Charax delimai

description

Description. Morphometrics of holotype and all examined specimens presented in Table 4. Body elongate, moderately large (100 - 121 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 part 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 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 slightly beyond vertical through middle 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 41 - 45 (iv, 45), 41.9. Anterior anal-fin rays not forming differentiated distinct lobe and not bearing bilateral hooks in two adult males (100 and 102 mm SL). Pe

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 delimai along with C. tectifer, C. metae and some specimens of C. gibbosus, C. rupununi and C. condei are the only members of the genus bearing teeth on the ectopterygoid. Charax delimai differs from C. condei in having the lateral line complete (vs. incomplete). From Charax gibbosus and C. rupununi which have the anal-fin origin anterior to the vertical through the dorsal-fin origin in having the anal-fin origin on vertical or slightly posterior to, dorsalfin origin. Charax delimai can be readily distinguished from C. tectifer by the presence (vs. absence) of superficial neuromasts on body, with neuromasts dorso-ventrally arranged on trunk scales except those on the lateral line where neuromasts are absent (Fig. 1) and from C. metae by having fewer ectopterygoid teeth (3 - 15 vs. 20 - 50), more transverse scale rows between the humeral spot and the supracleithrum (10 - 12 vs. 7 - 9) and the humeral spot distance 48 - 51 % of SL (vs. 41.6 - 47 % of SL, Fig. 3).

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

distribution

Distribution. Charax delimai is known from the rio Tiquié, rio Negro basin, Brazil (Fig. 7).

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

etymology

Etymology. Charax delimai is named after Flávio César Thadeu de Lima for his great contributions to the knowledge of neotropical freshwater fishes and for collecting most of the specimens that served as the basis for the species description.

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