Abstract
Panaqolus tankei is described from the Xingu River, Brazil. The new species is diagnosed from P. albomaculatus, P. dentex, P. nix, P. nocturnus, and P. koko by its color pattern consisting of dark and light diagonal bars on the body and bands on the fins (vs. body and fins without bars or bands); from P. albivermis, P. maccus, and P. purusiensis by the width of the dark bars being more or less the same of the light bars (vs. dark bars at least two or three times wider than light bars) and from P. changae by the absence of vermiculation on the head (vs. vermiculation present on head). The new species differs from P. gnomus by the orientation of the bars from posterodorsal to anteroventral direction (vs. anterodorsal to posteroventral direction), and from P. claustellifer by the orientation of the bands in the dorsal fin that are not parallel to the margin (vs. parallel to the margin). The barcoding region (COI) was sequenced for the new species, sequences were deposited in GenBank and were compared with congeners from other drainages. With regard to the current construction of a hydroelectric power plant (a so-called mega dam) in the Xingu River, herewith we increase knowledge of the river Xingu’s ichthyofauna and, thus improve the assessment of the impacts of that construction on the river.
Highlights
After some debate [1,2,3,4,5,6], Panaqolus Isbrücker & Schraml (2001) is a well-accepted genus separated from Panaque, the former genus of the Panaqolus-species described before 2001, by the absence of a ventrolateral keel on the caudal peduncle and postero-dorsal margin of the supraoccipital plate pointed
The forms most akin to P. tankei are a putative new species distributed in the Rio Negro basin [25] and P. claustellifer
Adult P. tankei have 3 to 4 dark bands in the dorsal fin which are orientated non-parallel to the margin of the fin, whereas P. claustellifer has only two bands and these are parallel to the margin of the fin [26]
Summary
After some debate [1,2,3,4,5,6], Panaqolus Isbrücker & Schraml (2001) is a well-accepted genus separated from Panaque, the former genus of the Panaqolus-species described before 2001, by the absence of a ventrolateral keel on the caudal peduncle (vs. present) and postero-dorsal margin of the supraoccipital plate pointed (vs. margin straight). Eleven species are recognized: Panaqolus albivermis Lujan, Steele & Velasquez, 2013; P. albomaculatus (Kanazawa, 1958), P. changae (Chockley & Armbruster, 2002), P. claustellifer (Tan, Souza & Armbruster, 2016), P. dentex (Günther, 1868), P. gnomus (Schaefer & Stewart, 1993), P. koko Fisch-Muller & Covain, 2012, P. maccus (Schaefer & Stewart, 1993), P. nix Cramer & Rapp Py-. Research-grant for fieldwork at the Xingu River, Fieldwork supported in part by NSF DEB-1257813 (CoPI Mark Sabaj Perez)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
