Zoologischer Anzeiger最新文献

{"title":"First description of an intact copula in Coniopterygidae (Insecta: Neuropterida: Neuroptera) based on microCT imaging","authors":"Ulrike Aspöck ,&nbsp;Viola Winkler ,&nbsp;Horst Aspöck ,&nbsp;Axel Gruppe ,&nbsp;Brian Metscher","doi":"10.1016/j.jcz.2024.10.011","DOIUrl":"10.1016/j.jcz.2024.10.011","url":null,"abstract":"<div><div>The finding of a copulating pair of <em>Coniopteryx (Holoconiopteryx) haematica</em> (Mc Lachlan, 1868) offers the possibility to study the position of the elements of the genitalia of both sexes to each other for the first time in Coniopterygidae by using X-ray microcomputed tomography. The genital sclerites of the male resemble largely those of <em>Coniopteryx (Coniopteryx) pygmaea</em> (Enderlein, 1906) treated previously. Therefore, terminology and interpretation of the genital sclerites following the “gonocoxite concept” are adopted. The dominating eye-catching sclerite of the male is sternite 9 (the hypandrium externum of diverse taxa), the dominating sclerite of the female genitalia is the sclerotized spermatheca embedded in the “copulatory cup” of the hypandrium externum of the male. There is no indication that the genital sclerites of the male, the so called intromittent sclerites, are pushed into the female during copulation. They apparently function as a track for the distal part of the long slim ductus ejaculatorius.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 24-29"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"White-toothed shrew (genus Crocidura) diversity in Iran: Molecular evidence and taxonomic implications","authors":"Ahmad Mahmoudi ,&nbsp;Hamid Haddadian Shad ,&nbsp;Boris Kryštufek","doi":"10.1016/j.jcz.2024.12.009","DOIUrl":"10.1016/j.jcz.2024.12.009","url":null,"abstract":"<div><div>White-toothed shrews (genus <em>Crocidura</em>), with a wide distribution across the Palearctic, are among the lesser-known small mammals in Iran. Recent molecular studies uncovered several deep divergences within traditional nominal species, challenging their taxonomic status. Specimens from across Iran were collected to explore the diversity and taxonomy of the small white-toothed shrew (<em>Crocidura suaveolens</em>) and the bicoloured shrew (<em>Crocidura leucodon</em>) using both morphological and molecular data. Mitochondrial cytochrome <em>b</em> (<em>Cytb</em>) analysis identified five distinct lineages, two of which are endemic to Iran. The specific position of the Iranian bicoloured shrew (<em>Crocidura persica</em> Thomas, 1907) is supported by morphological and genetic (<em>Cytb</em> and <em>Brca1</em>) evidence. Three lineages of <em>C. suaveolens</em> sensu lato were classified as <em>C. suaveolens</em> sensu stricto, <em>Crocidura gueldenstaedtii</em> and <em>Crocidura caspica</em>; the first species also contains sequences from Dasht-Bujnurd which is the type locality of <em>Crocidura gmelini</em>. An unnamed lineage from central Iran (lineage VIII) is described as a new species, <em>Crocidura darvishi</em> n. sp. The three <em>suaveolens</em> group species clearly differ in <em>Cytb</em> sequences but less so in the nuclear <em>Brca1</em> tree. Morphological differences are also slight. These findings, along with a taxonomic annex of Iranian species, enhance our understanding of Iran's unique fauna. Despite its peripheral location in temperate biotas, Iran is a hotspot for basal lineages of small mammals, especially in refugial areas like the Hyrcanian Forest (<em>C. persica</em>, <em>C. caspica</em>), Zagros (<em>C. darvishi</em> n. sp.), and Kopet-Dagh.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 149-158"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monogamy and sexual dimorphism: Evaluation of the morphometric relationship of body and secondary sexual structures in heterosexual pairs of Alpheus estuariensis Christoffersen, 1984","authors":"Carla Janes Fernandes Alcantara ,&nbsp;Ana Laura de Alcântara Pontes ,&nbsp;Maria das Graças Ferreira Alcântara ,&nbsp;Allysson Pontes Pinheiro ,&nbsp;Whandenson Machado do Nascimento","doi":"10.1016/j.jcz.2024.12.002","DOIUrl":"10.1016/j.jcz.2024.12.002","url":null,"abstract":"<div><div>Sexual monomorphism or reduced sexual dimorphism in the body or cheliped size is expected in caridean shrimps that exhibit a monogamous mating system. In contrast to the mating system models proposed in crustaceans, monogamous heterosexual pairs of same <em>Alpheus</em> species exhibit sexual dimorphism. This raises questions about how sexual selection acts in these shrimps. We hypothesized that secondary sexual structures, but not the body, exhibit a tendency for size and directional allometry in each sex. We evaluate sexual size dimorphism in heterosexual pairs of <em>Alpheus estuariensis</em>, and the morphometric relationship of the body, and secondary sexual structures (cheliped and second pleonal segment), in heterosexual pairs of three populations. Carapace length did not differ between males and females, exhibiting a positive size correlation among monogamous pairs, indicating size-assortative mating across the three locations. Males bear larger cheliped propodus, while females had larger second pleura, indicating sexual size dimorphism. The propodus relationship between the sexes displayed positive allometry in the Paraíba do Norte River, whereas heterosexual pairs from the Paripe River and Massangana River showed isometry in cheliped propodus size between sexes. Furthermore, heterosexual pairs demonstrated negative allometry for pleura width. These findings support the hypothesis that secondary sexual structures, but not the body, exhibit size and directional allometry. We believe that these results are linked to the reproductive success of each sex in <em>A. estuariensis</em>. This implies that even within a monogamous mating system, selective sexual pressures play a role in the sexual dimorphism in these shrimps.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 30-37"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"When the first impression is not what counts: Two striking new species of Schuhocoris (Rhyparochromidae: Rhyparochrominae: Antillocorini)","authors":"Dolores María Goñi ,&nbsp;María Cecilia Melo ,&nbsp;Pablo M. Dellapé","doi":"10.1016/j.jcz.2024.12.007","DOIUrl":"10.1016/j.jcz.2024.12.007","url":null,"abstract":"<div><div>The rhyparochromid tribe Antillocorini is a cosmopolitan group of very small to minute true bugs distributed in the tropics and subtropics, extending to the temperate regions but also well represented in oceanic islands in the Pacific. In America, 19 genera are present, all with species distributed in the Neotropics. The monotypic genus <em>Schuhocoris</em> Slater, 1985 was described from Peru, Panama and Brazil. Here we expand the characters’ set defining <em>Schuhocoris</em>, and describe two new species in the genus, <em>Schuhocoris ecuatorianus</em> <strong>n. sp.</strong> and <em>S. slateri</em> <strong>n. sp.</strong>, both from Ecuador, that present abdominal modifications compatible with stridulatory structures, something not reported for members of the tribe so far. Dorsal and lateral habitus photographs, along with images of relevant external characters and from the pygophore and parameres of the new species are given, and the presence and morphology of stridulatory devices are discussed.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 144-148"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The remarkable richness of Girardia (Platyhelminthes: Tricladida) in Brazilian subterranean habitats: Two new species from sandstone and limestone caves","authors":"Ana Laura Morais ,&nbsp;Giuly G. Iturralde ,&nbsp;Diana J.K. Almeida ,&nbsp;Maria Elina Bichuette ,&nbsp;Jonas Eduardo Gallão ,&nbsp;Ana Leal-Zanchet ,&nbsp;Victor H. Valiati","doi":"10.1016/j.jcz.2024.11.005","DOIUrl":"10.1016/j.jcz.2024.11.005","url":null,"abstract":"<div><div>The triclads of the suborder Continenticola have little known diversity in freshwater environments in South America, with few studies on their distribution in the Neotropical region. In this article, we describe two new species of <em>Girardia</em> that live in caves and discuss their phylogenetic relationships with the most recent phylogeny of the genus. <em>Girardia patiensis</em> Morais &amp; Leal-Zanchet, sp. nov. and <em>Girardia alba</em> Morais &amp; Leal-Zanchet, sp. nov. are described from a single cave, made of sandstone (Gruta do Castelo) and limestone (Gruna da Pingueira), respectively, located in transition areas between Cerrado and Caatinga in northeastern Brazil. Specimens of both <em>G. patiensis</em> and <em>G. alba</em> have whitish bodies and small auricles. Eyes are small in <em>G. patiensis</em> and absent in <em>G. alba</em>. Both species can be easily differentiated from each other and from their congeners by a combination of characteristics of their copulatory apparatus. <em>Girardia patiensis</em> has a large and irregular, funnel-shaped bulbar cavity with indentations and diverticula and a slightly sloping bursal canal. <em>Girardia alba</em> has a bulbar cavity with asymmetrically bifurcated portions and an angled bursal canal. Phylogenetic inferences based on a combined molecular matrix (concatenating <em>COI</em> + <em>EF1α</em>) indicated that <em>G. patiensis</em> and <em>G. alba</em> form a well-supported clade, closely related to an undescribed, epigean species from Mexico, which constitutes the sister group to the epigean <em>G. schubarti</em> from Southern Brazil. The two new species are categorized as troglobites and are under threat, since Gruta do Castelo (type-locality of <em>G. patiensis</em>) is visited in an uncontrolled manner and the site where they occur is constantly trampled, while Gruna da Pingueira (type-locality of <em>G. alba</em>) has no legal protection (Conservation Unit), and its surroundings are deforested.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 100-112"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differentiation of the Arctic Sculpin Myoxocephalus scorpioides (Fabricius, 1780) and its position among species of the genus Myoxocephalus (Cottidae)","authors":"Irina N. Moreva ,&nbsp;Olga A. Radchenko ,&nbsp;Anna V. Petrovskaya","doi":"10.1016/j.jcz.2024.12.008","DOIUrl":"10.1016/j.jcz.2024.12.008","url":null,"abstract":"<div><div>The phylogenetic position of the Arctic Sculpin <em>Myoxocephalus scorpioides</em> from the East Arctic was determined using molecular genetics and karyological methods. This study presents the first data on the mitochondrial DNA genes of this species from the East Siberian Sea, whose haplotype contains 32 species-specific nucleotide substitutions. Moreover, it is the first to report the karyotype of the species, which is comprised of 42 chromosomes and 44 chromosome arms. Phylogenetic analysis revealed that the Arctic Sculpin is positioned in one of the two <em>Myoxocephalus</em> groups, together with <em>Myoxocephalus quadricornis</em> and <em>Megalocottus platycephalus</em> as well as with <em>M. aenaeus</em> and <em>M. octodecemspinosus</em>. The position of <em>M. scorpioides</em> confirms the non-monophyletic relationships of the genus <em>Myoxocephalus</em>. The results of this study indicate that the genera <em>Myoxocephalus</em> and <em>Megalocottus</em> need to be revised.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 135-143"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sexual dimorphism of plateau brown frog in Haibei region of Qinghai in China","authors":"Xuze Zhang ,&nbsp;Xiaodong Ma ,&nbsp;Fei Peng ,&nbsp;Yi Yu ,&nbsp;Xinrong Lin ,&nbsp;Jinliang Wei ,&nbsp;Yingfang Shen","doi":"10.1016/j.jcz.2024.12.003","DOIUrl":"10.1016/j.jcz.2024.12.003","url":null,"abstract":"<div><div><em>Rana kukunoris</em> (plateau brown frog) is an amphibian species endemic to the Qinghai-Tibet Plateau. In this study, 60 adult specimens (30 ♀, 30 ♂) were collected from the Haibei Alpine Meadow Ecosystem Positioning Station of the Chinese Academy of Science and measured for 25 morphological traits, including adult body weight and body length. The morphological indexes of male and female individuals were compared and analysed. The results showed that 11 morphological traits in females, including body length and interorbital spacing, were significantly higher in value than those in males. The mean SVL of famales (50.10 ± 1.04) was larger than of males (48.43 ± 1.38), the sexual index was 0.033. The mean weight of females (10.93 ± 0.67) was 1.168 times that of males (9.36 ± 0.70). Among all traits, 23 morphological characteristics in females and 22 in males showed allometric effects. Covariance analysis of morphological features with snout–vent length as the covariate demonstrated significant correlations between body weight, internal distance, interorbital distance, forearm width, interior metatarsal, mouth-to-spat distance, third finger length, and first finger length, indicating that, when considering snout–vent length, significant differences were observed. Our results showed that females were larger than males in terms of sexual dimorphism. Such sexual dimorphism may be a result of the combined effects of fecundity selection theory and environmental factors. The measured values also provide a reference to explore sexual dimorphic traits between sexes and their adaptation to the cold environments.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 67-73"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geometric morphometrics applied to the study of morphological variation in South American species of the genus Cormocephalus Newport, 1844 (Chilopoda, Scolopendromorpha, Scolopendridae), and description of a new species from Colombia","authors":"Walter Aparecido Arruda de Oliveira,&nbsp;Amazonas Chagas-Jr","doi":"10.1016/j.jcz.2024.11.007","DOIUrl":"10.1016/j.jcz.2024.11.007","url":null,"abstract":"<div><div>Some species of the genus <em>Cormocephalus</em> Newport, 1844 have been described based on a few specimens, which makes it difficult to quantify intra- and interspecific morphological variation. As a result, some diagnostic morphological characteristics may be ambiguous or have no real taxonomic value in species delimitation. In this context, geometric morphometrics emerges as a valuable tool capable of evaluating the variation in shape of a given taxon in a quantitative way, helping to clarify hypotheses about its morphological characteristics. In this study, geometric morphometrics was implemented to record shape variation in three external morphological structures (cephalic plate, forcipular coxosternite, and tergite 21) of three species: <em>C</em><em>.</em> <em>andinus</em> (Kraepelin, 1903), <em>C</em><em>.</em> <em>brasiliensis</em> Humbert &amp; Saussure, 1870, and <em>C</em><em>.</em> <em>guildingii</em> Newport, 1845, distributed in South America. The objective was to evaluate and describe the morphological differences between species within the genus. Additionally, ten out of the 13 South American species described within the genus were reviewed and used as comparative material in the description of a new species from Colombia. As a result, the geographic distribution of the examined species is expanded, and the list of species belonging to the <em>guildingii</em>-subgroup is updated. The following taxonomic changes are suggested: <em>C</em><em>.</em> <em>abundantis</em> González-Sponga, 2000, and <em>C</em><em>.</em> <em>edithae</em> González-Sponga, 2000, are proposed as junior synonyms of <em>C. brasiliensis</em>; <em>C</em><em>.</em> <em>amazonae</em> (Chamberlin, 1914), as junior synonym of <em>C. andinus</em>; and <em>C</em><em>.</em> <em>facilis</em> González-Sponga, 2000, <em>C</em><em>.</em> <em>glabratus</em> González-Sponga, 2000, and <em>C</em><em>.</em> <em>maritme</em> González-Sponga, 2000 as junior synonyms of <em>C. guildingii</em>. Regarding geometric morphometry, the shape of the three structures differed significantly among species: the analysis of canonical variates revealed low shape overlap. The cross-validation test demonstrated general discrimination rates of 81.25 % for the cephalic plate, 84.00 % for forcipular coxosternite, and 73.49 % for tergite 21. In terms of allometric percentage, only a low proportion of the shape variation can be attributed to size variation: 9.27 % for the cephalic plate, 6.18 % for forcipular coxosternite, and 3.89 % for tergite 21. The lower percentage rates found in <em>C. guildingii</em> may be associated with its broader geographic distribution compared to the other analyzed species, potentially resulting in greater morphological variation. Furthermore, the relatively smaller sample size may also have influenced these results. However, it can be concluded that morphometric analysis can provide enlightening insights and relatively robust results compared to other studi","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 45-66"},"PeriodicalIF":1.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gall midges of wild yam (Dioscorea: Dioscoreaceae) in Japan, with integrative descriptions of two new species","authors":"Ayman Khamis Elsayed ,&nbsp;Ko Mochizuki ,&nbsp;Atsushi Kawakita","doi":"10.1016/j.jcz.2024.12.010","DOIUrl":"10.1016/j.jcz.2024.12.010","url":null,"abstract":"<div><div><em>Dioscorea</em>, or yam, is the largest genus of Dioscoreaceae and includes several species that are cultivated and recognized as the fourth most important tuber crop. Despite the economic importance, only three described gall midge species (Diptera: Cecidomyiidae: Cecidomyiinae) are known to be associated with <em>Dioscorea</em> worldwide. Among these, only <em>Dasineura dioscoreae</em> (Shinji) that forms leaf galls on <em>D. nipponica</em> was previously known in Japan. However, the type specimens of this species have been lost, its galls are rarely encountered, and little is known about its morphology. In the present study, we describe two new species of gall midges associated with wild <em>Dioscorea</em> species in Japan based on an integrative taxonomic approach<em>. Schizomyia blastianthus</em> Elsayed, n. sp. typically develops in the male flower buds of <em>D. tokoro, D. gracillima, D. nipponica, D. septemloba</em> and <em>D. quinquelobata</em>. <em>Ametrodiplosis aderces</em> Elsayed, n. sp. develops in the male flower buds of <em>D. nipponica</em> and <em>D. septemloba</em>. Additionally, we report the rediscovery of the rare species <em>Dasineura dioscoreae</em>, provide a redescription, and designate a neotype. A description of larva, pupa and adults, illustrations, molecular phylogeny and notes on life history are given for each species.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"315 ","pages":"Pages 34-63"},"PeriodicalIF":1.2,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrative phylogeny of Corydoradinae (Siluriformes: Callichthyidae) with an emphasis on northwestern La Plata species, including descriptions of a new genus and species","authors":"Felipe Alonso ,&nbsp;Guillermo Enrique Terán ,&nbsp;Gastón Aguilera ,&nbsp;Martin Miguel Montes ,&nbsp;Wilson Sebastián Serra Alanís ,&nbsp;Pablo Calviño ,&nbsp;Héctor Samuel Vera-Alcaraz ,&nbsp;Yamila Cardoso ,&nbsp;Stefan Koerber ,&nbsp;Juan Marcos Mirande","doi":"10.1016/j.jcz.2024.11.006","DOIUrl":"10.1016/j.jcz.2024.11.006","url":null,"abstract":"<div><div>The knowledge about the diversity and phylogeny of South American callichthyid armored catfishes of the subfamily Corydoradinae is still growing, after important recent contributions, and many species have uncertain relationships. In this study, we present the first combined phylogenetic hypothesis for the genus based on five genes, 83 morphological characters, and 153 species, providing synapomorphies for some of the main genera of Corydoradinae, as recently defined. The inclusion of species not previously analyzed in a phylogenetic context challenged the monophyly of <em>Hoplisoma</em> and required the definition of a new genus for endemic species from the Andean portion of the northwestern La Plata basin (ANWLP): <em>Hoplisoma gladysae</em>, <em>Hoplisoma micracanthum</em>, and <em>Hoplisoma petracinii</em>. We found <em>Hoplisoma</em> non monophyletic with <em>Hoplisoma sensu stricto</em> not sister to a clade of species herein named the ‘<em>Hoplisoma</em>’ <em>paleatum</em> clade. In this clade we recovered a new species of <em>Hoplisoma</em>, which is endemic to the upper Bermejo basin, as sister to ‘<em>Hoplisoma</em>’ <em>paleatum</em> from the lower La Plata basin. The new species is distinguished from all congeners by a unique coloration similar to that of the syntopic <em>H. micracanthum</em>, suggesting a putative case of Müllerian co-mimicry.</div></div>","PeriodicalId":49332,"journal":{"name":"Zoologischer Anzeiger","volume":"314 ","pages":"Pages 10-23"},"PeriodicalIF":1.2,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}