{"id":911,"date":"2020-01-31T15:12:41","date_gmt":"2020-01-31T18:12:41","guid":{"rendered":"https:\/\/www.ufrgs.br\/ictio\/?p=911"},"modified":"2020-01-31T15:12:41","modified_gmt":"2020-01-31T18:12:41","slug":"phylogenetic-relationships-of-a-new-genus-and-species-of-stevardiine-fish-characiformes-characidae-stevardiinae-from-the-rio-amazonas-basin-peru","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ictio\/2020\/01\/31\/phylogenetic-relationships-of-a-new-genus-and-species-of-stevardiine-fish-characiformes-characidae-stevardiinae-from-the-rio-amazonas-basin-peru\/","title":{"rendered":"Phylogenetic relationships of a new genus and species of stevardiine fish (Characiformes: Characidae: Stevardiinae) from the R\u00edo Amazonas basin, Peru"},"content":{"rendered":"

James A. Vanegas\u2010R\u00edos<\/a>,\u00a0Dario R. Faustino\u2010Fuster<\/a>,\u00a0Vanessa Meza\u2010Vargas<\/a>,\u00a0Hern\u00e1n Ortega<\/a><\/p>\n

Abstract<\/h2>\n
Varicharax nigrolineatus<\/i>, a new genus and species of stevardiine fish, is described from the R\u00edo Amazonas basin, Peru, based on a comprehensive phylogenetic comparison with other characids. Two data sets (A: combined morphological and molecular matrix, 474 species and 6,653 characters; B: morphological matrix, 216 species and 524 characters) were used to estimate the phylogenetic relationships of the new genus. Morphological and molecular data from these data sets were taken from two previously published matrices on characids.\u00a0Varicharax nigrolineatus<\/i>\u00a0is phylogenetically diagnosed by 18 autapomorphies in total (from both data sets), which are related to different anatomical characteristics of the neurocranium, body, and fins. Furthermore,\u00a0V.\u00a0nigrolineatus<\/i>\u00a0can be easily differentiated from all characids (except\u00a0Acrobrycon<\/i>\u00a0in part) by the following combination of characters: the presence of a hypertrophied caudal\u2010fin squamation on the lower caudal\u2010fin lobe forming a remarkable pouch\u2010like structure, consisting of multiple series of large adjacent scales (being almost similar or slightly more pronounced in males than in females), the presence of caudal\u2010fin bony hooks on the lower lobe in adult males, complete lateral line, and a dark mid\u2010lateral stripe that extends from the posterior border of the head to caudal peduncle. In the resulting topologies from both data sets, the phylogenetic placement of\u00a0V.\u00a0nigrolineatus<\/i>\u00a0was well supported within Stevardiinae. Additionally,\u00a0V.\u00a0nigrolineatus<\/i>\u00a0was resolved within the tribe Stevardiini as sister group of a clade formed by\u00a0Chrysobrycon<\/i>\u00a0+\u00a0Pseudocorynopoma<\/i>\u00a0and\u00a0Corynopoma<\/i>\u00a0+\u00a0Gephyrocharax<\/i>\u00a0in the final hypothesis from the combined data set, whereas in the final topology from the morphological data set,\u00a0V.\u00a0nigrolineatus<\/i>\u00a0was placed as sister group of a clade comprised of\u00a0Acrobrycon<\/i>\u00a0and the Stevardiini without\u00a0Argopleura<\/i>.<\/div>\n
<\/div>\n
https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/jzs.12346<\/a><\/div>\n
<\/div>\n
\n
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Phylogenetic relationships of Varicharax nigrolineatus within Stevardiinae obtained from the data set A (combined molecular and morphological matrix) (L = 58,206; Fit = 968.263752) using extended implied weighting. Node numbers are indicated above branches. Support values are presented below branches and separated by a slash (Absolute frequency\/GC value). Full tree available as Figure S1<\/p><\/div>\n

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Varicharax nigrolineatus, (a) MUSM 60288, male, holotype, 36.1 mm SL; (b) MUSM 58235, female, paratype, 27.9 mm SL, collected with holotype<\/p><\/div>\n<\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

James A. Vanegas\u2010R\u00edos,\u00a0Dario R. Faustino\u2010Fuster,\u00a0Vanessa Meza\u2010Vargas,\u00a0Hern\u00e1n Ortega Abstract Varicharax nigrolineatus, a new genus and species of stevardiine fish, is described from the R\u00edo Amazonas basin, Peru, based on a comprehensive phylogenetic comparison with other characids. Two data sets (A: combined morphological and molecular matrix, 474 species and 6,653 characters; B: morphological matrix, 216 species and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-911","post","type-post","status-publish","format-standard","hentry","category-sem-categoria"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/comments?post=911"}],"version-history":[{"count":1,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/911\/revisions"}],"predecessor-version":[{"id":914,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/911\/revisions\/914"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/media?parent=911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/categories?post=911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/tags?post=911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}