Journal article
Description of a New Blind and Rare Species of Xyliphius (Siluriformes: Aspredinidae) from the Amazon Basin Using High-Resolution Computed Tomography
Copeia, v 105(1), pp 14-28
01 Mar 2017
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Abstract
Xyliphius sofiae, new species, is described based on a unique specimen exhibiting four autapomorphies: eyes absent vs. present (though reduced); color pale, lacking pigment vs. head and body darkly pigmented; branchiostegal rays five vs. four; and unculiferous tubercles on posterior body distributed evenly vs. enlarged unculiferous tubercles typically arranged in five distinct rows above pelvic-fin base to posterior end of caudal peduncle. In addition, the pectoral fin of X. sofiae, new species, has one ossified proximal radial vs. two in congeners (except X. magdalenae, not examined). Xyliphius sofiae, new species, differs from all congeners except X. lepturus by snout tip elongated and narrowly rounded vs. short and broadly rounded, often with small median notch; fifth ceratobranchial relatively narrow with elongate acicular teeth vs. broadly expanded, leaf-shaped, with shorter and broader, conical teeth; anterior limits of branchial apertures separated by distance less than length of aperture vs. greater than length of aperture; anal-fin rays modally nine vs. seven; and lateral line extending onto base of caudal-fin rays vs. finishing in hypural region. Based on the single specimen collected in the main channel of the Rio Amazonas near Iquitos, Peru, we describe the osteology of X. sofiae, new species, using a non-invasive technique: high-resolution X-ray computed tomography (HRXCT). We consider Xyliphius lombarderoi Risso and Risso, 1964, a species based on a unique holotype that is now lost, to be a subjective junior synonym of X. barbatus Alonso de Aramburu and Aramburu, 1962. Variable characteristics are summarized for the seven species of Xyliphius treated here as valid, and their distributions are plotted based on a comprehensive review of museum specimens.
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Details
- Title
- Description of a New Blind and Rare Species of Xyliphius (Siluriformes: Aspredinidae) from the Amazon Basin Using High-Resolution Computed Tomography
- Creators
- Tiago P. Carvalho - Universidade Federal do Rio Grande do SulRoberto E. Reis - Pontifícia Universidade Católica do Rio Grande do SulMark H. Sabaj - Drexel University
- Publication Details
- Copeia, v 105(1), pp 14-28
- Publisher
- Amer Soc Ichthyologists & Herpetologists
- Number of pages
- 15
- Grant note
- 229355/2013-7 / PNPD-CAPES fellowship NSF DEB-1257813 / iXingu Project 306455/2014-5 / onselho Nacional de Desenvolvi-mento Cientifico e Tecnologico (CNPq); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Fundacao de Apoio a Pesquisa do Distrito Federal (FAPDF) 2361-2551/14-7 / Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul-FAPERGS; Fundacao de Amparo a Ciencia e Tecnologia do Estado do Rio Grande do Sul (FAPERGS) NSF DEB-0315963 / All Catfish Species Inventory
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Academy of Natural Sciences of Drexel University
- Web of Science ID
- WOS:000400677800002
- Scopus ID
- 2-s2.0-85015175756
- Other Identifier
- 991019330813004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Zoology