Bumblebee catfish

description

Description. Morphometric data summarized in Table 1. Head and anterior portion of body depressed, becoming laterally compressed from pectoral girdle towards caudal region. Greatest body depth at dorsal fin origin, greatest body width at pectoral fin base. Anterior dorsal profile of body straight or gently convex, ventral profile gently convex. Head broader than long, rounded in dorsal view. Eyes small, superior, orbital rim not free, covered by skin. Snout short, anterior nostril tubular, close to upper lip; posterior nostril with raised flap close to eye. Mouth wide and terminal. Premaxillary tooth patch rounded, without backward projecting angles; teeth small and villiform. Dentary tooth patch semicircular, longer than premaxillary tooth patch. Barbels thin, flattened in cross section. One maxillary and two mental pairs of barbels. Maxillary barbel longest, reaching base of pectoral spine. Lateral line incomplete, with 7 * (6), 8 (10), 9 (10), 10 (2), 11 (1) pores, reaching vertical line through posterior base of dorsal fin. Lateral line followed by isolated neuromasts as far posteriorly as vertical line through middle of adipose-fin. Gill membranes free. Gill rakers filiform; g

A new species of Microglanis Eigenmann, 1912 (Siluriformes, Pseudopimelodidae) from rio São Francisco basin, Brazil.

diagnosis

Diagnosis. The following combination of characters differs Microglanis leptostriatus from its congeners: light transverse stripe, located in occipital region between the opercular openings, thin and sinuous, sometimes discontinuous; pale region below dorsal and adipose fins mottled with brown spots; dark stripe in the axis of gill filaments in alcohol preserved specimens (figure 2). Microglanis leptostriatus is further distinguished from M. parahybae (table 1) and M. garavelloi, the closest species geographically, by having the following combination of characters: longer head length [28.3 - 32.1 % of SL (mean = 30.0) versus 25.5 - 28.5 % (mean = 27.2) and 25.2 - 30.2 (mean = 28.0), respectively], shorter dorsal spine length [11.7 - 14.9 % of SL (mean = 13.6) versus 14.1 - 18.1 % (mean = 16.0) and 11.3 - 19.0 (mean = 15.5)], shorter pectoral spine length [12.5 - 19.7 % of SL (mean = 17.4) versus 19.4 - 22.7 % (mean = 20.6) and 18.5 - 26.2 (mean = 22.1)].

A new species of Microglanis Eigenmann, 1912 (Siluriformes, Pseudopimelodidae) from rio São Francisco basin, Brazil.

discussion

Discussion Microglanis leptostriatus is distinguished from the other species in the genus by having pectoral and anal fins mottled or with relatively faint bands (vs. heavy dark bands in M. ater, M. pellopterygius and M. nigripinnis); trunk with dark brown saddles (vs. mottled in M. variegatus); caudal fin emarginate (vs. rounded in M. zonatus); tip of pectoral spine as distinct bony point (vs. tip of pectoral spine soft, not as distinct bony point, and implanted between two teeth, one straight, pointing outwards from anterior margin and the other curved, pointing backwards from posterior margin in M. secundus (sensu Mees, 1974 )); continuous portion of lateral line not reaching vertical through origin of adipose fin (vs. reaching vertical through adipose-fin origin in M. iheringi); caudal peduncle with faint to dark blotch irregularly shaped (vs. triangular in M. poecilus); caudal peduncle depth 11.3 - 17.7 % of SL (vs. 8.8 - 10.3 % of SL in M. eurystoma); trunk short relative to head (vs. long in M. cibelae); caudal fin lightly mottled with narrow vertical dark brown band across central portions of lobes (vs. caudal fin almost completely black with narrow vertical white band acro

A new species of Microglanis Eigenmann, 1912 (Siluriformes, Pseudopimelodidae) from rio São Francisco basin, Brazil.

distribution

Distribution. Microglanis leptostriatus is known from the tributaries of the middleupper course of rio Sao Francisco basin (figure 3).

A new species of Microglanis Eigenmann, 1912 (Siluriformes, Pseudopimelodidae) from rio São Francisco basin, Brazil.