Living in the waterfalls: A new species of Trichomycterus (Siluriformes: Trichomycteridae) from Tabay stream, Misiones, Argentina

Terán, Guillermo Enrique; Ferrer, Juliano; Benítez, Mauricio Fabián; Alonso, Felipe; Aguilera, Gastón; Mirande, Juan Marcos

doi:10.1371/journal.pone.0179594

Cited by 13 publications

(18 citation statements)

References 21 publications

(31 reference statements)

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“…Subsequently, Datovo & Bockmann 29 provided evidence from the head musculature supporting a clade consisting of C. davisi and C. stawiarski. Datovo et al 78 included C. perkos in that group based on the shared presence of a high number of branchiostegal rays and, more recently, Terán et al 79 found morphological support to include in that group also their newly described C. ytororo. Katz et al 31 diagnosed Cambeva based on a combination of plesiomorphic or general character states and some derived characters uniquely shared by Cambeva and Scleronema.…”

Section: Discussionmentioning

confidence: 99%

Phylogenomic analysis of trichomycterid catfishes (Teleostei: Siluriformes) inferred from ultraconserved elements

Ochoa

Datovo

DoNascimiento

et al. 2020

Sci Rep

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The family Trichomycteridae is one of the most diverse groups of freshwater catfishes in South and Central America with eight subfamilies, 41 genera and more than 300 valid species. Its members are widely distributed throughout South America, reaching Costa Rica in Central America and are recognized by extraordinary anatomical specializations and trophic diversity. In order to assess the phylogenetic relationships of Trichomycteridae, we collected sequence data from ultraconserved elements (UCEs) of the genome from 141 specimens of Trichomycteridae and 12 outgroup species. We used a concatenated matrix to assess the phylogenetic relationships by Bayesian inference (BI) and maximum likelihood (ML) searches and a coalescent analysis of species trees. The results show a highly resolved phylogeny with broad agreement among the three distinct analyses, providing overwhelming support for the monophyletic status of subfamily Trichomycterinae including Ituglanis and Scleronema. Previous relationship hypotheses among subfamilies are strongly corroborated, such as the sister relationship between Copionodontinae and Trichogeninae forming a sister clade to the remaining trichomycterids and the intrafamilial clade TSVSG (Tridentinae-Stegophilinae-Vandelliinae-Sarcoglanidinae-Glanapteryginae). Monophyly of Glanapteryginae and Sarcoglanidinae was not supported and the enigmatic Potamoglanis is placed outside tridentinae. Unraveling the relationships of major sections of the Tree of Life is one of the most daunting challenges of the evolutionary biology. Massively parallel DNA sequencing (so-called Next-gen sequencing) is a promising tool that is helping to resolve the interrelationships of longstanding problematic taxa 1-4. One of the most common classes of phylogenomic methods involves the sequence capture of nuclear regions in the flanks and cores of the ultraconserved elements (UCEs) 2. The more variable flanking UCE regions allow a better resolution of nodes across a broad range of evolutionary timescales in a given phylogeny 2. As variation in the flanks increases with distance from the core UCE, this combined approach displays a balance between having a high enough substitution rate while minimizing saturation, thus providing information for estimating phylogenies at multiple evolutionary timescales 2,3. Recent studies of actinopterygians 5 , flatfishes 6 , cichlids 7 , ostariophysan 8 , acanthomorphs 9 , Loricariidae 10 , knifefishes 11 , among other vertebrates groups 3,12 , have shown that UCEs are excellent markers for phylogenetic studies because of their ubiquity among taxonomic groups 13 , low degrees of paralogy 14 , and low saturation 3. According to Gilbert et al. 15 , the phylogenetic informativeness of the combined flank and core regions of UCEs outperfoms protein-coding genes used in multilocus studies. Additionally, phylogenomic approaches are characterized by their potential to collect data from at least one order of magnitude more loci than the traditional sequencing techniques applied to protein-coding le...

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Section: Discussionmentioning

confidence: 99%

Phylogenomic analysis of trichomycterid catfishes (Teleostei: Siluriformes) inferred from ultraconserved elements

Ochoa

Datovo

DoNascimiento

et al. 2020

Sci Rep

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“…More recently, five pelvic-less trichomycterines have been recorded from the Argentinean Andes (Fernández and Liotta 2016), as well as two species lacking pelvic fin being described from south-eastern and southern Brazil (Ferrer and Malabarba 2011;Ochoa et al 2017a). These Brazilian species are presently placed in Cambeva Katz, Barbosa, Mattos & Costa, 2018, a genus comprising 25 valid species endemic to south-eastern and southern Brazil (Katz et al 2018;dos Reis et al 2019), as well as a single species from north-eastern Argentina (Terán et al 2017).…”

Section: Introductionmentioning

confidence: 99%

A new species from subtropical Brazil and evidence of multiple pelvic fin losses in catfishes of the genus Cambeva (Siluriformes, Trichomycteridae)

Costa¹,

Feltrin²,

Katz³

2020

ZSE

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A third pelvic-less species of Cambeva from river basins draining the Geral mountain range in southern Brazil is described. It is distinguished from other congeners lacking pelvic fin and girdle, C. pascuali and C. tropeiro, by having six pectoral-fin rays, 20–23 dorsal procurrent caudal-fin rays, 15–20 opercular and 25–30 interopercular odontodes and a different colour pattern consisting of flank dark brownish-grey with two irregular horizontal rows of small pale yellow grey marks. Whereas available molecular evidence indicates that C. pascuali is more closely related to C. zonata, a species with well-developed pelvic fin, and C. tropeiro is more closely related to C. balios, another species also with well-developed pelvic fin; osteological data strongly suggest that the new species herein described is more closely related to C. diatropoporos than to other congeners. Therefore, this study indicates that the pelvic fin and pelvic-fin support have been lost independently in each of these three species of Cambeva, which corresponds to 11% of all describe species. This result highly contrasts with the closely-related trichomycterine genera Trichomycterus, in which only one in 50 species lost pelvic fin and girdle (0.2%) and Scleronema with all the nine included species having well-developed pelvic fin. These data suggest a stronger tendency to losing pelvic fin in Cambeva, but factors favouring this evolutionary event are still unknown.

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“…However, this group has been the subject of constant redefinitions (Barbosa & Costa, ; Bockmann & Sazima, ) that have deeply altered its taxonomic composition each time, thus raising concerns about its actual monophyletic nature (Ferrer & Malabarba, ). Other efforts recognizing subgroups of species within Trichomycterus followed (Bizerril, ; Fernández & Vari, ; Bockmann et al ., ; Wosiacki & Garavello, ; Wosiacki, ; Alencar & Costa, ; Fernández & Osinaga, ; Fernández & Miranda, ; Lima et al ., ; Wosiacki & de Pinna, , ; Barbosa & Costa, for T. itatiayae species complex; Barbosa & Costa, for T. travassosi species complex, 2012b; Datovo et al ., ; Fernández & Vari, ; Katz et al ., ; Katz & Barbosa, ; Terán et al ., for T. stawiarski group). Further complicating the recognition of putative monophyletic groups within Trichomycterus , several authors have discussed the morphological evidence suggesting closer phylogenetic relationships of some Trichomycterus species with other trichomycterine genera (DoNascimiento et al ., ; Fernández & Quispe Chuquihuamaní, ; Fernández & Schaefer, ; Mesa et al ., ), and even with other trichomycterid subfamilies (de Pinna, ).…”

Section: Discussionmentioning

confidence: 99%

A new troglomorphic species of Trichomycterus (Siluriformes: Trichomycteridae) from north‐eastern Colombia, with proposal of a new Trichomycterus subclade and remarks on some nominal species from Colombia

DoNascimiento

Prada-Pedreros

2020

Journal of Fish Biology

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Trichomycterus spectrum is described as a new species from the Alejo cave, drained by the Ranchería River basin, in La Guajira department, north‐eastern Colombia, and is the first troglomorphic species described from this region. The new species shows an advanced degree of troglomorphisms expressed as eyes absent, long barbels and body depigmented. Trichomycterus spectrum is diagnosed by the putatively autapomorphic presence of a posterior process at the anterolateral corner of the epioccipital, and is also recognized by the derived presence of a circular foramen on the neural spine of the complex vertebra and the following posterior vertebra, and by the apomorphic presence of a well‐developed coracoid bridge, distally expanded, and contacting or almost reaching the lateral margin of the cleithrum. The new species also shows the derived origin of the levator internus 4 on the dorsal surface of the posttemporo‐supracleithrum that supports Trichomycterinae monophyly. We also propose a monophyletic subgroup provisionally within Trichomycterus, here named the Trichomycterus taenia species group, which includes species distributed in cis‐ and trans‐Andean drainages in northern South America. The taxonomic status of several recently described nominal species from Colombia is discussed, with several synonymy proposals. Resumen Trichomycterus spectrum es descrito como una especie nueva de la cueva de Alejo, drenada por la cuenca del río Ranchería, en el departamento de La Guajira, noreste de Colombia, y es la primera especie troglomórfica descrita para esta región. La especie nueva exhibe un grado avanzado de troglomorfismos expresado como ojos ausentes, barbillas largas y cuerpo depigmentado. Trichomycterus spectrum es diagnósticado por la presencia putativamente autapomórfica de un proceso posterior en la esquina anterolateral del epióticoy es reconocido también por la presencia derivada de un foramen circular en la espina neural de la vértebra compleja y de la vértebra posterior siguiente, y por la presencia apomórfica de un puente coracoideo bien desarrollado, expandido distalmente y contactando o muy próximo al margen lateral del cleitro. La especie nueva también posee el origen derivado del levator internus 4 sobre la superficie dorsal del posttemporo‐supracleitro que soporta la monofilia de Trichomycterinae. También proponemos un subgrupo monofilético provisionalmente dentro de Trichomycterus, denominado aquí como el grupo de especies Trichomycterus taenia, el cual incluye especies distribuidas en cuencas cis y transandinas en el norte de Sudamérica. El estatus taxonómico de varias especies nominales recientemente descritas de Colombia es discutido, con varias propuestas de sinonimia.

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Living in the waterfalls: A new species of Trichomycterus (Siluriformes: Trichomycteridae) from Tabay stream, Misiones, Argentina

Cited by 13 publications

References 21 publications

Phylogenomic analysis of trichomycterid catfishes (Teleostei: Siluriformes) inferred from ultraconserved elements

Phylogenomic analysis of trichomycterid catfishes (Teleostei: Siluriformes) inferred from ultraconserved elements

A new species from subtropical Brazil and evidence of multiple pelvic fin losses in catfishes of the genus Cambeva (Siluriformes, Trichomycteridae)

A new troglomorphic species of Trichomycterus (Siluriformes: Trichomycteridae) from north‐eastern Colombia, with proposal of a new Trichomycterus subclade and remarks on some nominal species from Colombia

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