetic variation of six soldierfish species (genus Myripristis, family: Holocentridae) harvested in Aceh Besar waters, Indonesia","authors":"Nadya Tirta , Essy Harnelly , Rania Feranita Fachri , Putri Khairani Amalia Siregar , Nanda Muhammad Razi , Nanda Ulfa Khaira , Mutia Ramadhaniaty , Sri Riska Rahayu , Nurlita Putri Anggraini , Raissha Amanda Siregar , Adrian Damora , Nur Fadli","doi":"10.1016/j.jcz.2026.01.004","DOIUrl":"10.1016/j.jcz.2026.01.004","url":null,"abstract":"<div><div>Soldierfish, a group of commercially important coral reef fishes from the genus <em>Myripristis</em>, are commonly caught by local fishermen in the waters of Aceh Besar, Indonesia. Despite their economic importance, limited information exists regarding their bioecological characteristics, particularly genetic and morphometric traits. This study aimed to investigate morphological and genetic variation among six <em>Myripristis</em> species: <em>M. adusta</em>, <em>M. berndti</em>, <em>M. kuntee</em>, <em>M. murdjan</em>, <em>M. violacea</em>, and <em>M. vittata</em> harvested in Aceh Besar waters, Indonesia. The research was conducted from August 2024 to March 2025. Fish samples were collected from five landing sites in Aceh Besar District, namely Pulo Aceh, Ujung Pancu, Lam Awe, Lhokseudu, and Lampulo. A total of 360 specimens were measured for morphometric analysis, with 60 individuals representing each species. Additionally, five individuals from each species were randomly selected for DNA analysis based on the cytochrome oxidase subunit I (COI) gene. Data were analyzed using ANOVA and Discriminant Function Analysis (DFA). A Mantel test was performed to assess the correlation between genetic and morphometric distance matrices. Morphological analysis identified head length (HL) and eye diameter (ED) as key discriminating traits among species. Cross-validation of the DFA revealed a high degree of similarity between <em>M. adusta</em> and <em>M. violacea</em>. Genetic analysis validated the separation into six distinct species. The smallest genetic distance was observed between <em>M. adusta</em> and <em>M. violacea</em> (4.2 %), while the greatest distance was between <em>M. murdjan</em> and <em>M. kuntee</em> (8.5 %). A total of 23 haplotypes were identified across six species, the highest number of haplotypes in <em>M. kuntee</em> and <em>M. murdjan</em> each exhibited five haplotypes. Correlation analysis revealed no significant relationship between morphometric and genetic variation (r = 0.173; p > 0.05). These findings indicate that genetic approaches provide an effective tool for validating species-level taxonomic status within the genus <em>Myripristis</em>.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 136-148"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-01-12DOI: 10.1016/j.jcz.2026.01.008
Fengping Li , Aimin Wang , Chunsheng Liu , Yu Sun , Zhifeng Gu , Yi Yang
The family Xenophoridae (carrier shells), comprising marine gastropods distinguished by their unique shell-attaching behavior, has attracted scientific interest since the 19th century. Despite this attention, its phylogenetic position and internal intergeneric relationships remain contentious. This study sequenced complete mitochondrial genomes of four xenophorid species—Stellaria solaris, Aspidophoreas chinensis, Xenophora conchyliophora, and Xenophora cerea—to resolve the phylogeny and systematic placement of this family. Comparative analyses revealed high mitochondrial genome similarity among these species in structure, size, gene order, and nucleotide composition. The mitochondrial genomes exhibited significant nucleotide variation among protein-coding genes. Selection pressure analyses indicate purifying selection across all PCGs, with atp8 showing the weakest evolutionary constraint. This suggests that atp8 may be subject to stronger selective pressures, potentially reflecting substantial energy demands associated with xenophorids' unique attachment ecology. Phylogenetic reconstruction supported two major clades within Stromboidea: Clade I included Strombidae + (Rostellariidae + Seraphsidae) and Clade II comprised Xenophoridae + (Struthiolariidae + Aporrhaidae). Internally, Xenophoridae exhibited a strongly supported clade (Onustus + Stellaria) + Aspidophoreas that aligned with morphological classifications and features with reduced/absent object attachment, clearly separating it from Xenophora. Notably, Xenophora japonica did not form a monophyletic group with the sister taxa X. conchyliophora and X. cerea. Morphological and molecular evidence collectively indicate that the current taxonomy of Xenophora requires revision.
{"title":"Comparative mitogenomic analysis of family Xenophoridae (Mollusca, Stromboidea) and its implication for phylogeny","authors":"Fengping Li , Aimin Wang , Chunsheng Liu , Yu Sun , Zhifeng Gu , Yi Yang","doi":"10.1016/j.jcz.2026.01.008","DOIUrl":"10.1016/j.jcz.2026.01.008","url":null,"abstract":"<div><div>The family Xenophoridae (carrier shells), comprising marine gastropods distinguished by their unique shell-attaching behavior, has attracted scientific interest since the 19th century. Despite this attention, its phylogenetic position and internal intergeneric relationships remain contentious. This study sequenced complete mitochondrial genomes of four xenophorid species—<em>Stellaria solaris</em>, <em>Aspidophoreas chinensis</em>, <em>Xenophora conchyliophora</em>, and <em>Xenophora cerea</em>—to resolve the phylogeny and systematic placement of this family. Comparative analyses revealed high mitochondrial genome similarity among these species in structure, size, gene order, and nucleotide composition. The mitochondrial genomes exhibited significant nucleotide variation among protein-coding genes. Selection pressure analyses indicate purifying selection across all PCGs, with <em>atp8</em> showing the weakest evolutionary constraint. This suggests that <em>atp8</em> may be subject to stronger selective pressures, potentially reflecting substantial energy demands associated with xenophorids' unique attachment ecology. Phylogenetic reconstruction supported two major clades within Stromboidea: Clade I included Strombidae + (Rostellariidae + Seraphsidae) and Clade II comprised Xenophoridae + (Struthiolariidae + Aporrhaidae). Internally, Xenophoridae exhibited a strongly supported clade (<em>Onustus</em> + <em>Stellaria</em>) + <em>Aspidophoreas</em> that aligned with morphological classifications and features with reduced/absent object attachment, clearly separating it from <em>Xenophora</em>. Notably, <em>Xenophora japonica</em> did not form a monophyletic group with the sister taxa <em>X. conchyliophora</em> and <em>X. cerea</em>. Morphological and molecular evidence collectively indicate that the current taxonomy of <em>Xenophora</em> requires revision.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 125-135"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stick insect systematics has been traditionally based on external morphology, which was believed to be sufficiently informative. However, molecular data repeatedly show convergence and underestimation of species diversity due, in part, to the superficiality of morphological diagnoses based on external characters. In contrast, the internal male genitalia have proved to be useful for assessing species diversity, but remain poorly studied because of their complexity and variation. Nevertheless, interest in internal male genitalia has recently increased as they provide an important number of additional characters useful to identify species for which the traditional sets of characters are insufficient. To date, the genitalia of 105 species from 55 genera belonging to 13 families are known, but comparative approaches across taxa are difficult due to different terminology. Our aim is to propose a nomenclature for the genitalia of Diapheromerini that can be used for standardized descriptions as well as for the postulation of homology assessments. We focused on Pseudosermyle, the most diverse genus in North America, which exhibits many different shapes: phasmid appearance and genitalia. We reviewed the literature on internal male genitalia in Phasmatodea and examined it, as well as the external male genitalia in different Diapheromerini species. This is the first attempt to use these structures to identify orthologues as potential homologues within Phasmatodea. We hope that our study will improve communication and promote systematic analysis of internal and external male genitalia, at least in Diapheromerini.
{"title":"Proposed terminology in describing both internal and external male genitalia in Diapheromerini with emphasis on Pseudosermyle Caudell, 1903 (Insecta: Phasmatodea)","authors":"Ulises López-Mora , Thies Henning Büscher , Helga Ochoterena-Booth , Ismael A. Hinojosa-Díaz","doi":"10.1016/j.jcz.2026.01.003","DOIUrl":"10.1016/j.jcz.2026.01.003","url":null,"abstract":"<div><div>Stick insect systematics has been traditionally based on external morphology, which was believed to be sufficiently informative. However, molecular data repeatedly show convergence and underestimation of species diversity due, in part, to the superficiality of morphological diagnoses based on external characters. In contrast, the internal male genitalia have proved to be useful for assessing species diversity, but remain poorly studied because of their complexity and variation. Nevertheless, interest in internal male genitalia has recently increased as they provide an important number of additional characters useful to identify species for which the traditional sets of characters are insufficient. To date, the genitalia of 105 species from 55 genera belonging to 13 families are known, but comparative approaches across taxa are difficult due to different terminology. Our aim is to propose a nomenclature for the genitalia of Diapheromerini that can be used for standardized descriptions as well as for the postulation of homology assessments. We focused on <em>Pseudosermyle</em>, the most diverse genus in North America, which exhibits many different shapes: phasmid appearance and genitalia. We reviewed the literature on internal male genitalia in Phasmatodea and examined it, as well as the external male genitalia in different Diapheromerini species. This is the first attempt to use these structures to identify orthologues as potential homologues within Phasmatodea. We hope that our study will improve communication and promote systematic analysis of internal and external male genitalia, at least in Diapheromerini.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 179-197"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2026-02-10DOI: 10.1016/j.jcz.2026.02.007
Alexei V. Tchesunov , Sergei A. Subbotin , Vladimir V. Yushin
A review of the genus Siphonolaimus together with descriptions and a redescription of two new and one known species are given. New genus diagnosis is emended. Main morphometric and morphological characters differentiating Siphonolaimus species are compiled in the table that can ease species identification. Full redescription of Siphonolaimus ewensis Warwick and Platt, 1973 is given; the species has been discovered initially from a sandy beach of Scotland and now found in upper sublittoral sandy sediment of the White Sea, North Russia. Two new Siphonolaimus species are found in the same locality at 30 m depth in silty sediment in the Sea of Japan. Siphonolaimus gracilis sp. n. is characterized with very short anterior and subcephalic setae and combination of other morphometric values. Siphonolaimus corpulentus sp. n. is close to S. gracilis sp. n. and differs with stout body and wider amphideal fovea. Two new species are featured by high variability of submedian outer labial setae length; females of all three species studied show high variability in body length and related body shape indices due to frequent loss of tail or hind body part. New species were characterized using sequences of partial 18S rRNA, 28S, ITS rRNA and COI genes. Phylogenetic relationships of the genus Siphonolaimus with other Siphonolaimidae and related taxa are presented and discussed. Phylogenetic analysis of the D2-D3 of 28S rRNA sequences placed family Siphonolaimoidae; within the crown of the family Linhomoeidae. 18S rRNA data do not support position of Astomonema within Siphonolaimidae but places the genus in the family Linhomoeidae. Desmolaimus magnus is considered here based on morphology and molecular study as a representative of the genus Eleutherolaimus: Eleutherolaimus magnus comb. n.
{"title":"Revision of the species composition in the genus Siphonolaimus de Man, 1893 (Nematoda, Chromadoria, Monhysterida) together with description of two new and one known species","authors":"Alexei V. Tchesunov , Sergei A. Subbotin , Vladimir V. Yushin","doi":"10.1016/j.jcz.2026.02.007","DOIUrl":"10.1016/j.jcz.2026.02.007","url":null,"abstract":"<div><div>A review of the genus <em>Siphonolaimus</em> together with descriptions and a redescription of two new and one known species are given. New genus diagnosis is emended. Main morphometric and morphological characters differentiating <em>Siphonolaimus</em> species are compiled in the table that can ease species identification. Full redescription of <em>Siphonolaimus ewensis</em> Warwick and Platt, 1973 is given; the species has been discovered initially from a sandy beach of Scotland and now found in upper sublittoral sandy sediment of the White Sea, North Russia. Two new <em>Siphonolaimus</em> species are found in the same locality at 30 m depth in silty sediment in the Sea of Japan. <em>Siphonolaimus gracilis</em> sp. n. is characterized with very short anterior and subcephalic setae and combination of other morphometric values. <em>Siphonolaimus corpulentus</em> sp. n. is close to <em>S. gracilis</em> sp. n. and differs with stout body and wider amphideal fovea. Two new species are featured by high variability of submedian outer labial setae length; females of all three species studied show high variability in body length and related body shape indices due to frequent loss of tail or hind body part. New species were characterized using sequences of partial 18S rRNA, 28S, ITS rRNA and <em>COI</em> genes. Phylogenetic relationships of the genus <em>Siphonolaimus</em> with other Siphonolaimidae and related taxa are presented and discussed. Phylogenetic analysis of the D2-D3 of 28S rRNA sequences placed family Siphonolaimoidae; within the crown of the family Linhomoeidae. 18S rRNA data do not support position of <em>Astomonema</em> within Siphonolaimidae but places the genus in the family Linhomoeidae. <em>Desmolaimus magnus</em> is considered here based on morphology and molecular study as a representative of the genus <em>Eleutherolaimus</em>: <em>Eleutherolaimus magnus</em> comb. n.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 413-431"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147421173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Homeomorphy is common in the valves and carapaces of Ostracoda. One of the best-known examples in non-marine ostracods is the morphological similarity in the extreme armature of anterior and posterior spines on the left valve in both Strandesia bicornuta Hartmann, 1964 from India and in Rudjakoviella prolongata (Triebel, 1962) Malz, 1973 from Margarita Island (West Indies). Here, we describe a third representative with such armature, Pseudocypricercus bonito gen. nov. spec. nov. from Brazil. These new taxa belong to the Cypricercinae McKenzie, 1971, which is characterized by the presence of the Triebel's loop in the middle of the attachment of the caudal ramus. The main characteristics of Pseudocypricercus gen. nov. are the shape and length of the β seta on the mandibular palp, which is slender and elongated, compared to other genera of this subfamily; the absence of seta d on the first thoracopod, and the absence of seta d2 on the second thoracopod, amongst other features. Pseudocypricercus bonito gen. nov. spec. nov. also has large anterior and posterior spines on the left valve as well as a posterior spine and the anterior blunt protrusion on the right valve. In addition, both the mandibular coxa and the third endite of the maxillula have remarkable large fist-like setae, while the male right prehensive palp has a perpendicularly positioned second segment. The similar armature on left valve and right valve in this taxon makes the homeomorphy known from R. prolongata and S. bicornuta into a “three-species problem”.
{"title":"A three-species problem: a further example of homeomorphy in freshwater Ostracoda (Crustacea), with the description of a new genus and new species from a Brazilian river","authors":"Kevin Galvão Correia , Nadiny Martins Almeida , Koen Martens , Janet Higuti","doi":"10.1016/j.jcz.2025.10.009","DOIUrl":"10.1016/j.jcz.2025.10.009","url":null,"abstract":"<div><div>Homeomorphy is common in the valves and carapaces of Ostracoda. One of the best-known examples in non-marine ostracods is the morphological similarity in the extreme armature of anterior and posterior spines on the left valve in both <em>Strandesia bicornuta</em> Hartmann, 1964 from India and in <em>Rudjakoviella prolongata</em> (Triebel, 1962) Malz, 1973 from Margarita Island (West Indies). Here, we describe a third representative with such armature, <em>Pseudocypricercus bonito</em> gen. nov. spec. nov. from Brazil. These new taxa belong to the Cypricercinae McKenzie, 1971, which is characterized by the presence of the Triebel's loop in the middle of the attachment of the caudal ramus. The main characteristics of <em>Pseudocypricercus</em> gen. nov. are the shape and length of the β seta on the mandibular palp, which is slender and elongated, compared to other genera of this subfamily; the absence of seta d on the first thoracopod, and the absence of seta d2 on the second thoracopod, amongst other features. <em>Pseudocypricercus bonito</em> gen. nov. spec. nov. also has large anterior and posterior spines on the left valve as well as a posterior spine and the anterior blunt protrusion on the right valve. In addition, both the mandibular coxa and the third endite of the maxillula have remarkable large fist-like setae, while the male right prehensive palp has a perpendicularly positioned second segment. The similar armature on left valve and right valve in this taxon makes the homeomorphy known from <em>R. prolongata</em> and <em>S. bicornuta</em> into a “three-species problem”.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 461-480"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147421185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of behavioral control studies for Thyrinteina arnobia (Stoll, 1782) (Lepidoptera: Geometridae) involves the elucidation of the chemical ecology, which begins with the observation of the calling sexual behavior through the exposure of females abdominal gland. After the pheromone release, the perception of chemical substances is carried out in the sensilla of male antennae, whose characterization can be carried out using scanning electron microscopy (SEM). Thus, this research aimed to ultrastructurally characterize the antennal sensilla of males and females of T. arnobia. For the characterization of the structural morphology of the sensilla in the antennae of females and males of T. arnobia, scanning electron microscopy was used. In total, six types of sensilla were identified, and characterized in trichoid, squamiform, caetic, basiconic, celoconic and styloconic. The antennae of female and male T. arnobia have different structural morphology of sensilla. The trichoid sensilla are the most abundant, mainly in the antennae of males, indicating that they can respond to stimuli from chemical substances, since these sensilla are recognized for their sex pheromone receptor function. The present study allows a better understanding of the sexual dimorphism between female and male T. arnobia.
{"title":"Morphological characterization and distribution of antennal sensilla on Thyrinteina arnobia (Stoll, 1782) (Lepidoptera: Geometridae)","authors":"Elmadã Pereira Gonzaga , Camila Alexandre Cavalcante de Almeida , Lucas Teles Bezerra , Maclauds Nathan Feliciano Salmento , Fernanda da Silva Gonçalves , Henrique Fonseca Goulart , Antônio Euzébio Goulart Santana , Johnnatan Duarte de Freitas , Mariana Oliveira Breda","doi":"10.1016/j.jcz.2026.01.007","DOIUrl":"10.1016/j.jcz.2026.01.007","url":null,"abstract":"<div><div>The development of behavioral control studies for <em>Thyrinteina arnobia</em> (Stoll, 1782) (Lepidoptera: Geometridae) involves the elucidation of the chemical ecology, which begins with the observation of the calling sexual behavior through the exposure of females abdominal gland. After the pheromone release, the perception of chemical substances is carried out in the sensilla of male antennae, whose characterization can be carried out using scanning electron microscopy (SEM). Thus, this research aimed to ultrastructurally characterize the antennal sensilla of males and females of <em>T. arnobia</em>. For the characterization of the structural morphology of the sensilla in the antennae of females and males of <em>T. arnobia</em>, scanning electron microscopy was used. In total, six types of sensilla were identified, and characterized in trichoid, squamiform, caetic, basiconic, celoconic and styloconic. The antennae of female and male <em>T. arnobia</em> have different structural morphology of sensilla. The trichoid sensilla are the most abundant, mainly in the antennae of males, indicating that they can respond to stimuli from chemical substances, since these sensilla are recognized for their sex pheromone receptor function. The present study allows a better understanding of the sexual dimorphism between female and male <em>T. arnobia</em>.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"321 ","pages":"Pages 213-221"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}