Dusky Headstander

description

Anacyrtus sanguineus Cope, 1872: 266 (original description, type locality: Peru, ríoAmbyiacu). - Böhlke, 1984: 53 (listed in type catalog). - Fowler, 1907: 453 (lectotype designation). - Lucena & Menezes, 2003: 202 [synonym of Charax tectifer (Cope, 1870)]. Moralesia tectifer. - Fowler, 1943: 96 (Peru; original description). Moralesicus tectifera. - Fowler, 1958: 9. - Ortega & Vari, 1986: 91 (Peru, listed). Charax (Moralesia) tectifer tectifer. - Géry & Vu-Tan-Tuê, 1963: 243 (diagnostic characters in key). Charax tectifer. - Lucena, 1987: 60 (diagnosis; description; distribution; geographic variation). - Lucena, 1989: 104 (in key to species; Chang & Ortega, 1995: 5 (Peru, listed). - Lucena & Menezes, 2003: 202 (maximum length; distribution).

A taxonomic review of the species of Charax Scopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil

description

Description. Morphometrics of examined specimens presented in Table 15. Body elongate, moderately large (38 - 94 mm SL), compressed and moderately deep. Greatest body depth slightly in advance of dorsal-fin origin. Dorsal profile of head and body convex from tip of snout to anterior region of fontanel, concave from that point to base of supraoccipital spine, convex from that point to dorsal-fin origin, nearly straight along dorsal-fin base and straight to slightly convex from end of dorsal-fin base to caudal peduncle and slightly concave along caudal peduncle. Ventral profile of head and body convex from tip of lower jaw to anal-fin origin, nearly straight along anal-fin base and slightly concave from end of anal-fin base to beginning of procurrent rays. Snout pointed. Lower jaw included in upper jaw when mouth closed. Maxilla extending to vertical through posterior border of orbit. Dorsal-fin rays ii, 9 in all specimens, posterior most ray unbranched. Adipose fin present. Unbranched anal-fin rays iv or v, usually iv, branched rays 38 - 43, 40.3. Anterior anal-fin rays not bearing bilateral hooks in examined mature males. Pectoral-fin rays i, 12 - 16, 13.8. Tips of longest pectoral

A taxonomic review of the species of Charax Scopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil

diagnosis

Diagnosis. Charax tectifer differs from congeners except C. delimai, C. metae, some specimens of C. gibbosus, C. rupununi, and C. condei in bearing teeth on the ectopterygoid. Charax tectifer differs from C. condei in having the lateral line complete (versus incomplete) and from Charax gibbosus and C. rupununi in having the anal-fin origin along, or slightly posterior to, the vertical through the dorsalfin origin (vs. anterior to the dorsal-fin origin). Charax tectifer can be distinguished from C. delimai and C. metae by the absence (vs. presence) of the superficial neuromasts on body scales present in those two species (Figs. 1 and 2).

A taxonomic review of the species of Charax Scopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil

discussion

Remarks. No significant statistical differences in meristics and morphometrics and no differences in other morphological features were found among the samples from Colombia, Ecuador, and Peru.

A taxonomic review of the species of Charax Scopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil