Project 2361: T. P. Carvalho, R. E. Reis, M. H. Sabaj. 2017. Description of a New Blind and Rare Species of Xyliphius (Siluriformes: Aspredinidae) from the Amazon Basin Using High-Resolution Computed Tomography. Copeia. 2017 (1):14-28.
Specimen: Xyliphius (ANSP/182322)
View: dorsal


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 R´ıo 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 Ara´mburu and Ara´mburu, 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.

Read the article »

Article DOI: 10.1643/CI-16-456

Project DOI: 10.7934/P2361,
This project contains
  • 1 Media
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 1.41M

Download Project SDD File
Currently Viewing:
MorphoBank Project 2361

    This research
    supported by

    Authors' Institutions

    • Academy of Natural Sciences of Drexel University, Philadelphia

    • Universidade Federal do Rio Grande do Sul

    • Pontificia Universidade Catolica do Rio Grande do Sul (PUCRS)

    • Drexel University


    member name taxa specimens media media
    Tiago Carvalho
    Project Administrator
    Last logged in 03/24/17
    Maureen Admin
    Last logged in 02/16/20
    MorphoBank Curator
    Last logged in 02/16/20

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views6060
    Project overview981
    Media views1662Media search (1427 views); M407601 (1 view); M407598 (1 view); M407591 (233 views);
    Taxon list782
    Specimen list777
    Views for media list1101

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project117
    Project downloads116
    Media downloads1M407591 (1 download);