Banjo catfish

description

Morphological description. Morphometric data is summarized in Table 1. Head and anterior part of body depressed, compressed from dorsal-fin origin to caudal-fin insertion. Maximum depth at dorsal-fin origin. Dorsal profile straight from snout tip to dorsal-fin origin, relatively depressed along dorsal-fin base, and relatively straight from this point to caudal-fin origin. Ventral profile of body, straight from lower-jaw to pectoral-fin origin, convex to pelvic-fin origin with the lowest point at the origin of the pelvic bone, then slanted dorsally to anal-fin origin and relatively straight form this point to caudal-fin base. Greatest width just anterior to pectoral-fin origin. Head triangular with a rounded snout. Eyes reduced (Fig. 3), located closer to snout tip than to supraoccipital protuberance, and covered with skin less pigmented than surroundings areas. Two nares, anterior nostril tubular, posterior one smaller and located closer to eyes than to anterior nostril. Maxillary barbel on side of snout, inserted just above rictus. Maxillary barbel reaching pectoral-fin base. Two pairs of mental barbels smaller than maxillary ones and located close to the mouth gape. The external

Re-description of Xyliphius barbatus (Siluriformes, Aspredinidae), with comments on osteology and distribution

diagnosis

Diagnosis. Xyliphius barbatus is distinguishable from the remaining species of genus by the following combination of characters: (1) seven to 11 retrorse dentations on posterior margin of pectoral-fin spine (vs. six in X. anachoretes and four or five in X. magdalenae); (2) 24 to 30 dendriform papillae on inferior lip (vs. 20 – 22 in X. magdalenae, 30 in X. sofiae, and 22 to 27 triangular papillae, with only the lateral ones branched in X. kryptos); (3) I, 3 or I, 4 dorsal-fin rays (vs. I, 5 in X. lepturus and X. melanopterus); (4) absence of dorsal pale band from snout tip to caudal-fin origin (vs. presence in X. anachoretes, X. magdalenae and X. melanopterus); (5) absence of a latero-dorsal band following the second row of tubercles on anterior part of body (vs. present in X. magdalenae and X. melanopterus); (6) eyes present and reduced (vs. absent in X. sofiae); (7) five to eight anal-fin rays (vs. nine in X. lepturus). The additional characters that distinguish Xyliphius barbatus from the remaining species of the genus are: papillae dendriform on lower lip with large branches (vs. papillae with minute branches on X. anachoretes); three dorsal procurrent rays (vs. two in X. anach

Re-description of Xyliphius barbatus (Siluriformes, Aspredinidae), with comments on osteology and distribution

distribution

Distribution. Including the new record from the San Francisco River, upper Bermejo River basin, Jujuy province and the previous records from the Paraná River, in Rosario (Santa Fe province), and in Chaco province (locality of X. lombarderoi), together with the records from the Paraguay River basin in Paraguay reported by Carvalho et al. (2017) and from the Pantanal in Brazil (Gimênes Junior and Rech 2022), the species exhibit a broad distribution in the Parana-Paraguay system. The new record of specimens from the San Francisco River, Upper Bermejo River basin, Jujuy province, is approximately 750 km in a straight line from the closest record in Tragadero River, Paraná River basin in Chaco Province (Fig. 9).

Re-description of Xyliphius barbatus (Siluriformes, Aspredinidae), with comments on osteology and distribution

description

first record from Uruguay info published in Loureiro et al. (2013)

CLOFFUY - update 5 - supplement to Checklist of the Freshwater Fishes of Uruguay.