Leticia's Headstander

description

Description. Morphometrics of examined specimens presented in Table 7. Body elongate, moderately large (33.5 - 106 mm SL), compressed and moderately deep; greatest body depth slightly in advance of dorsal-fin origin. Dorsal profile of head and 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 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 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 43 - 53, 48.5. Pectoral-fin rays i, 12 - 16, 14.2. Tips of longest pectoral-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

description

Fig. 14 Charax leticiae Lucena, 1987: 140 (original description, type locality: Brazil, State of Pará, rio Tocantins, igarapé Urubu near Posto Trocará). - Oyakawa, 1996: 454 - 455 (listed in type catalog). - Lucena, 1989: 104 (in key to species). - Britski et al., 1999: 55, 2007: 75 (Pantanal de Mato Grosso, description). - Lucena & Menezes, 2003: 201 (maximum length; distribution). - Lopéz et al., 2003: 17 (Argentina, listed). - Casciotta et al., 2003: 84 (Laguna Iberiá, Argentina, listed). - Menni, 2004: 74 (Argentina, listed).

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 leticiae belongs in the species group having an orbital diameter 30.1 - 38.4 % of HL as opposed to C. caudimaculatus and C. notulatus that have orbital diameter 25 - 28.5 % of HL (Fig. 4). Charax leticiae can be distinguished from the other species of first group by having circumpeduncular scale rows (17 - 19) than C. apurensis and C. macrolepis (20 - 22), from C. michaeli by the number of scale rows from the dorsal-fin origin to the lateral line (16 - 17 vs. 18 - 20), from C. niger and C. gibbosus by the humeral spot distance 38 - 44 vs. 34.7 - 37.8 % of SL (Fig. 3), the number of transverse scale rows between the humeral spot and the supracleithrum 8 - 10 vs. 5 - 6 in C. niger and C. gibbosus. Charax leticiae differs from C. pauciradiatus in having more scale rows from the dorsal-fin origin to the lateral line (16 - 17 vs. 13 - 14). Charax leticiae differs from C. hemigrammus, C. condei, and C. stenopterus by having the lateral line complete (vs. lateral line incomplete), from C. rupununi by the number of scales around the caudal peduncle (17 - 19 vs. 12) and from C. tectifer, C. metae, and C. delimai by having the anal-fin origin always anterior to the vertical

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. Data from specimens collected in tributaries of the rio Paranaíba (upper rio Paraná basin in central Brazil) are not included since there is evidence that in recent years fishes from the rio Araguaia basin, where Charax leticiae occurs have been released into tributaries of rio Paranaíba (Zawadzki et al. 2008). No significant statistical differences in meristic and morphometric data were found through comparison of samples from the rios Tocantins / Araguaia and Paraguay basins.

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