Pub Date : 2023-11-27DOI: 10.1080/14772000.2023.2272835
Zohreh Pourghorban, Yasaman Salmaki, Maximilian Weigend
Recent phylogenetic studies have challenged the traditional classification of the subtribe Cynoglossinae, which was based on nutlet characteristics. To investigate the evolution of fruit traits rel...
{"title":"Ancestral state reconstruction reveals extensive homoplasy in nutlet characters of Cynoglossinae (Boraginaceae, subfam. Cynoglossoideae, tribe Cynoglosseae)","authors":"Zohreh Pourghorban, Yasaman Salmaki, Maximilian Weigend","doi":"10.1080/14772000.2023.2272835","DOIUrl":"https://doi.org/10.1080/14772000.2023.2272835","url":null,"abstract":"Recent phylogenetic studies have challenged the traditional classification of the subtribe Cynoglossinae, which was based on nutlet characteristics. To investigate the evolution of fruit traits rel...","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"2 18","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138495809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AbstractThe subclass Cyrtophoria is a group of morphologically specialized ciliates with diverse characteristics, which can be found in a variety of aquatic and terrestrial habitats. In the present study, two cyrtophorian ciliates, Aegyria oliva Claparède & Lachmann, Citation1859 and A. peculiaris sp. nov., isolated from coastal waters of China, were investigated based on microscopic observations of live and protargol-stained specimens, and SSU rRNA gene sequence analyses. For A. oliva, the type species of the genus, detailed morphometric data, and improved diagnosis are provided. The new species, Aegyria peculiaris sp. nov. is characterized by a body size of 70–115 × 30–65 μm in vivo, an inverted oval body shape with a protrusion at the anterior left and a posterior bulge on the dorsal side, 45–58 somatic kineties, 31–46 nematodesmal rods, 4–6 transpodial segments, and about six contractile vacuoles. Phylogenetic analyses unveiled a close relationship between the newly identified species and A. foissneri, thereby confirming the monophyly of the genus Aegyria. http://zoobank.org/urn:lsid:zoobank.org:pub:F5566374-DA6C-4E95-B8DA-19F935D949C8Key words: Aegyria peculiarisciliary patternciliatediversityperiphytonphylogenySSU rRNA gene Disclosure statementNo potential conflict of interest was reported by the author(s).Supplemental materialSupplemental material for this article can be accessed here: https://doi.org/10.1080/14772000.2023.2269150.Associate Editor: Dr David WilliamsAdditional informationFundingThis work was supported by the National Natural Science Foundation of China [project number: 42276094].
{"title":"Taxonomic and phylogenetic studies on two marine Cyrtophoria ciliates (Protista: Ciliophora: Phyllopharyngea) with the description of a new species","authors":"Congcong Wang, Limin Jiang, Lijian Liao, Zhishuai Qu, Santosh Kumar, Xiaozhong Hu","doi":"10.1080/14772000.2023.2269150","DOIUrl":"https://doi.org/10.1080/14772000.2023.2269150","url":null,"abstract":"AbstractThe subclass Cyrtophoria is a group of morphologically specialized ciliates with diverse characteristics, which can be found in a variety of aquatic and terrestrial habitats. In the present study, two cyrtophorian ciliates, Aegyria oliva Claparède & Lachmann, Citation1859 and A. peculiaris sp. nov., isolated from coastal waters of China, were investigated based on microscopic observations of live and protargol-stained specimens, and SSU rRNA gene sequence analyses. For A. oliva, the type species of the genus, detailed morphometric data, and improved diagnosis are provided. The new species, Aegyria peculiaris sp. nov. is characterized by a body size of 70–115 × 30–65 μm in vivo, an inverted oval body shape with a protrusion at the anterior left and a posterior bulge on the dorsal side, 45–58 somatic kineties, 31–46 nematodesmal rods, 4–6 transpodial segments, and about six contractile vacuoles. Phylogenetic analyses unveiled a close relationship between the newly identified species and A. foissneri, thereby confirming the monophyly of the genus Aegyria. http://zoobank.org/urn:lsid:zoobank.org:pub:F5566374-DA6C-4E95-B8DA-19F935D949C8Key words: Aegyria peculiarisciliary patternciliatediversityperiphytonphylogenySSU rRNA gene Disclosure statementNo potential conflict of interest was reported by the author(s).Supplemental materialSupplemental material for this article can be accessed here: https://doi.org/10.1080/14772000.2023.2269150.Associate Editor: Dr David WilliamsAdditional informationFundingThis work was supported by the National Natural Science Foundation of China [project number: 42276094].","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"38 20","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135820032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-23DOI: 10.1080/14772000.2023.2249891
Bitupan Boruah, Surya Narayanan, Jason D. Gerard, Abhijit Das, V. Deepak
AbstractWe describe a new species of the genus Alcalus from the northeast Indian state of Arunachal Pradesh based on molecular, morphological, and osteological characters. The new species differs from its congeners based on a combination of morphological characters including snout-vent length (27–28 mm in males; 29.9–36.2 mm in females), disc on fingers and toes with horizontal/transverse groove on the dorsal surface, dorsal skin wrinkled, and a pair of faint dorsolateral stripes on back. The new species also differs from its congeners by a DNA sequence divergence of 7.6–25.4% in the mitochondrial gene fragment 12S–tVal–16S rRNA (1533 base pairs). We include a detailed osteological description of the new species and compare it with the type of this genus. This is the first record of this genus from India, which was recently also reported from Myanmar and Western China. Discovery of a new species from northeast India indicates the need for a systematic study to uncover the hidden diversity of the Indo-Burma biodiversity hotspot. http://zoobank.org/urn:lsid:zoobank.org:pub:FB75F850-2AD9-4643-97CE-7F3F1D58E3F8 http://zoobank.org/urn:lsid:zoobank.org:act:6104F7A5-7E5E-42A7-90A1-810C394CFB3EKey words: Arunachal PradeshIndo-Burma biodiversity hotspotNamdapha Tiger Reserveosteologyphylogeny AcknowledgementsWe are very thankful to Arunachal Pradesh Forest Department for the research permit (CWL/GEN/355/2021/3178 dated 28 September 2021). Thanks are also due to Aduk Paron (Field Director), Tajum Yomcha (Research officer), Mayur Variya (Biologist), and all the forest staff of Namdapha Tiger Reserve for logistical support. We would like to thank the Director and Dean, Wildlife Institute of India, Dehradun for their constant support. We thank Naitik G. Patel, Vijayan Jithin, Santanu Dey, Rajiv N.V., and Aphu Yoha Yobin for their help during fieldwork. We thank Patrick Campbell, David Gower, and Jeff Streicher at NHM, London for their support. Surya thanks N.A. Aravind for his support at ATREE, Bengaluru. We thank Chinta S. for the help in editing and correcting the language in the manuscript. We thank two anonymous reviewers and the editor for their critical comments on the earlier drafts of this manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Supplemental materialSupplemental material for this article can be accessed here: https://dx.doi.org/10.1080/14772000.2023.2249891.Associate Editor: Dr Susan TsangAdditional informationFundingWe thank the National Geographic Society for National Geographic Explorer Grant [NGS-74044R-20) and SERB-DST [CRG/2018/000790] for financial support.
{"title":"Discovery of a new species of dwarf frog (Anura: Ceratobatrachidae: <i>Alcalus</i> ) extends the northwestern distributional limits of the genus to Northeast India","authors":"Bitupan Boruah, Surya Narayanan, Jason D. Gerard, Abhijit Das, V. Deepak","doi":"10.1080/14772000.2023.2249891","DOIUrl":"https://doi.org/10.1080/14772000.2023.2249891","url":null,"abstract":"AbstractWe describe a new species of the genus Alcalus from the northeast Indian state of Arunachal Pradesh based on molecular, morphological, and osteological characters. The new species differs from its congeners based on a combination of morphological characters including snout-vent length (27–28 mm in males; 29.9–36.2 mm in females), disc on fingers and toes with horizontal/transverse groove on the dorsal surface, dorsal skin wrinkled, and a pair of faint dorsolateral stripes on back. The new species also differs from its congeners by a DNA sequence divergence of 7.6–25.4% in the mitochondrial gene fragment 12S–tVal–16S rRNA (1533 base pairs). We include a detailed osteological description of the new species and compare it with the type of this genus. This is the first record of this genus from India, which was recently also reported from Myanmar and Western China. Discovery of a new species from northeast India indicates the need for a systematic study to uncover the hidden diversity of the Indo-Burma biodiversity hotspot. http://zoobank.org/urn:lsid:zoobank.org:pub:FB75F850-2AD9-4643-97CE-7F3F1D58E3F8 http://zoobank.org/urn:lsid:zoobank.org:act:6104F7A5-7E5E-42A7-90A1-810C394CFB3EKey words: Arunachal PradeshIndo-Burma biodiversity hotspotNamdapha Tiger Reserveosteologyphylogeny AcknowledgementsWe are very thankful to Arunachal Pradesh Forest Department for the research permit (CWL/GEN/355/2021/3178 dated 28 September 2021). Thanks are also due to Aduk Paron (Field Director), Tajum Yomcha (Research officer), Mayur Variya (Biologist), and all the forest staff of Namdapha Tiger Reserve for logistical support. We would like to thank the Director and Dean, Wildlife Institute of India, Dehradun for their constant support. We thank Naitik G. Patel, Vijayan Jithin, Santanu Dey, Rajiv N.V., and Aphu Yoha Yobin for their help during fieldwork. We thank Patrick Campbell, David Gower, and Jeff Streicher at NHM, London for their support. Surya thanks N.A. Aravind for his support at ATREE, Bengaluru. We thank Chinta S. for the help in editing and correcting the language in the manuscript. We thank two anonymous reviewers and the editor for their critical comments on the earlier drafts of this manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Supplemental materialSupplemental material for this article can be accessed here: https://dx.doi.org/10.1080/14772000.2023.2249891.Associate Editor: Dr Susan TsangAdditional informationFundingWe thank the National Geographic Society for National Geographic Explorer Grant [NGS-74044R-20) and SERB-DST [CRG/2018/000790] for financial support.","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"46 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135367333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-12DOI: 10.1080/14772000.2023.2259037
Juliane Saldanha, Thiago Borges Fernandes Semedo, Ravena Fernanda Braga de Mendonça, Luan Gabriel Lima-Silva, Mariluce Rezende Messias, Iracilda Sampaio, Marcus Vinicius Brandão, Rogério Vieira Rossi
The arboreal rice rat of the genus Oecomys Thomas, 1906 is one of the most speciose genera of the subfamily Sigmodontinae, with 19 species currently recognized and occurring from eastern Panama to northern Argentina, Paraguay, and in northern, central and eastern Brazil. Herein we describe a new species using an integrative approach based on molecular, morphological, and morphometric data. We used in our assessment recently collected specimens from the states of Pará and Rondônia, one of the most deforested regions in Brazil. We examined 51 specimens of Oecomys from museum collections including name-bearing types from most of the distributional range of the genus. We also sequenced 32 specimens of Oecomys, and for the molecular analyses, we used the mitochondrial marker Cytochrome b and the nuclear marker intron 7 of β-fibrinogen. Our mitochondrial marker results recovered a strongly supported clade composed of two divergent clades (3.78%), one including lineages of O. bicolor and O. cleberi, and the other clade representing the new species. The topology of concatenated mitochondrial and nuclear data also recovered Oecomys sp. nov. as a sister lineage of the O. bicolor and O. cleberi clade. Also, both markers recovered new lineages from the O. bicolor and O. cleberi species group. The new species can be discriminated from other Oecomys species by pelage colour and craniodental characters, such as absent or small mastoid fenestra, and the presence of alisphenoid strut, small subsquamosal fenestra, presence of sphenopalatine vacuities, and presence of accessory loph of M1 and M2 paracones. The new species occurs exclusively in the Rondônia centre of endemism, delimited by the rivers Amazon to the north, Tapajós to the east, and Madeira to the west. The description of this new Oecomys increases the diversity, and also contributes to elevate Amazonian Sigmodontinae species richness and endemism in this still poorly known biome.
{"title":"Unveiling hidden diversity of <i>Oecomys</i> (Rodentia: Cricetidae) from Brazilian Central Amazonia: description of a new species and new lineages","authors":"Juliane Saldanha, Thiago Borges Fernandes Semedo, Ravena Fernanda Braga de Mendonça, Luan Gabriel Lima-Silva, Mariluce Rezende Messias, Iracilda Sampaio, Marcus Vinicius Brandão, Rogério Vieira Rossi","doi":"10.1080/14772000.2023.2259037","DOIUrl":"https://doi.org/10.1080/14772000.2023.2259037","url":null,"abstract":"The arboreal rice rat of the genus Oecomys Thomas, 1906 is one of the most speciose genera of the subfamily Sigmodontinae, with 19 species currently recognized and occurring from eastern Panama to northern Argentina, Paraguay, and in northern, central and eastern Brazil. Herein we describe a new species using an integrative approach based on molecular, morphological, and morphometric data. We used in our assessment recently collected specimens from the states of Pará and Rondônia, one of the most deforested regions in Brazil. We examined 51 specimens of Oecomys from museum collections including name-bearing types from most of the distributional range of the genus. We also sequenced 32 specimens of Oecomys, and for the molecular analyses, we used the mitochondrial marker Cytochrome b and the nuclear marker intron 7 of β-fibrinogen. Our mitochondrial marker results recovered a strongly supported clade composed of two divergent clades (3.78%), one including lineages of O. bicolor and O. cleberi, and the other clade representing the new species. The topology of concatenated mitochondrial and nuclear data also recovered Oecomys sp. nov. as a sister lineage of the O. bicolor and O. cleberi clade. Also, both markers recovered new lineages from the O. bicolor and O. cleberi species group. The new species can be discriminated from other Oecomys species by pelage colour and craniodental characters, such as absent or small mastoid fenestra, and the presence of alisphenoid strut, small subsquamosal fenestra, presence of sphenopalatine vacuities, and presence of accessory loph of M1 and M2 paracones. The new species occurs exclusively in the Rondônia centre of endemism, delimited by the rivers Amazon to the north, Tapajós to the east, and Madeira to the west. The description of this new Oecomys increases the diversity, and also contributes to elevate Amazonian Sigmodontinae species richness and endemism in this still poorly known biome.","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135968010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.1080/14772000.2023.2249896
Robert M. Lasley, Jose Christopher E. Mendoza, Gustav Paulay
Etisine crabs are some of the most abundant cryptobionts in Indo-West Pacific coral reef systems. Despite their ecological importance and abundance in museum collections, several recent systematic studies have indicated family- to subspecies-level taxonomic problems. One such case involves the former chlorodielline genus Soliella Lasley, Klaus & Ng, Citation2015 (treated here as part of Etisinae), which currently comprises two valid species and three available names that have been in flux in recent literature. The validity of these taxa has only been cursorily discussed. To resolve species limits and distributions, a thorough morphological examination of hundreds of specimens was conducted, including scanning electron microscopy of male gonopods, along with analysis of sequence data of the mitochondrial marker cytochrome c oxidase subunit I (COI) from 84 exemplars across the distribution of the genus. The status of two species that have Indian Ocean versus Pacific Ocean distributions with overlap in the Indo-Australian Archipelago and adjacent regions is confirmed. While external morphology is not reliable for identification, a few discrete, although slight, differences in gonopod morphology were found, and these results are consistent with a ‘pseudocryptic species’ designation. Speciation conforms to a previously published etisine model of allopatric differentiation followed by subsequent divergence of gonopod morphology upon secondary sympatry. This pattern, the biogeography of the two species and the concept of ‘pseudocryptic species’ are discussed.
蝶蟹是印度-西太平洋珊瑚礁系统中最丰富的隐生生物之一。尽管它们在博物馆收藏中具有重要的生态意义和丰富的数量，但最近的一些系统研究表明，它们在科到亚种水平上存在分类问题。其中一个案例涉及前氯二elline属Soliella Lasley, Klaus & Ng, Citation2015(此处作为Etisinae的一部分处理)，目前包括两个有效物种和三个在近期文献中不断变化的可用名称。这些分类群的有效性只是粗略地讨论过。为了解决物种限制和分布，对数百个标本进行了彻底的形态学检查，包括雄性性腺动物的扫描电镜，以及线粒体标记细胞色素c氧化酶亚基I (COI)的序列数据分析，这些数据来自该属分布的84个样本。确认了在印澳群岛和邻近地区有重叠分布的印度洋和太平洋两种物种的地位。虽然外部形态不可靠，但在性腺形态上发现了一些离散的，尽管轻微的差异，这些结果与“伪隐种”的命名一致。物种形成符合先前发表的异源分化的etisine模型，随后在次生共感上性腺形态发生分化。讨论了这一模式、两种植物的生物地理特征以及“伪隐种”的概念。
{"title":"Revision of the Indo-West Pacific crab genus <i>Soliella</i> (Brachyura: Xanthidae: Etisinae): ‘pseudocryptic species’ and basinal speciation","authors":"Robert M. Lasley, Jose Christopher E. Mendoza, Gustav Paulay","doi":"10.1080/14772000.2023.2249896","DOIUrl":"https://doi.org/10.1080/14772000.2023.2249896","url":null,"abstract":"Etisine crabs are some of the most abundant cryptobionts in Indo-West Pacific coral reef systems. Despite their ecological importance and abundance in museum collections, several recent systematic studies have indicated family- to subspecies-level taxonomic problems. One such case involves the former chlorodielline genus Soliella Lasley, Klaus & Ng, Citation2015 (treated here as part of Etisinae), which currently comprises two valid species and three available names that have been in flux in recent literature. The validity of these taxa has only been cursorily discussed. To resolve species limits and distributions, a thorough morphological examination of hundreds of specimens was conducted, including scanning electron microscopy of male gonopods, along with analysis of sequence data of the mitochondrial marker cytochrome c oxidase subunit I (COI) from 84 exemplars across the distribution of the genus. The status of two species that have Indian Ocean versus Pacific Ocean distributions with overlap in the Indo-Australian Archipelago and adjacent regions is confirmed. While external morphology is not reliable for identification, a few discrete, although slight, differences in gonopod morphology were found, and these results are consistent with a ‘pseudocryptic species’ designation. Speciation conforms to a previously published etisine model of allopatric differentiation followed by subsequent divergence of gonopod morphology upon secondary sympatry. This pattern, the biogeography of the two species and the concept of ‘pseudocryptic species’ are discussed.","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135386939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-11DOI: 10.1080/14772000.2023.2246476
Andriy Utevsky, Serge Utevsky, Joanna M. Cichocka, Aleksander Bielecki, Mario Santoro, Peter Trontelj
The bipolar distribution of fish leeches (Piscicolidae) has been considered and discussed by leech biologists for a long time. All cases of putative bipolar ranges of related taxa that occur in cold and temperate waters of both hemispheres and are absent in the tropics have been morphology-based hypotheses. Here, we present, for the first time, an instance of bipolar distribution substantiated by morphological and molecular data. The latter include the mitochondrial genes 12S rRNA, COI, ND1 and tRNA Leu, and the nuclear 28S rRNA. A new genus and species of Antarctic piscicolids, Austroplatybdellina prodiga, is described. The new leech was part of a Boreal-Arctic monophyletic group that is informally called ‘classic platybdellins’. That clade is the core of the non-monophyletic subfamily Platybdellinae. Austroplatybdellina prodiga gen. nov. sp. nov. was further classified as a member of a monophyletic group along with two Boreal genera, Crangonobdella and Beringobdella, which share a number of systematically important morphological features with its newly described relative. It is hypothesized that the Boreal ancestor of the new leech crossed warm tropical waters and colonized the Antarctic. The colonization was relatively recent as the low genetic distance between A. prodiga and its Boreal sister species suggests. This migration can be viewed as a return of a Boreal descendant of the Antarctic ancestor of Piscicolidae to the area of origin of the entire family, which follows from the basal position of the Antarctic Megaliobdella szidati in the family phylogenetic tree. This evolutionary scenario is reflected in the species epithet of the new leech.https://zoobank.org/urn:lsid:zoobank.org:pub:DA548F19-922A-4B5D-B7F1-4C3AF57B9824https://zoobank.org/urn:lsid:zoobank.org:act:A35C365A-A475-4F3E-B28B-C799F618215Dhttps://zoobank.org/urn:lsid:zoobank.org:act:BCE6411F-E38A-4A99-A726-DE5C33D9D658
{"title":"Return of the prodigal son: morphology and molecular phylogenetic relationships of a new Antarctic fish leech (Hirudinea: Piscicolidae) imply a bipolar biogeographic pattern","authors":"Andriy Utevsky, Serge Utevsky, Joanna M. Cichocka, Aleksander Bielecki, Mario Santoro, Peter Trontelj","doi":"10.1080/14772000.2023.2246476","DOIUrl":"https://doi.org/10.1080/14772000.2023.2246476","url":null,"abstract":"The bipolar distribution of fish leeches (Piscicolidae) has been considered and discussed by leech biologists for a long time. All cases of putative bipolar ranges of related taxa that occur in cold and temperate waters of both hemispheres and are absent in the tropics have been morphology-based hypotheses. Here, we present, for the first time, an instance of bipolar distribution substantiated by morphological and molecular data. The latter include the mitochondrial genes 12S rRNA, COI, ND1 and tRNA Leu, and the nuclear 28S rRNA. A new genus and species of Antarctic piscicolids, Austroplatybdellina prodiga, is described. The new leech was part of a Boreal-Arctic monophyletic group that is informally called ‘classic platybdellins’. That clade is the core of the non-monophyletic subfamily Platybdellinae. Austroplatybdellina prodiga gen. nov. sp. nov. was further classified as a member of a monophyletic group along with two Boreal genera, Crangonobdella and Beringobdella, which share a number of systematically important morphological features with its newly described relative. It is hypothesized that the Boreal ancestor of the new leech crossed warm tropical waters and colonized the Antarctic. The colonization was relatively recent as the low genetic distance between A. prodiga and its Boreal sister species suggests. This migration can be viewed as a return of a Boreal descendant of the Antarctic ancestor of Piscicolidae to the area of origin of the entire family, which follows from the basal position of the Antarctic Megaliobdella szidati in the family phylogenetic tree. This evolutionary scenario is reflected in the species epithet of the new leech.https://zoobank.org/urn:lsid:zoobank.org:pub:DA548F19-922A-4B5D-B7F1-4C3AF57B9824https://zoobank.org/urn:lsid:zoobank.org:act:A35C365A-A475-4F3E-B28B-C799F618215Dhttps://zoobank.org/urn:lsid:zoobank.org:act:BCE6411F-E38A-4A99-A726-DE5C33D9D658","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135980660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-23DOI: 10.1080/14772000.2023.2246472
Irina A. Ekimova, Ekaterina Nikitenko, Maria V. Stanovova, Dimitry M. Schepetov, Tatiana I. Antokhina, Manuel AntÓnio E. Malaquias, ÁNgel ValdÉs
AbstractOnchidoris muricata (Gastropoda: Nudibranchia: Onchidorididae) is a well-known nudibranch species, which has a wide amphiboreal range confirmed by molecular data. However, O. muricata shows a high degree of variation in external morphology among distant populations, which may indicate the presence of cryptic diversity within this species. There are also two closely related species with an unconfirmed taxonomic status, which were recently described from the northwestern Pacific based on morphological data. In this paper we study the taxonomic status and population structure of O. muricata based on an integrative approach combining morphological and molecular data and using O. muricata as a model we explore issues of boreal marine fauna connectivity and glaciation-driven isolation. The external morphology, spicule composition, and features of the buccal armature and the reproductive system were studied using light microscopy, scanning electron microscopy and mCT scan technology. The molecular study included various population genetic analyses as well as divergence time estimation and ancestral area reconstruction analyses. Onchidoris muricata represents a true amphiboreal species, which shows a high degree of heterogeneity in morphological characters, especially in the radular morphology and in features of the reproductive system. Our new data question the validity of the North-West Pacific species O. macropompa and O. pavli as the morphology of both these species fall within the phenotypic diversity of O. muricata. Although our sampling does not include the type localities of these two species, the observed morphological variability in O. muricata and the lack of molecular data for the North Pacific species O. macropompa and O. pavli suggest the latter two species are in fact part of O. muricata morphological diversity. Phylogeographic analyses indicate a genetic separation of the North Pacific and North Atlantic-Arctic populations of O. muricata, suggesting restricted gene flow between these areas. We show that this divergence may be a result of glacial cycles during the late Pleistocene, which were a key factor in the reduction of gene flow across the Arctic Ocean. Our molecular results also suggest that the White Sea population experienced a bottleneck event during the last Glacial Maximum.Key words: ArcticMolluscaNorth-West Pacificradulaspecies conceptspecies delimitationspicule complex AcknowledgmentsWe are deeply grateful to all friends and colleagues who kindly collected and supplied specimens for this study: WSBS Dive Team, especially A.A. Semenov and A. Mikhlina; Yu.V. Deart, Egersund Dive Team 2019, Tine Kinn Kvamme, Nils Aukan, Erling Svensen, Anders Schouw, Ole Meldahl and Justine Sigwald. We want to express our special gratitude to Andrey Shpatak, who kindly hosted us during numerous field trips to the Sea of Japan and supplied diving facilities, and also shared with us his beautiful photos and extensive observations on nudibr
摘要:腹足纲:裸鳃纲:盘尾纲:盘尾纲)是一种众所周知的裸鳃纲物种，具有广泛的两栖活动范围。然而，远缘居群间的外形态差异很大，这可能表明该物种内部存在隐多样性。还有两个近缘种，其分类地位未经证实，最近在西北太平洋根据形态学资料被描述。本文基于形态学和分子数据相结合的综合方法，研究了黄腹鱼的分类地位和种群结构，并以黄腹鱼为模型，探讨了北方海洋动物连通性和冰川驱动隔离问题。采用光镜、扫描电镜和mCT扫描技术研究了颊枢和生殖系统的外部形态、针状组成和特征。分子研究包括各种群体遗传分析、分化时间估计和祖先区域重建分析。muricata Onchidoris是一种真正的两栖动物，在形态特征上，特别是在根状形态和生殖系统特征上表现出高度的异质性。我们的新数据质疑了西北太平洋物种O. macropompa和O. pavli的有效性，因为这两个物种的形态都属于O. muricata的表型多样性。尽管我们的采样不包括这两个物种的类型位置，但观察到的muricata的形态变异以及北太平洋物种O. macropompa和O. pavli的分子数据的缺乏表明后两个物种实际上是O. muricata形态多样性的一部分。系统地理学分析表明，北太平洋和北大西洋-北极地区的村田花种群存在遗传分离，表明这些地区之间的基因流动有限。我们表明，这种差异可能是晚更新世期间冰川旋回的结果，这是北冰洋基因流动减少的关键因素。我们的分子结果还表明，白海种群在末次盛冰期经历了一个瓶颈事件。关键词:北极软体动物，西北太平洋，物种概念，物种划分，微粒群，感谢所有为本研究收集和提供标本的朋友和同事:WSBS潜水团队，特别是A.A. Semenov和a.m ikhlina;Yu.V。亲爱的，2019年Egersund潜水队，Tine Kinn Kvamme, Nils Aukan, Erling Svensen, Anders Schouw, Ole Meldahl和Justine Sigwald。我们要特别感谢Andrey Shpatak，在我们多次前往日本海的实地考察中，他热情地接待了我们，并提供了潜水设备，还与我们分享了他对日本海裸鳃动物生态的美丽照片和广泛观察。人们感谢Cessa Rauch对来自挪威的标本进行测序。我们还要感谢Valentina Tambovtseva(俄罗斯科学院发育生物学研究所)在桑格测序方面的帮助。衷心感谢Natalya N. Shunatova博士和Valeria Khabibulina (SPbU)在鉴定寄主苔藓虫方面所提供的宝贵帮助。光学显微镜和分子研究使用了MSU无脊椎动物学系的设备，电子显微镜研究使用了罗蒙诺索夫莫斯科国立大学共享设施中心的电子显微镜实验室的设备，该中心由路透社基金会教育和科学部以及MSU N.A. Pertsov白海生物站联合使用中心赞助。Sanger测序采用中国科学院发育生物学研究所核心中心设备进行。本研究是在俄罗斯联邦政府对罗蒙诺索夫莫斯科国立大学的国家命令科学项目框架内进行的，项目编号为122012100155-8。20-74-10012用于在俄罗斯水域采集样品，进行形态和分子分析。这项工作中使用的几个样本是在“挪威南部的海蛞蝓:多样性，条形码和入侵物种”项目中获得的，该项目由挪威分类学倡议，Artsdatabanken项目资助。812038号。披露声明作者未报告潜在的利益冲突。补充材料本文的补充材料可以在这里访问:https://dx.doi.org/10.1080/14772000.2023.2246472.Associate编辑:Dr Barna Pall-Gergely
{"title":"Unity in diversity: morphological and genetic variability, integrative systematics, and phylogeography of the widespread nudibranch mollusc <i>Onchidoris muricata</i>","authors":"Irina A. Ekimova, Ekaterina Nikitenko, Maria V. Stanovova, Dimitry M. Schepetov, Tatiana I. Antokhina, Manuel AntÓnio E. Malaquias, ÁNgel ValdÉs","doi":"10.1080/14772000.2023.2246472","DOIUrl":"https://doi.org/10.1080/14772000.2023.2246472","url":null,"abstract":"AbstractOnchidoris muricata (Gastropoda: Nudibranchia: Onchidorididae) is a well-known nudibranch species, which has a wide amphiboreal range confirmed by molecular data. However, O. muricata shows a high degree of variation in external morphology among distant populations, which may indicate the presence of cryptic diversity within this species. There are also two closely related species with an unconfirmed taxonomic status, which were recently described from the northwestern Pacific based on morphological data. In this paper we study the taxonomic status and population structure of O. muricata based on an integrative approach combining morphological and molecular data and using O. muricata as a model we explore issues of boreal marine fauna connectivity and glaciation-driven isolation. The external morphology, spicule composition, and features of the buccal armature and the reproductive system were studied using light microscopy, scanning electron microscopy and mCT scan technology. The molecular study included various population genetic analyses as well as divergence time estimation and ancestral area reconstruction analyses. Onchidoris muricata represents a true amphiboreal species, which shows a high degree of heterogeneity in morphological characters, especially in the radular morphology and in features of the reproductive system. Our new data question the validity of the North-West Pacific species O. macropompa and O. pavli as the morphology of both these species fall within the phenotypic diversity of O. muricata. Although our sampling does not include the type localities of these two species, the observed morphological variability in O. muricata and the lack of molecular data for the North Pacific species O. macropompa and O. pavli suggest the latter two species are in fact part of O. muricata morphological diversity. Phylogeographic analyses indicate a genetic separation of the North Pacific and North Atlantic-Arctic populations of O. muricata, suggesting restricted gene flow between these areas. We show that this divergence may be a result of glacial cycles during the late Pleistocene, which were a key factor in the reduction of gene flow across the Arctic Ocean. Our molecular results also suggest that the White Sea population experienced a bottleneck event during the last Glacial Maximum.Key words: ArcticMolluscaNorth-West Pacificradulaspecies conceptspecies delimitationspicule complex AcknowledgmentsWe are deeply grateful to all friends and colleagues who kindly collected and supplied specimens for this study: WSBS Dive Team, especially A.A. Semenov and A. Mikhlina; Yu.V. Deart, Egersund Dive Team 2019, Tine Kinn Kvamme, Nils Aukan, Erling Svensen, Anders Schouw, Ole Meldahl and Justine Sigwald. We want to express our special gratitude to Andrey Shpatak, who kindly hosted us during numerous field trips to the Sea of Japan and supplied diving facilities, and also shared with us his beautiful photos and extensive observations on nudibr","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135520472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-09DOI: 10.1080/14772000.2023.2237033
Lukáš Pola, Doubravka Velenská, Kseniia Marianna Prondzynska, Vojtěch Hejduk, Aleš Zíka, Tomáš Winkelhöfer, M. A. Baker, Z. Amr, J. Šmíd
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Pub Date : 2023-07-24DOI: 10.1080/14772000.2023.2228326
G. Perina, A. Camacho, M. Danks, N. White, M. Guzik
{"title":"Two new species of Atopobathynella (Parabathynellidae, Bathynellacea) from the Pilbara region, Australia","authors":"G. Perina, A. Camacho, M. Danks, N. White, M. Guzik","doi":"10.1080/14772000.2023.2228326","DOIUrl":"https://doi.org/10.1080/14772000.2023.2228326","url":null,"abstract":"","PeriodicalId":54437,"journal":{"name":"Systematics and Biodiversity","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44109815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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