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The Unexplored Biodiversity of ‘Glacier Fleas’ (Hexapoda: Collembola): Taxonomy, Distribution and Ecology in the European Alps and Apennines
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2025-04-06 DOI: 10.1155/jzs/1616350
Barbara Valle, Giovanni Barbon, Claudio Cucini, Francesco Nardi, Roberto Ambrosini, Sara Boschi, Jakub Buda, Gentile Francesco Ficetola, Francesco Frati, Ľubomír Kováč, Silvio Marta, Riccardo Scotti, Virginia Toscano Rivalta, Anaïs Zimmer, Mauro Gobbi, Marco Caccianiga

Springtails (Hexapoda: Collembola) are unique among Alpine arthropods for including cryophilic species, able to live in contact with glacial ice, the so-called ‘glacier fleas’. Despite being historically recorded, their taxonomy and distribution are largely unknown. In this article, we present the first comprehensive study of ice-dwelling springtails (family Isotomidae) of the European Alps and Apennines. Morphological and molecular analyses of two mitochondrial genes (cox1 and 16S) were performed after an extensive field sampling across 48 European sites. Five new species were identified and described on the Alps: Desoria orobica sp. nov., Vertagopus glacialis sp. nov., V. psychrophilus sp. nov., V. glacieinigrae sp. nov. and V. fradustaensis sp. nov., together with the already known D. saltans and V. alpinus. The evidence for two further new species was also reported, with the first occurrence of Gnathisotoma bicolor for the Alpine chain. Desoria calderonis occurs on the only glacier of the Apennines. Among the new species, V. glacialis and V. psychrophilus exhibit a wide range distribution, while the other species show a narrow endemic distribution. The study highlighted the unexplored diversity of Alpine ‘glacier fleas’ and their ecological and biogeographic interest, together with the conservation concern in the context of the present warming cycle.

{"title":"The Unexplored Biodiversity of ‘Glacier Fleas’ (Hexapoda: Collembola): Taxonomy, Distribution and Ecology in the European Alps and Apennines","authors":"Barbara Valle,&nbsp;Giovanni Barbon,&nbsp;Claudio Cucini,&nbsp;Francesco Nardi,&nbsp;Roberto Ambrosini,&nbsp;Sara Boschi,&nbsp;Jakub Buda,&nbsp;Gentile Francesco Ficetola,&nbsp;Francesco Frati,&nbsp;Ľubomír Kováč,&nbsp;Silvio Marta,&nbsp;Riccardo Scotti,&nbsp;Virginia Toscano Rivalta,&nbsp;Anaïs Zimmer,&nbsp;Mauro Gobbi,&nbsp;Marco Caccianiga","doi":"10.1155/jzs/1616350","DOIUrl":"https://doi.org/10.1155/jzs/1616350","url":null,"abstract":"<div>\u0000 <p>Springtails (Hexapoda: Collembola) are unique among Alpine arthropods for including cryophilic species, able to live in contact with glacial ice, the so-called ‘glacier fleas’. Despite being historically recorded, their taxonomy and distribution are largely unknown. In this article, we present the first comprehensive study of ice-dwelling springtails (family Isotomidae) of the European Alps and Apennines. Morphological and molecular analyses of two mitochondrial genes (<i>cox1</i> and <i>16S</i>) were performed after an extensive field sampling across 48 European sites. Five new species were identified and described on the Alps: <i>Desoria orobica</i> sp. nov., <i>Vertagopus glacialis</i> sp. nov., <i>V. psychrophilus</i> sp. nov., <i>V. glacieinigrae</i> sp. nov. and <i>V. fradustaensis</i> sp. nov., together with the already known <i>D. saltans</i> and <i>V. alpinus</i>. The evidence for two further new species was also reported, with the first occurrence of <i>Gnathisotoma bicolor</i> for the Alpine chain. <i>Desoria calderonis</i> occurs on the only glacier of the Apennines. Among the new species, <i>V. glacialis</i> and <i>V. psychrophilus</i> exhibit a wide range distribution, while the other species show a narrow endemic distribution. The study highlighted the unexplored diversity of Alpine ‘glacier fleas’ and their ecological and biogeographic interest, together with the conservation concern in the context of the present warming cycle.</p>\u0000 </div>","PeriodicalId":54751,"journal":{"name":"Journal of Zoological Systematics and Evolutionary Research","volume":"2025 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jzs/1616350","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143787144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mushroom Soft Corals (Octocorallia: Coralliidae) From Seamounts in the Tropical Northwestern Pacific: Morphology and Phylogenetic Analysis Reveal a New Genus and Six New Species
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2025-03-30 DOI: 10.1155/jzs/4177670
Yang Li, Junyuan Li, Kuidong Xu

Mushroom soft corals in the subfamily Anthomastinae are among the most remarkable octocorals found in the deep sea, characterized by their capitate or mushroom-shaped red colonies and large autozooids. To date, their species diversity remains largely unknown due to limited research, and their phylogenetic relationships have yet to be explored. Based on samples collected from four seamounts in the tropical Northwestern Pacific, we establish a new genus and six new species within Anthomastinae: Neoanthomastus stellatus gen. et sp. nov., Neoanthomastus elongatus gen. et sp. nov., Anthomastus sphaericus sp. nov., Anthomastus tongi sp. nov., Pseudoanthomastus ornatus sp. nov., and Pseudoanthomastus applanatus sp. nov. We transfer four species of Anthomastus with the siphonozooids extending into the stalk to the new genus Neoanthomastus, and four additional species of Anthomastus to Pseudoanthomastus. A dichotomous key to all five known genera and 43 species of Anthomastinae is provided. Meanwhile, we utilize the concatenated nucleotides of 13 mitochondrial protein-coding genes (PCGs), the full-length coding regions of the mitochondrial MutS gene (mtMutS) and the barcodes of partial mtMutS to elucidate the phylogenetic relationships among all the five genera (Anthomastus, Bathyalcyon, Heteropolypus, Pseudoanthomastus, and Neoanthomastus gen. nov.) and available species of Anthomastinae. The phylogenetic trees constructed from the three types of sequences suggest a hierarchical relationship where Neoanthomastus gen. nov. and Pseudoanthomastus form a clade that clusters with Bathyalcyon, which in turn with Heteropolypus, and finally with Anthomastus, all with high nodal supports. We also identify a second species in octocorals that lack the unique mtMutS. The study reveals a high diversity of mushroom soft corals and underscores the need for further systematic and zoogeographic research.

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引用次数: 0
Structure and Evolution of the uqcrfs1 Gene in Western Palearctic Water Frogs (Genus Pelophylax) and Implications for Systematics of Eastern Mediterranean Species
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2025-03-27 DOI: 10.1155/jzs/7457173
Çiğdem Akın Pekşen

The Rieske protein, encoded by the nuclear uqcrfs1 gene, is an essential subunit of the cytochrome bc1 complex involved in electron transfer. Despite its vital function, studies on the structure and evolution of the uqcrfs1 gene are limited. In particular, data on the fine-scale evolution of the uqcrfs1 in the context of speciation and adaptation are lacking. Eastern Mediterranean water frogs (genus Pelophylax) are an ideal model for studying such evolutionary processes at the molecular level, as they comprise several closely related lineages with different degrees of genetic and organismal divergence. Based on comprehensive sequence data of 137 frogs from 106 populations, including Mediterranean frogs as well as frogs from Europe and Central Asia, the spatial distribution of uqcrfs1 alleles was mapped and their genealogical relationships analyzed. In addition, the structure of the gene was investigated using genomic and transcriptomic data from Pelophylax lessonae. The uqcrfs1 gene consists of two exons. The length of coding sequence and its corresponding protein sequence is 807 nucleotides and 268 amino acids, respectively. The GC content and the G/C-ending codons of the gene are about 59.9% and 75.37%. The uqcrfs1 gene has a core promoter type similar to that of widely expressed housekeeping genes, with GC-rich blocks in the regulatory 5’ region, and contains many dispersed conserved motifs for transcription initiation. Genealogical analysis of the uqcrfs1 sequences revealed 10 allelic groups in the Eastern Mediterranean region. While the position of some allelic groups and the number of subgroups in the uqcrfs1 gene tree are somewhat different, they largely support the results of previous nuclear and mitochondrial genealogical studies. This gene is therefore an effective marker for determining the origin of different water frog species and lineages, including hybrids.

由核 uqcrfs1 基因编码的 Rieske 蛋白是细胞色素 bc1 复合物的一个重要亚基,参与电子传递。尽管uqcrfs1基因具有重要功能,但对其结构和进化的研究却十分有限。尤其是缺乏有关uqcrfs1在物种演化和适应过程中的精细演化的数据。东地中海水蛙(Pelophylax 属)是在分子水平上研究此类进化过程的理想模型,因为它们由几个具有不同遗传和生物分化程度的密切相关品系组成。基于来自 106 个种群(包括地中海蛙类以及欧洲和中亚蛙类)的 137 种蛙类的综合序列数据,绘制了 uqcrfs1 等位基因的空间分布图,并分析了它们的系谱关系。此外,还利用 Pelophylax lessonae 的基因组和转录组数据研究了该基因的结构。uqcrfs1基因由两个外显子组成。编码序列及其相应的蛋白质序列长度分别为 807 个核苷酸和 268 个氨基酸。该基因的 GC 含量和 G/C 末端密码子含量分别约为 59.9% 和 75.37%。uqcrfs1基因的核心启动子类型与广泛表达的看家基因相似,在调控5'区有富含GC的区块,并含有许多分散的保守转录启动基序。对 uqcrfs1 序列的系谱分析显示,东地中海地区有 10 个等位基因群。虽然uqcrfs1基因树中一些等位基因群的位置和亚群的数量有些不同,但它们在很大程度上支持了之前核和线粒体系谱研究的结果。因此,该基因是确定不同水蛙物种和品系(包括杂交种)起源的有效标记。
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引用次数: 0
Integrative Taxonomy of Ourapteryx Leach (Geometridae, Lepidoptera) Based on Molecular and Morphological Evidences
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2025-02-27 DOI: 10.1155/jzs/5450629
Rui Cheng, Nan Jiang, A’Rong Luo, Qingsong Zhou, Xiaoye Mi, Chaodong Zhu, Hongxiang Han

Ourapteryx is widely distributed in the Palearctic and Oriental regions, with the highest species diversity found in China. As of 2024, 95 described species have been recorded globally; however, no comprehensive revision of this genus has been published. Identifying Ourapteryx species based solely on wing patterns is challenging due to their extreme similarity, often leading to frequent misidentifications and the oversight of cryptic species. In this study, we utilized 68 morphological species, along with 1050 COI sequences, to develop an integrative taxonomy for Ourapteryx. This taxonomy integrates morphological, molecular, distributional, and ecological evidences. Our findings identified nine candidate species (labeled as sp1–sp7, O. horishana and O. brachycerca), increasing the total number of recognized species from 68 to 77. Using this updated checklist, we compared four molecular delimitation methods against the outcomes of morphological taxonomy. The analysis indicated that a 2% threshold produced the highest efficiency. Additionally, we explored the reasons behind morpho-molecular discordance and the presence of hidden species. Our study underscores the importance and reliability of integrative taxonomy, which relies on multiple lines of evidence for accurate species identification and classification.

{"title":"Integrative Taxonomy of Ourapteryx Leach (Geometridae, Lepidoptera) Based on Molecular and Morphological Evidences","authors":"Rui Cheng,&nbsp;Nan Jiang,&nbsp;A’Rong Luo,&nbsp;Qingsong Zhou,&nbsp;Xiaoye Mi,&nbsp;Chaodong Zhu,&nbsp;Hongxiang Han","doi":"10.1155/jzs/5450629","DOIUrl":"https://doi.org/10.1155/jzs/5450629","url":null,"abstract":"<div>\u0000 <p><i>Ourapteryx</i> is widely distributed in the Palearctic and Oriental regions, with the highest species diversity found in China. As of 2024, 95 described species have been recorded globally; however, no comprehensive revision of this genus has been published. Identifying <i>Ourapteryx</i> species based solely on wing patterns is challenging due to their extreme similarity, often leading to frequent misidentifications and the oversight of cryptic species. In this study, we utilized 68 morphological species, along with 1050 COI sequences, to develop an integrative taxonomy for <i>Ourapteryx</i>. This taxonomy integrates morphological, molecular, distributional, and ecological evidences. Our findings identified nine candidate species (labeled as sp1–sp7, <i>O. horishana</i> and <i>O. brachycerca</i>), increasing the total number of recognized species from 68 to 77. Using this updated checklist, we compared four molecular delimitation methods against the outcomes of morphological taxonomy. The analysis indicated that a 2% threshold produced the highest efficiency. Additionally, we explored the reasons behind morpho-molecular discordance and the presence of hidden species. Our study underscores the importance and reliability of integrative taxonomy, which relies on multiple lines of evidence for accurate species identification and classification.</p>\u0000 </div>","PeriodicalId":54751,"journal":{"name":"Journal of Zoological Systematics and Evolutionary Research","volume":"2025 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jzs/5450629","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generic Revision of the Southeast and East Asian Torrent Carp Subfamily Acrossocheilinae (Pisces: Teleostei) With Description of Three New Genera and a New Species From Vietnam
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2025-01-09 DOI: 10.1155/jzs/8895501
Huy Duc Hoang, Nian-Hong Jang-Liaw, Hung Manh Pham, Ngan Trong Tran, Jean-Dominique Durand, Tao Dinh Nguyen, John Pfeiffer, Lawrence M. Page

Molecular data from 35 of the 50 Acrossocheilinae species suggest that the species-level diversity in the subfamily has been overestimated, likely due to inadequate taxon and geographic sampling and reliance on morphological characters that vary intraspecifically. Three new genera, one resurrected genus, two resurrected species, and one new species are diagnosed and described herein. Nine synonyms of three valid species of Acrossocheilinae are recognized from the Yangtze, Xijiang, Song Hong, Annamite, and Mekong ecoregions in East and Southeast Asia. Thirty-two valid and six putative new species are indicated by molecular data and a key to the genera is provided. As more molecular and morphological data become available, additional taxonomic changes in this widespread and generally poorly known subfamily are likely.

{"title":"Generic Revision of the Southeast and East Asian Torrent Carp Subfamily Acrossocheilinae (Pisces: Teleostei) With Description of Three New Genera and a New Species From Vietnam","authors":"Huy Duc Hoang,&nbsp;Nian-Hong Jang-Liaw,&nbsp;Hung Manh Pham,&nbsp;Ngan Trong Tran,&nbsp;Jean-Dominique Durand,&nbsp;Tao Dinh Nguyen,&nbsp;John Pfeiffer,&nbsp;Lawrence M. Page","doi":"10.1155/jzs/8895501","DOIUrl":"https://doi.org/10.1155/jzs/8895501","url":null,"abstract":"<div>\u0000 <p>Molecular data from 35 of the 50 Acrossocheilinae species suggest that the species-level diversity in the subfamily has been overestimated, likely due to inadequate taxon and geographic sampling and reliance on morphological characters that vary intraspecifically. Three new genera, one resurrected genus, two resurrected species, and one new species are diagnosed and described herein. Nine synonyms of three valid species of Acrossocheilinae are recognized from the Yangtze, Xijiang, Song Hong, Annamite, and Mekong ecoregions in East and Southeast Asia. Thirty-two valid and six putative new species are indicated by molecular data and a key to the genera is provided. As more molecular and morphological data become available, additional taxonomic changes in this widespread and generally poorly known subfamily are likely.</p>\u0000 </div>","PeriodicalId":54751,"journal":{"name":"Journal of Zoological Systematics and Evolutionary Research","volume":"2025 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/jzs/8895501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phylogeographic Structure of Five-Toed Jerboas of the Genus Scarturus (Dipodoidea and Allactaginae) With Taxonomic Clarification in Türkiye 图尔基耶五趾鼬属(双足目和啮齿目)的系统地理结构及分类学澄清
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2024-12-13 DOI: 10.1155/jzs/8123686
Gül Olgun Karacan, Reyhan Çolak, Nuri Yiğit, İrfan Kandemir, Şakir Önder Özkurt, Ercüment Çolak

Understanding the genetic structure and phylogeographic patterns of Scarturus species is crucial for accurately delineating their taxonomic status and informing conservation strategies. This study explores the genetic differentiation of Scarturus williamsi, S. aulacotis, and S. elater species complex across Turkish populations by analyzing mitochondrial (Cytb, 12S rRNA, and 16S rRNA) and nuclear (IRBP) gene sequences. Our phylogenetic analyses have firmly established the monophyly and distinct species status of S. williamsi and S. aulacotis (formerly known as S. euphraticus), challenging previous subspecies classifications. Within S. williamsi, we identified five distinct lineages from Cytb sequences, illustrating a complex population structure shaped by geographical and ecological factors. Notably, the Niğde population emerged as a unique and ancient lineage, likely influenced by historical isolation. Our findings further indicate that S. aulacotis encompasses two divergent lineages, one spanning Syrian samples and the other Turkish and Iranian samples, both now classified under the revised taxonomy of S. aulacotis. Analysis of the S. elater species complex unveiled three distinct subclades, with the Turkish population aligning closely with Iranian and Armenian samples, identified as S. indicus aralychensis within the S. indicus superspecies.

了解赤足属植物的遗传结构和系统地理模式,对准确描述赤足属植物的分类地位和制定保护策略具有重要意义。本研究通过分析线粒体(Cytb、12S rRNA和16S rRNA)和核(IRBP)基因序列,探讨了土耳其种群中Scarturus williamsi、S. aulacotis和S. elater物种复合体的遗传分化。我们的系统发育分析已经确定了S. williamsi和S. aulacotis(以前称为S. euphraticus)的单系和独特的物种地位,挑战了以前的亚种分类。在S. williamsi中,我们从Cytb序列中鉴定出5个不同的谱系,说明了地理和生态因素塑造的复杂种群结构。值得注意的是,Niğde人口作为一个独特而古老的血统出现,可能受到历史隔离的影响。我们的研究结果进一步表明,S. aulacotis包含两个不同的谱系,一个跨越叙利亚样本,另一个跨越土耳其和伊朗样本,两者现在都归在S. aulacotis的修订分类法下。对S. elater物种复合物的分析揭示了三个不同的亚分支,土耳其种群与伊朗和亚美尼亚样本密切一致,被确定为S. indicus aralychensis,属于S. indicus超种。
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引用次数: 0
Integrative Approach for the Identification and Delimitation of Orthops Species (Heteroptera, Miridae, and Mirinae) in the Palearctic 古北缘直足类(异翅目、盲足科、盲足科)鉴定与划分的综合方法
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2024-12-03 DOI: 10.1155/jzs/5987677
Polina A. Dzhelali, Anna A. Namyatova

Orthops is a widely distributed plant bug genus comprising 35 species. Its nominotypical subgenus includes seven species mostly known from the Palearctic, and four of them are widely distributed. Most of them live in sympatry having only little morphological differences. The species limits have never been tested using the molecular data. The aim of this work is to test whether currently defined species represent monophyletic lineages and to find their interrelationships using an integrative approach. Morphological studies on external characters and male and female genitalia were performed. The molecular studies were based on the mitochondrial (cytochrome c oxidase subunit I [COI] and 12S ribosomal RNA [rRNA]) and nuclear (internal transcribed spacer I [ITS1] and calcium ATPase [Ca-ATPase]) markers and included comparison of the intra- and interspecific distances, species delimitation (ABGD, BPP, bGMYC, PTP, and bPTP), and phylogenetic analyses. All markers showed interspecific differences, and COI was the most variable. It was found that all species differed from each other morphologically, and the most reliable character complexes were parameres and female genitalia. In most analyses, Orthops kalmii and O. campestris were monophyletic. Orthops basalis formed a clade in most phylogenetic trees. Most of the species delimitation analyses confirmed the status of those three species. Orthops scutellatus was split into two clades, Palearctic and North American, which was also confirmed by the species delimitation analyses. Those two groups differed in parameres. Orthops campestris and O. scutellatus form a clade in all analyses, and O. basalis forms a clade with O. kalmii in most analyses.

直足虫是一个分布广泛的植物昆虫属,共有35种。其命名典型亚属包括7种,大多来自古北,其中4种分布广泛。它们大多数生活在共栖中,只有很小的形态差异。物种限制从未使用分子数据进行测试。这项工作的目的是测试当前定义的物种是否代表单系谱系,并使用综合方法找到它们的相互关系。对其外形性状和雌雄生殖器进行了形态学研究。分子研究基于线粒体(细胞色素c氧化酶亚基I [COI]和12S核糖体RNA [rRNA])和核(内转录间隔物I [ITS1]和钙atp酶[ca - atp酶])标记,包括种内和种间距离的比较,物种划分(ABGD, BPP, bGMYC, PTP和bPTP),以及系统发育分析。所有标记物均表现出种间差异,其中COI变化最大。研究发现,所有物种在形态上都存在差异,最可靠的特征复合体是参数和雌性生殖器。在大多数分析中,kalmii和O. campestris是单系的。在大多数系统发育树中,基底直男是一个分支。多数种界分析证实了这三个种的地位。直立猿人被划分为古北支和北美支两个分支,这一点也得到了种界分析的证实。这两组在参数上有所不同。在所有的分析中,直立猿人与scutellatus形成一个分支,而在大多数分析中,基底猿人与kalmii形成一个分支。
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引用次数: 0
Morphology, Phylogeny, and Evolution of the Rarely Known Genus Admetella McIntosh, 1885 (Annelida, Polynoidae) with Recognition of Four New Species from Western Pacific Seamounts 鲜为人知的 Admetella McIntosh, 1885 属(无脊椎动物,多形目)的形态学、系统发育和进化,以及来自西太平洋海山的四个新物种的确认
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2024-10-08 DOI: 10.1155/2024/9886076
Xuwen Wu, Qi Kou, Yanan Sun, Wenquan Zhen, Kuidong Xu

The polynoid genus Admetella constitutes a deep-sea assemblage of polychaetes, notable for their large bodies adorned with antennal scales positioned dorsally to the bases of lateral antennae. Furthermore, the genus exhibits swimming proficiencies facilitated by elongated parapodia and flattened chaetae. Despite the frequent encounters with Admetella members during various deep-sea explorations, a substantial gap in our comprehension of their diversity, phylogeny, and evolutionary trajectories still exists. Our thorough morphological and phylogenetic investigations of specimens obtained from three seamounts located in the tropical western Pacific have unveiled six species belonging to the genus Admetella, four of these being newly identified as Admetella multiseta sp. nov., A. levensteini sp. nov., A. nanhaiensis sp. nov., and A. undulata sp. nov. The other two species of Admetella remain unidentifiable at the species level due to the loss of crucial details. Our phylogenetic analysis, grounded on 13 mitochondrial protein-coding genes and the inclusion of 12S, 16S, 18S, 28S rRNA, and ITS1–ITS2 genes, substantiates the monophyly of Admetella. Admetella is positioned at an intermediate node within the phylogenetic tree, situated between representative shallow-water and deep-sea subfamilies. The independent evolution of antennal scales within Admetella among polynoids constitutes a synapomorphy for this genus. Ancestral state reconstruction (ASR) analyses suggest that deep-sea polynoids evolved from shallow-water ancestors that possessed lateral antennae, which were subsequently lost in members inhabiting extreme marine environments, such as deep-sea hydrothermal vents and anchialine caves. The analysis further implicates that swimming ability independently evolved at least four times within the Polynoidae family.

Admetella 属多毛目多毛类是一个深海多毛类集合体,其显著特点是体型庞大,背侧至侧触角基部装饰有触角鳞片。此外,该属凭借拉长的副鳃和扁平的链节表现出游泳能力。尽管在各种深海探索中经常遇到 Admetella 成员,但我们对其多样性、系统发育和进化轨迹的了解仍然存在很大差距。我们对从位于热带西太平洋的三座海山获得的标本进行了深入的形态学和系统发生学研究,发现了属于 Admetella 属的六个物种,其中四个物种被新鉴定为 Admetella multiseta sp.由于关键细节的缺失,Admetella 的另外两个种在物种水平上仍无法识别。我们的系统发育分析基于 13 个线粒体蛋白编码基因,包括 12S、16S、18S、28S rRNA 和 ITS1-ITS2 基因,证实了 Admetella 的单系性。Admetella 位于系统发生树的中间节点,介于具有代表性的浅水亚科和深海亚科之间。Admetella 的触角鳞片在多刺类中的独立进化构成了该属的同系异形。祖先状态重建(ASR)分析表明,深海多孔动物是从拥有侧触角的浅水祖先进化而来的,而在深海热液喷口和锚系洞穴等极端海洋环境中栖息的成员随后失去了侧触角。该分析进一步表明,游泳能力在波罗的海科内至少独立进化了四次。
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引用次数: 0
Association between Genetic Admixture and Morphological Patterns in a Hybrid Zone between the Two Iberian Vipers, Vipera aspis and V. latastei 两种伊比利亚蝰蛇(Vipera aspis 和 V. latastei)杂交区的遗传混杂与形态模式之间的关系
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2024-09-05 DOI: 10.1155/2024/3800363
Inês Freitas, Guillermo Velo-Antón, Antigoni Kaliontzopoulou, Óscar Zuazo, Fernando Martínez-Freiría

Understanding how hybridization influences the morphology and fitness of hybrids is essential for studying adaptive evolution and ecological speciation. Secondary contact zones, where separately evolving populations meet and hybridize, offer valuable insights into the evolutionary processes driving speciation and provide an excellent system to address these questions. In this study, we investigate patterns of morphological and genetic variation of two congeneric viper species, Vipera aspis and V. latastei, across a contact zone in northern Spain (Oja-Tirón), where vipers with mixed morphology are often detected, but genetic studies addressing hybridization and relating patterns of genetic and morphological admixture are lacking. Using nine morphological traits (scalation and colouration) and 18 microsatellite markers, we (1) estimated the extent of hybridization, (2) morphologically characterized parental species and hybrids, and (3) evaluated the correlation between patterns of genetic and morphological admixture. Analyses revealed a bimodal hybrid zone with high rate of hybridization (22%) and prevalence of late-generation hybrids (F2 and backcrosses). Morphological analyses differentiated the two parental species, and a positive correlation (r = 0.95) was found between morphological and genetic patterns. The hybrid group displayed on average an intermediate morphology between the parentals, yet morphologically intermediate hybrids were rare in our dataset. Instead, most hybrids resembled the parental species with whom they share most of the genetic background. Notably, the hybrid group exhibited greater morphological variation than the parental groups. Traits with adaptative value, such as ventral scales and dorsal marks, showed significant differences between hybrids and the two parental species. Introgression of these traits may confer ecological advantages to hybrids, enhancing local adaptation. Overall, this study reveals a positive correlation between patterns of morphological and genetic variation across a hybrid zone and provides insights into the phenotypic consequences of hybridization on these viper species.

了解杂交如何影响杂交种的形态和适应性对于研究适应性进化和生态物种分化至关重要。次生接触区是单独进化的种群相遇和杂交的地方,它为了解驱动物种进化的过程提供了宝贵的视角,也为解决这些问题提供了一个极好的系统。在这项研究中,我们调查了西班牙北部接触区(Oja-Tirón)两种同源蝰蛇(Vipera aspis和V. latastei)的形态和遗传变异模式,在该接触区经常发现混合形态的蝰蛇,但缺乏针对杂交以及遗传和形态混杂模式的遗传研究。利用九个形态特征(鳞片和颜色)和 18 个微卫星标记,我们(1)估计了杂交的程度,(2)从形态上确定了亲本和杂交种的特征,(3)评估了遗传和形态混杂模式之间的相关性。分析表明,双峰杂交区杂交率高(22%),晚代杂交种(F2 和回交)普遍。形态学分析区分了两个亲本物种,并发现形态学和遗传模式之间存在正相关(r = 0.95)。杂交群体的平均形态介于亲本之间,但在我们的数据集中,形态介于亲本之间的杂交种并不多见。相反,大多数杂交种都与亲本物种相似,它们与亲本物种有大部分的遗传背景。值得注意的是,杂交种组比亲本组表现出更大的形态差异。具有适应价值的性状,如腹部鳞片和背痕,在杂交种和两个亲本之间表现出显著差异。这些性状的传入可能会给杂交种带来生态优势,增强对当地的适应性。总之,这项研究揭示了杂交区形态和遗传变异模式之间的正相关性,并为这些蝰蛇物种的杂交表型后果提供了深入的见解。
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引用次数: 0
Molecular Systematics and Divergence of Tor and Neolissochilus Fishes (Cypriniforms: Cyprinidae) from Southeast Asia and South China 东南亚和华南托氏鱼和新鲤科鱼(鲤形目:鲤科)的分子系统学和分化
IF 2 2区 生物学 Q3 EVOLUTIONARY BIOLOGY Pub Date : 2024-09-04 DOI: 10.1155/2024/5662867
Ling Wu, Tao Qin, Huy Duc Hoang, Thaung Naing Oo, Xiao-Ai Wang, Xiao-Yong Chen

In Southeast Asia, mahseer fishes, such as the species of Tor and Neolissochilus, are significant native commercial fish. Their phylogeny and categorization have a convoluted history. In this study, the molecular systematics and divergence of Tor and Neolissochilus fishes from Southeast Asia and South China were examined using the partial or complete sequences of four mitochondrial genes (cytochrome oxidase I, cytochrome b, 16S, and ND4). This study substantiated the monophyly of Tor and supported N. benasi as an independent genus. The result supported T. laterivittatus as a synonym of T. sinensis and T. dongnaiensis as a synonym of T. tambra. In addition, we presented the high diversity and species crypticity of these two taxa in Southeast Asia. The divergent time estimation indicated Tor and Neolissochilus species originated in the early Miocene (about 16.73 Ma), and the divergence of the genus Tor and other species of the genus Neolissochilus began at about 12.86 Ma.

在东南亚,鲯鳅(Tor 和 Neolissochilus 种)是重要的本地商业鱼类。它们的系统发育和分类历史错综复杂。本研究利用四个线粒体基因(细胞色素氧化酶 I、细胞色素 b、16S 和 ND4)的部分或完整序列,研究了东南亚和华南地区鲯鳅和霓虹鳅的分子系统学和分化。这项研究证实了 Tor 的单系性,并支持 N. benasi 成为一个独立的属。结果支持 T. laterivittatus 为 T. sinensis 的异名,T. dongnaiensis 为 T. tambra 的异名。此外,我们还发现了这两个类群在东南亚的高度多样性和物种隐蔽性。分歧时间估计表明Tor和Neolissochilus物种起源于中新世早期(约16.73 Ma),Tor属和Neolissochilus属其他物种的分歧始于约12.86 Ma。
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Journal of Zoological Systematics and Evolutionary Research
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