Invertebrate Systematics最新文献

{"title":"A review of Palaemonella (Decapoda: Caridea: Palaemonidae), with clarification of the taxonomic status of Cuapetes americanus, Eupontonia and Vir","authors":"Pavlína Frolová, Eva van der Veer, Charles H. J. M. Fransen, Zdenek Duriš","doi":"10.1071/is23055","DOIUrl":"https://doi.org/10.1071/is23055","url":null,"abstract":"<p>The pantropical genus <i>Palaemonella</i> Dana, 1852 (Caridea: Palaemonidae) currently includes 27 species of free-living and symbiotic marine shrimps. The monophyly of <i>Palaemonella</i> with respect to several closely related genera, however, has been questioned by recent analyses. We tested the monophyly of <i>Palaemonella</i> based on multigene phylogenetic analysis and the genus was revealed to be a paraphyletic assemblage by inclusion of species of the genera <i>Eupontonia</i> Bruce, 1971 and <i>Vir</i> Holthuis, 1952, and two genetic lineages of the western Atlantic <i>Cuapetes americanus</i> (Kingsley, 1878). We recognise one of the latter lineages as the previously described <i>Periclimenes rhizophorae</i> Lebour, 1949. <i>Eupontonia</i> and <i>Vir</i> are synonymised with <i>Palaemonella</i>. We also transfer <i>Cuapetes americanus</i> and <i>Periclimenes rhizophorae</i> to <i>Palaemonella</i>. Species previously assigned to <i>Vir</i> were revised; <i>V. colemani</i> Bruce, 2003, <i>V. orientalis</i> (Dana, 1852), <i>V. philippinensis</i> Bruce &amp; Svoboda, 1984 and <i>V. smiti</i> Fransen &amp; Holthuis, 2007 are regarded as valid species of <i>Palaemonella</i>; <i>Vir longidactylus</i> Marin, 2008 is synonymised with <i>P. smiti</i>; and the status of <i>V. euphyllius</i> Marin &amp; Anker, 2005 remains unresolved. <i>Palaemonella</i> is currently regarded as a taxon with variable states of two main diagnostic characters, i.e. the plesiomorphic mandibular palp (fully reduced in <i>P. americana</i>) and the hepatic tooth (fully reduced in former species of <i>Vir</i> and <i>Eupontonia</i> – evidently due to symbiotic modes of life).</p><p>ZooBank: urn:lsid:zoobank.org:pub:7EEBC655-7EDE-4E46-BCB2-2A3BA16ED7DD</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"29 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140832123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling the relationships among Madrepora Linnaeus, 1758, Oculina Lamark, 1816 and Cladocora Ehrenberg, 1834 (Cnidaria: Anthozoa: Scleractinia)","authors":"Anna M. Addamo, Melinda S. Modrell, Marco Taviani, Annie Machordom","doi":"10.1071/is23027","DOIUrl":"https://doi.org/10.1071/is23027","url":null,"abstract":"<p>Despite the widespread use of integrative taxonomic approaches, many scleractinian coral genera and species remain grouped in polyphyletic families, classified as <i>incertae sedis</i> or simply understudied. Oculinidae Gray, 1847 represents a family for which many taxonomic questions remain unresolved, particularly those related to some of the current genera, such as <i>Oculina</i> Lamark, 1816 or recently removed genera, including <i>Cladocora</i> Ehrenberg, 1834 and <i>Madrepora</i> Linnaeus, 1758. <i>Cladocora</i> is currently assigned to the family Cladocoridae Milne Edwards &amp; Haime, 1857 and a new family, Bathyporidae Kitahara, Capel, Zilberberg &amp; Cairns, 2024, was recently raised to accommodate <i>Madrepora</i>. However, the name Bathyporidae is not valid because this was not formed on the basis of a type genus name. To resolve taxonomic questions related to these three genera, the evolutionary relationships are explored through phylogenetic analyses of 18 molecular markers. The results of these analyses support a close relationship between the species <i>Oculina patagonica</i> and <i>Cladocora caespitosa</i>, indicating that these may belong to the same family (and possibly genus), and highlighting the need for detailed revisions of <i>Oculina</i> and <i>Cladocora</i>. By contrast, a distant relationship is found between these two species and <i>Madrepora oculata</i>, with the overall evidence supporting the placement of <i>Madrepora</i> in the resurrected family Madreporidae Ehrenberg, 1834. This study advances our knowledge of coral systematics and highlights the need for a comprehensive review of the genera <i>Oculina</i>, <i>Cladocora</i> and <i>Madrepora</i>.</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"14 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140831634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular diversity of black corals from the Saudi Arabian Red Sea: a first assessment","authors":"Silvia Vicario, Tullia Isotta Terraneo, Giovanni Chimienti, Davide Maggioni, Fabio Marchese, Sam J. Purkis, Ameer Abdulla Eweida, Mattie Rodrigue, Francesca Benzoni","doi":"10.1071/is23041","DOIUrl":"https://doi.org/10.1071/is23041","url":null,"abstract":"<p>Black corals occur as part of benthic assemblages from shallow to deep waters in all oceans. Despite the importance in many benthic ecosystems, where these act as biodiversity aggregators, antipatharians remain poorly studied, with 75% of the known species occurring below recreational SCUBA diving depth limits. Currently, information regarding the diversity and evolutionary history is limited, with most studies focusing on Hawaii and the South Pacific Ocean. Other regions of the world have received less attention, such as the Red Sea, where only two black coral families and four genera have been recorded. We provide the first analysis of the molecular diversity of black corals in the eastern Gulf of Aqaba and the northern and central Saudi Arabian Red Sea, based on a dataset of 161 antipatharian colonies collected down to 627 m deep. Based on specimen morphology, we ascribed our material to 11 genera belonging to 4 of the 7 known Antipatharia families, i.e. Antipathidae, Aphanipathidae, Myriopathidae and Schizopathidae. The genus level phylogeny of three intergenic mitochondrial regions, the <i>trnW-IGR-nad2</i> (<i>IgrW</i>), <i>nad5-IGR-nad1</i> (<i>IgrN</i>) and <i>cox3-IGR-cox1</i> was reconstructed including previously published material. Overall, we recovered six molecular clades that included exclusively Red Sea sequences, with the highest diversity occurring at mesophotic depths. This study highlights that diversity of black corals in the Red Sea is much higher than previously known, with seven new generic records, suggesting that this basin may be a hotspot for antipatharian diversity as is known for other taxa. Our results recovered unresolved relationships within the order at the familial and generic levels. This emphasises the urgent need for an integration of genomic-wide data with a re-examination of informative morphological features necessary to revise the systematics of the order at all taxonomic levels.</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"90 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140577784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new genus of scutigerid centipede from southern South America with the description of two new species and an updated molecular phylogeny of the myriapod order Scutigeromorpha (Myriapoda: Chilopoda)","authors":"Andrés O. Porta, Gonzalo Giribet","doi":"10.1071/is24006","DOIUrl":"https://doi.org/10.1071/is24006","url":null,"abstract":"<p>Scutigeromorph centipedes are conspicuous, yet often ignored myriapods for which little work has been conducted in southern South America. After examining recent and museum collections from Chile and Argentina, two new species of generic uncertainty were identified. A new genus of scutigerid centipede, <i>Edgethreua</i>, is therefore described with two new species, <i>E. chilensis</i> from Central Chile (type species of the genus) and <i>E. goloboffi</i> from Argentinian Patagonia. The new genus is characterised by the presence of scattered setiform bristles with short paired spines and the absence of simple spinulae and spines on all stomatotergites, the presence of a single spine-bristle in the prefemur of the second maxilla, a patch of cuticular ridges and pores surrounding the sensilla of the proximal labral portion of the epipharynx, the morphology of the sensilla of the distal patch of the hypopharynx and the morphology of the female gonopods. A phylogenetic analysis of the new species using two nuclear ribosomal RNA genes (<i>18S</i> and <i>28S</i> rRNA), two mitochondrial ribosomal RNA genes (<i>12S</i> and <i>16S</i> rRNA) and the mitochondrial protein-encoding gene cytochrome <i>c</i> oxidase subunit <i>I</i> show that the new genus does not cluster with any other described genus of scutigeromorph represented in molecular phylogenies. The data indicate that the new genus is probably sister group to a clade including the genera <i>Lassophora</i>, <i>Ballonema</i> and the subfamily Thereuoneminae, although one analysis suggests a position as sister group to Scutigerinae.</p><p>ZooBank: urn:lsid:zoobank.org:pub:A4D453F3-9031-4E21-84C7-87F16C07AD51</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"52 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140577680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phylogeny of the cestode family Escherbothriidae (Cestoda: Rhinebothriidea) reveals unexpected patterns of association with skate hosts","authors":"V. M. Bueno, B. Trevisan, J. N. Caira","doi":"10.1071/is23056","DOIUrl":"https://doi.org/10.1071/is23056","url":null,"abstract":"<p>The rhinebothriidean tapeworm family Escherbothriidae has recently been expanded to include the genus <i>Ivanovcestus</i>, species of which parasitise arhynchobatid skates. Similarities in morphology and host associations between <i>Ivanovcestus</i> and <i>Semiorbiseptum</i> – a genus yet to be assigned to one of the families in the order Rhinebothriidea – led us to explore the possibility that <i>Semiorbiseptum</i> might also belong in the Escherbothriidae. Morphological similarities with <i>Scalithrium ivanovae</i>, <i>Scalithrium kirchneri</i> and <i>Rhinebothrium scobinae</i>, all of which also parasitise arhynchobatid skates, raised questions regarding the generic placements of these species. In addition, new collections from the skate <i>Sympterygia brevicaudata</i> revealed two new species that morphologically resemble species of <i>Ivanovcestus</i>. A combination of morphological and molecular data were used to assess the generic placement of the newly discovered species and refine our understanding of the membership of the family Escherbothriidae. Sequence data for the D1–D3 region of the <i>28S rDNA</i> gene were generated <i>de novo</i> for 14 specimens of 7 rhinebothriidean species and combined with comparable published data to represent all 6 families in the Rhinebothriidea in the analysis. The phylogenetic tree resulting from maximum likelihood analysis strongly supports the inclusion of the genus <i>Semiorbiseptum</i> in the family Escherbothriidae. Our work also suggests that the skate-hosted species previously assigned to <i>Scalithrium</i> and <i>Rhinebothrium</i> are also members of <i>Semiorbiseptum</i> and that <i>Ivanovcestus</i> is a junior synonym of <i>Semiorbiseptum</i>. Six species are transferred to <i>Semiorbiseptum</i>, bringing the total number of species in the genus to ten. The diagnosis of <i>Semiorbiseptum</i> is amended to accommodate the additional species. A second species in the previously monotypic type genus of the family, <i>Escherbothrium</i>, is described. The diagnosis of the Escherbothriidae is amended to include the new and transferred species. This study underscores the importance of integrating morphological and molecular data in bringing resolution to cestode systematics. We believe our findings provide a robust foundation for future research into the evolutionary history and host associations of cestodes within the order Rhinebothriidea and beyond. These also highlight the importance of expanding our understanding of skate-hosted cestodes.</p><p>ZooBank: urn:lsid:zoobank.org:pub:8052AFCA-5FBD-4430-95F4-0E5E368DEA3D</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"18 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel molecular resources for single-specimen barcoding of enigmatic crustacean y-larvae","authors":"Niklas Dreyer, Jørgen Olesen, Mark J. Grygier, Danny Eibye-Jacobsen, Alexandra S. Savchenko, Yoshihisa Fujita, Gregory A. Kolbasov, Ryuji J. Machida, Benny K. K. Chan, Ferran Palero","doi":"10.1071/is23018","DOIUrl":"https://doi.org/10.1071/is23018","url":null,"abstract":"<p>Despite discovery more than 100 years ago and documented global occurrence from shallow waters to the deep sea, the life cycle of the enigmatic crustacean y-larvae isincompletely understood and adult forms remain unknown. To date, only 2 of the 17 formally described species, all based on larval stages, have been investigated using an integrative taxonomic approach. This approach provided descriptions of the morphology of the naupliar and cyprid stages, and made use of exuvial voucher material and DNA barcodes. To improve our knowledge about the evolutionary history and ecological importance of y-larvae, we developed a novel protocol that maximises the amount of morpho-ecological and molecular data that can be harvested from single larval specimens. This includes single-specimen DNA barcoding and daily imaging of y-nauplii reared in culture dishes, mounting of the last naupliar exuviae on a slide as a reference voucher, live imaging of the y-cyprid instar that follows, and fixation, DNA extraction, amplification and sequencing of the y-cyprid specimen. Through development and testing of a suite of new primers for both nuclear and mitochondrial protein-coding and ribosomal genes, we showcase how new sequence data can be used to estimate the phylogeny of Facetotecta. We expect that our novel procedure will help to unravel the complex systematics of y-larvae and show how these fascinating larval forms have evolved. Moreover, we posit that our protocols should work on larval specimens from a diverse array of moulting marine invertebrate taxa.</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"9 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140108060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phylogenomics of endemic Australian Ulopinae (Hemiptera: Cicadomorpha: Cicadellidae)","authors":"Olivia Evangelista, Nikolai Tatarnic, Keith Bayless","doi":"10.1071/is23035","DOIUrl":"https://doi.org/10.1071/is23035","url":null,"abstract":"<p>Ulopinae is a distinctive subfamily of leafhoppers that is widely distributed across the Afrotropical, Palearctic, Indomalayan and Australasian regions. The ulopine fauna of Australia is entirely endemic and includes two tribes of striking appearance, the Ulopini and Cephalelini. Knowledge of these groups is fragmentary and in many instances, no information is available beyond original descriptions. We assess the monophyly, phylogenetic placement and species-level diversity of the Ulopini genus <i>Austrolopa</i>. Phylogenetic analyses based on sequence data from target nuclear loci (<i>18S</i>, <i>28S</i>, <i>H2A</i> and <i>H3</i>) and mitochondrial genomes (15 genes) for 23 membracoid taxa yielded congruent topologies. Our results provide strong evidence for the monophyly of Ulopinae and a clade consisting of Ulopini + Cephalelini. However, a non-monophyletic Cephalelini arises from within a polyphyletic Ulopini. <i>Austrolopa</i> was strongly recovered as monophyletic in all analyses, a result also supported by morphological features. The genus currently includes six species, three of which are described based on morphological and molecular data: <i>Austrolopa botanica</i>, <b>sp. nov.</b>, <i>Austrolopa rotunda</i>, <b>sp. nov.</b> and <i>Austrolopa sublima</i>, <b>sp. nov.</b> A lectotype designation is provided for <i>Austrolopa kingensis</i> Evans, 1937, <b>sp. reval.</b> Our findings illustrate that the Australian Ulopinae is far more diverse than currently circumscribed and several species of <i>Austrolopa</i> are yet to be recognised.</p><p>ZooBank: urn:lsid:zoobank.org:pub:1480285B-8F61-4659-A929-2B1EF3168868</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"30 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sample design in biodiversity studies matters: a fine-scale study of Lawrence’s velvet worm, Peripatopsis lawrencei (Onychophora: Peripatopsidae), reveals hidden diversity","authors":"Julian A. Nieto Lawrence, Savel R. Daniels","doi":"10.1071/is23051","DOIUrl":"https://doi.org/10.1071/is23051","url":null,"abstract":"<p>A fine-scale phylogenetic and phylogeographic analysis of <i>Peripatopsis lawrencei</i> s.l. was conducted with both mitochondrial and nuclear DNA sequence data, using both external morphology and scanning electron microscopy of taxonomically important characters. A total of 119 sequences were used for the mitochondrial cytochrome <i>c</i> oxidase subunit I (<i>COI</i>) whereas a single representative specimen from each locality was sequenced for the nuclear <i>18S</i> rRNA locus. Phylogenetic analyses were conducted on the total <i>COI</i> data set and the combined <i>COI</i> + <i>18S</i> rRNA data set using a Bayesian analysis and maximum likelihood analyses. For the combined DNA sequence data set, a divergence time estimation was further undertaken in BEAST and specimens placed in a phylogenetic framework including all the described <i>Peripatopsis</i> species from South Africa. In addition, a phylogeographic study was conducted exclusively on <i>P. lawrencei</i> s.s. (clade A) using an analysis of molecular variance and haplotype network. Phylogenetic results indicated that, at the Oubos sample locality, two highly distinct genetic lineages were present (clades A and B), whereas a divergence time estimation suggests a Miocene cladogenesis of the novel Oubos lineage. Marked phylogeographic structure was observed for <i>P. lawrencei</i> s.s. (restricted to clade A) across the distribution range with limited maternal dispersal. Morphologically, the two sympatric lineages at Oubos A and B differed in leg pair number, ventral colour and dorsal scale rank counts, as evident from scanning electron microscopy. Our results support the recognition of a distinct species that occurs in sympatry with <i>P. lawrencei</i> s.s. The new species<i>, P. aereus</i> sp. nov. (clade B) is described and the implication for fine-scale taxonomic studies on saproxylic taxa is discussed.</p><p>ZooBank: urn:lsid:zoobank.org:pub:AB6E0BDA-7B5F-4FD3-A863-BA7C814E278C</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"276 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Castaways: the Leeward Antilles endemic spider genus <i>Papiamenta</i> (Araneae: Pholcidae).","authors":"Bernhard A Huber, Guanliang Meng, Tim M Dederichs, Peter Michalik, Martin Forman, Jirí Král","doi":"10.1071/IS23052","DOIUrl":"10.1071/IS23052","url":null,"abstract":"<p><p>Ninetinae is a group of small to tiny short-legged spiders largely restricted to arid habitats. Among daddy-long-legs spiders (Pholcidae) this is by far the least diverse subfamily but this may partly be a result of inadequate collecting, poor representation in collections or scientific neglect. We build on a large recent collection of the ninetine genus Papiamenta Huber, 2000 from the Leeward Antilles and use cytochrome oxidase 1 (COI ) sequences, extensive scanning electron microscopy data, transmission electron microscopy data and karyotyping to analyse this geographically isolated and poorly known island genus. COI sequences support the split between the two morphologically distinct species on Curaçao but genetic distances between these are surprisingly low (7.4-9.8%; mean 8.6%). The type species P. levii (Gertsch, 1982) may include more than one species but COI and morphology suggest conflicting clade limits. A third species, P. bonay Huber sp. nov. is newly described from Bonaire. Our data on sperm ultrastructure and karyology are puzzling as these suggest different phylogenetic affinities of Papiamenta to other genera. Males transfer sperm as individual sperm (cleistosperm), agreeing with the putative closest relatives as suggested by molecular data, the North American genera Pholcophora and Tolteca . The sex chromosome system (X 1 X 2 X 3 Y ) of P. levii , however, is as in the South American Ninetinae genera Gertschiola and Nerudia but different from the putative closest relatives. ZooBank: urn:lsid:zoobank.org:pub:7A6A2E84-3A61-4637-AF6F-0E31A9FA79A8.</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"38 ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140923825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An integrative taxonomic approach to the Atlantic Hansarsia (formerly Nematoscelis) yields new krill taxa (Crustacea: Euphausiidae)","authors":"D. N. Kulagin, U. V. Simakova, A. A. Lunina, A. L. Vereshchaka","doi":"10.1071/is23034","DOIUrl":"https://doi.org/10.1071/is23034","url":null,"abstract":"<p>A recent molecular phylogenetic and biogeographic study on the krill genus <i>Hansarsia</i> revealed undescribed cryptic diversity in the Atlantic. Each of four species analysed encompassed robust molecular clades that were linked to dimorphic males in <i>H. microps</i>, <i>H. atlantica</i> and <i>H. tenella</i>. We tested the robustness and divergence of the observed clades using an integrative approach including (1) three independent species delimitation methods for the mitochondrial <i>COI</i> gene (ASAP, GMYC, bPTP), (2) variability of two nuclear genes (<i>H3</i> and <i>ITS1</i>) and (3) morphological analysis (MDS and PCA) with a dataset of 22 characters scored for 131 specimens. Both molecular and morphological analyses resulted in at least six distinct clades within the Atlantic <i>Hansarsia.</i> The strongest divergence was revealed between the two clades of <i>H. tenella</i>, one of which we diagnosed as a new species. Two clades of <i>H. megalops</i> also showed significant divergence but in the absence of males, we were reluctant to designate new species. Different clades linked to male forms in <i>H. microps</i> and <i>H. atlantica</i> are suggested as an incipient species. We also hypothesise an unusual trend in the evolution of euphausiids, in which visual recognition enhances tactile interaction during mating. Our results show that analyses of ostensibly well studied groups may yet yield taxonomic surprises.</p><p>ZooBank: urn:lsid:zoobank.org:pub:AE045636-50EF-450A-B9B3-9231E8B91522</p>","PeriodicalId":54927,"journal":{"name":"Invertebrate Systematics","volume":"31 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139495995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}