Glass headstander

description

Description. Morphometrics of examined specimens presented in Table 5. Body elongate, moderately large (34 - 125.5 mm SL), compressed and moderately deep; greatest body depth slightly in advance of dorsal-fin origin. Dorsal profile of head an body slightly convex on tip of snout, straight from posterior border of posterior nostril to vertical line through posterior border of pupil, slightly concave from that point to base of supraoccipital spine, strongly 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 heaf and body convex from tip of lower jaw to anal-fin origin, nearly straight along anal-fin base and 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 posterior border of pupil. 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 45 - 56, 49.5. Single examined sexually mature male (MZUSP 10675, 64 mm SL) w

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 gibbosus belongs in a species group having orbital diameter 30.1 - 38.4 % of HL as opposed to C. caudimaculatus and C. notulatus that have an orbital diameter 25 - 28.5 % of HL (Fig. 4). Charax gibbosus differs from C. condei by having the lateral line complete (vs. incomplete). From C. and C. rupununi which have the anal-fin origin anterior to the vertical through the dorsal-fin origin in having the anal-fin origin posterior to the dorsal-fin origin. Charax delimai can be readily distinguished from C. tectifer by the presence (Fig. 1) (vs. absence, Fig. 26) of superficial neuromasts on the body with neuromasts dorso-vantrally arranged on trunk scales except the lateral line and from C. metae by having fewer ectopterygoid teeth (13 - 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 the SL vs. 41.6 - 47 % of the SL scale rows around the caudal peduncle (17 - 18) than C. apurensis and C. macrolepis (20 - 21), from C. michaeli by the number of scale rows from dorsal-fin origin to lateral line (15 - 16 vs. 18 - 20), from C. pauciradiatus by having more scale rows f

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. This species is known from the Nickerie, Brokopondo, Afobaka, and Courentyne Districts in Suriname; Wismar and Botanical Garden in Guyana; and rio Surumu, a tributary of rio Branco, Brazil (Fig. 7). Sexual dimorphism. Females lack the anal-fin hooks present in males and seem to grow larger. The single examined fully mature male is only 64 mm SL whereas examined sexually mature females ranged from 75 - 124.5 mm SL. 206 Taxonomic review of Charax Specimens examined. Suriname: MZUSP 38226, 1, 84 mm SL, Suriname, Corantyne River, Matappi Creek, approximately 4 ° 07 ’ N 57 ° 28 ’ W; MZUSP 38240, 5, 34 - 57 mm SL, Suriname, Nickerie District, Kapoeri Creek, about 4 km N of intersection with Corantyne River, approximately 4 ° 12 ’ N 57 ° 55 ’ W; MZUSP 10679, 3, 93 - 111 mm SL, Suriname, Zy Creek, not precisely located; MZUSP 10674, 3, 70 - 124.5 mm SL, Sara Creek, Brokopondo District, not precisely located; MZUSP 10675, 2, 37 and 64 mm SL, Marowijne Creek, 50 kilometers south of Afobaka, not precisely located. Brazil: MZUSP 5164, 1, 57 mm SL, Roraima, rio Surumu, tributary of rio Branco, 4 ° 05 ’ 28 " N 60 ° 43 ’ 04 " W.

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

Uso

Uso a nivel regional (Orinoquia): ornamental (Ajiaco-Martínez et al. 2012)

Peces de la cuenca del río Pauto, Orinoquia colombiana