{"id":868,"date":"2019-10-04T03:12:16","date_gmt":"2019-10-04T06:12:16","guid":{"rendered":"https:\/\/www.ufrgs.br\/ictio\/?p=868"},"modified":"2019-10-04T03:12:16","modified_gmt":"2019-10-04T06:12:16","slug":"a-new-species-of-pseudobunocephalus-friel-2008-siluriformes-aspredinidae-from-the-lower-tocantins-and-mearim-river-drainages-north-and-northeast-of-brazil","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ictio\/2019\/10\/04\/a-new-species-of-pseudobunocephalus-friel-2008-siluriformes-aspredinidae-from-the-lower-tocantins-and-mearim-river-drainages-north-and-northeast-of-brazil\/","title":{"rendered":"A new species of Pseudobunocephalus Friel, 2008 (Siluriformes: Aspredinidae) from the lower Tocantins and Mearim river drainages, North and Northeast of Brazil"},"content":{"rendered":"

Manuela Dopazo V. Le\u00e3o, Tiago P. Carvalho, Roberto E. Reis, Wolmar B. Wosiacki<\/strong><\/h2>\n

Abstract<\/h4>\n

Pseudobunocephalus timbira<\/em>, new species,\u00a0<\/em>is described from streams of the lower Tocantins and the Mearim river drainages, in North and Northeast of Brazil.\u00a0Pseudobunocephalus timbira<\/em>\u00a0can be distinguished from all congeners by having the second hypobranchial and the third basibranchial cartilaginous (vs.<\/em>\u00a0ossified). Additionally, it can be dintinguished from\u00a0P. lundbergi<\/em>\u00a0by the following putative apomorphic features within\u00a0Pseudobunocephalus<\/em>: posterolateral process of premaxilla present (vs.<\/em>\u00a0absent); bony knobs in dorsal lamina of Weberian apparatus absent (vs.<\/em>\u00a0present); distal end of posterior margin of 5th parapophysis not enlarged (vs.<\/em>\u00a0enlarged); number of ribs three (vs.<\/em>\u00a0four or five) and infraorbital sensory canal entering neurocranium via frontal (vs<\/em>. via sphenotic). It is distinguished from\u00a0P. bifidus<\/em>\u00a0and\u00a0P. iheringii<\/em>\u00a0by having a gracile body not surpassing 34 mm SL (vs.<\/em>\u00a0robust body, reaching up to 59 mm SL, respectively); by having the posterior margin of cranial fontanel concave (vs.<\/em>\u00a0posterior margin somewhat straight with parieto-supraoccipital extending anteriorly); by having a conspicuous knobby ornamentation on dorsal surface of skull (vs.<\/em>\u00a0skull knobs slightly pronounced); by having Weberian ventral blade of hemal canal opened (vs.<\/em>\u00a0closed) and by the absence of serrations on the proximal portion of the anterior margin of pectoral-fin spine (vs.<\/em>\u00a0serrations covering entire anterior margin of the pectoral spine). Additionally, it can be distinguished from\u00a0P. amazonicus<\/em>,\u00a0P. rugosus<\/em>\u00a0and\u00a0P. quadriradiatus<\/em>, by having the posterolateral mental barbel with at least one fleshy lobe located proximally along the posterior margin (vs.<\/em>\u00a0posterolateral mental barbel simple, not having fleshy lobes). It also differs from\u00a0P. amazonicus<\/em>\u00a0and\u00a0P. rugosus<\/em>\u00a0by having five branchiostegal rays (vs<\/em>. four). It also can be distinguished from\u00a0P. amazonicus<\/em>\u00a0by having the contact of hyomandibula cartilage with neurocranium limited to the sphenotic (vs.<\/em>\u00a0extending to both sphenotic and pterotic); by having the ventral blade of Weberian apparatus open (vs.<\/em>\u00a0closed) and by anterior exit of hemal canal in abdominal vertebra (vs.<\/em>\u00a0in complex vertebra); from\u00a0P. rugosus<\/em>\u00a0by coloration of proximal portion of caudal fin similar to rest of caudal fin (vs.<\/em>\u00a0clear patch) and from\u00a0P. quadriradiatus<\/em>\u00a0by the total number of pectoral fin-rays six (vs.<\/em>\u00a0five). Variable characteristics within\u00a0Pseudobunocephalus\u00a0<\/em>species\u00a0<\/em>are summarized and comments on the phylogenetic relationships and the disjunct distribution of the new species are made.<\/p>\n

link:\u00a0https:\/\/biotaxa.org\/Zootaxa\/article\/view\/zootaxa.4586.1.5<\/a><\/p>\n

\"\"<\/a>

FIGURE 1. Dorsal, lateral and ventral views of Pseudobonocephalus timbira, holotype, MPEG 21057, 31.8 mm SL, Brazil, Maranh\u00e3o, Alto Alegre do Pindar\u00e9, Jundi\u00e1 Creek, Mearim River basin.<\/p><\/div>\n

\"\"<\/a>

FIGURE 2. HRXCT model of skull and anterior body of Pseudobunocephalus timbira, MCN 19274, paratype, 29.2 mm SL. (A) dorsal view, (B) lateral view, and (C) ventral view. ach = anterior ceratohyal; bp = basipterygium; br = branchiostegal rays; cl = cleithrum; cv = complex vertebrae; den = dentary; dp = proximal portion of pectoral-fin spine; fr = frontal; hc = hemal canal; hm = hyomandibula; io = infraorbital; me = mesethmoid; mnp = middle nuchal plate; mx = maxilla; tf = temporal fontanel; pcl = posterior process of cleithrum; pnp = posterior nuchal plate; pfr = pectoral-fin rays; pfs = pectoral-fin spine; pll = posterior lateral line tubules; pmx = premaxilla; po = preopercle; pp = proximal portion of pectoral-fin spine; psc = posterior process of scapulocoracoid; pso = parietosupraoccipital; pto = pterotic; pv5 = parapophysis of fifth vertebra; puh = urohyal; r = ribs; sc = scapulocoracoid; scl = supracleithrum; spo = sphenotic; v6 = sixth vertebra; vh = ventral hypohyal. Limits between selected bones are highlighted in black.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Manuela Dopazo V. Le\u00e3o, Tiago P. Carvalho, Roberto E. Reis, Wolmar B. Wosiacki Abstract Pseudobunocephalus timbira, new species,\u00a0is described from streams of the lower Tocantins and the Mearim river drainages, in North and Northeast of Brazil.\u00a0Pseudobunocephalus timbira\u00a0can be distinguished from all congeners by having the second hypobranchial and the third basibranchial cartilaginous (vs.\u00a0ossified). Additionally, it […]<\/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-868","post","type-post","status-publish","format-standard","hentry","category-sem-categoria"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/868","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=868"}],"version-history":[{"count":1,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/868\/revisions"}],"predecessor-version":[{"id":871,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/868\/revisions\/871"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/media?parent=868"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/categories?post=868"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/tags?post=868"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}