Glass Characin

description

Anacyrtus pauciradiatus Günther, 1864 [original description, type locality: Brazil, State of Pará, rio Capin (= rio Capim)].

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 13. Body elongate, moderately large (36 - 100 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 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 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 slightly posterior of middle of orbital diameter. 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 - 51, 46.6. Sexually mature males with hooks on anterior

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

Charax pauciradiatus, Lucena, 1987: 48 (diagnosis; description; comparisons; distribution; geographic variation). - Lucena & Menezes, 2003: 104 (maximum length; distribution). Diagnosis. Charax pauciradiatus differs from C. apurensis and C. macrolepis by having the orbital diameter 30.4 - 38.7 % of HL (vs. 20 - 21 % of HL, Fig. 4) and from C. caudimaculatus and C. notulatus that have the orbital diameter 25 - 28.5 % of HL. Charax pauciradiatus can be distinguished from C. michaeli in the number of the scale rows from the dorsal-fin origin to to the lateral line (13 - 14 vs. 18 - 20) and from C. leticiae that has 16 - 18 scale rows from the dorsal-fin origin to the lateral line. Charax pauciradiatus differs from C. niger and C. gibbosus in having the humeral spot distance 38 - 44 % of SL (vs. 34.7 - 37.8 % of SL, Fig. 3). Charax pauciradiatus differs from C. hemigrammus, C. condei, and C. stenopterus in having the lateral line complete (vs. lateral line incomplete), from C. rupununi by the number of scales around the caudal peduncle (15 - 17 vs. 12) and from C. tectifer, C. metae, and C. delimai by having the anal-fin origin always located anterior to the vertical through the dorsal

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 pauciradiatus has been collected on ilha do Marajó, tributaries of the rio Capim, Pará; Paricatuba, Amazonas; rio Aripuanã, Mato Grosso; and rio Madeira basin, Rondônia, Brazil (Fig. 7). Specimens examined. Brazil, Pará: MZUSP 83763, 4, 48 - 83 mm SL, Castanhal, igarapé Apeú, rio Capim drainage, approximately 1 ° 24 ’ S 46 ° 06 ’ W; MZUSP 20562, 10, 38 - 83 mm SL, lago Maria Preta, rio Capim drainage; MZUSP 20552, 26, 36 - 96 mm SL, rio Capim; MZUSP 19538, 3, 86 - 100 mm SL, rio Apeú, Boa Vista, 1 ° 36 ’ S 47 ° 37 ’ W; MZUSP 33418, 9, 48 - 58 mm SL, rio Apeú, Boa Vista, 1 ° 36 ’ S 47 ° 37 ’ W; MCP 22537, 7, 52 - 90 mm SL, tributary of rio Capim and lagoa marginal between Paragominas and Tomé-Açu, about 56 km west of Paragominas, 2 ° 29 ’ 13 " S 47 ° 9 ’ 2 " W; MCP 22539, 1, 92 mm SL, Tomé-Açu, igarapé Urucare, on road between Tomé-Açu and Moju, about 49 km west of Tomé-Açu, 2 ° 29 ’ 13 " S 48 ° 31 ’ 31 " W; MCP 39032, 1, 112 mm SL, Rondônia, tributary of rio Madeira, on road BR- 364 between Ariquemes and Candeias do Jamari, 8 ° 47 ’ 23 " S 63 ° 37 ’ 37 " W. Amazonas: MZUSP 62114, 2, 55 - 56 mm SL, Paricatuba, 4 ° 40 ’ 31 " S 61 ° 55 ’ 33 " W; Mato Grosso: MZUSP

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