Tetragonopterus kuluene

description

Description. Morphometric data presented in Table 7. Body compressed and moderately elongate when compared with congeners. Greatest body depth at dorsal-fin origin. Dorsal profile slightly convex between tip of snout and vertical through middle of orbit; slightly concave from this point to end of occipital process and then convex from that point to dorsal-fin origin; straight or slightly convex along the dorsal-fin base to rear of adipose fin. Prepelvic region transversely flattened with distinct, longitudinally aligned lateral keels. Ventral profile slightly convex from lower lip to slightly behind vertical through pectoral-fin origin; convex from that point to anal-fin origin; straight along anal-fin base. Caudal peduncle with dorsal and ventral profiles slightly concave. Holotype Range Mean Standard length (mm) 44.4 34.4 – 63.9 46.1 Percentages of standard length Greatest depth 45.7 40.4 – 53.1 45.7 Predorsal length 50.9 48.0 – 53.4 51.3 Prepectoral length 30.0 27.9 – 32.3 30.3 Prepelvic length 48.4 46.6 – 53.8 49.9 Preanal length 65.3 62.5 – 71.8 65.8 Caudal peduncle depth 9.9 8.8 – 11.1 9.8 Caudal peduncle length 6.9 5.9 – 11.0 8.6 Pectoral-fin length 23.9 20.3 – 26.6 24.0 Pel

Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species

description

Tetragonopterus sp. Xingu: Melo et al., 2016: 709 – 717 (molecular phylogeny).

Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species

diagnosis

Diagnosis. Tetragonopterus kuluene is distinguished from all congeners, except T. anostomus, by having only one conspicuous humeral mark (vs. two conspicuous humeral marks). Tetragonopterus kuluene differs from T. anostomus by having a terminal mouth (vs. subsuperior mouth); it differs from T. anostomus and T. araguaiensis by the number of gill rakers on the lower (12 – 13) and upper (8 – 9) limbs of the first gill arch (vs. 17 – 20 and 10 – 12). Tetragonopterus kuluene differs from all congeners, except T. anostomus, T. denticulatus and T. juruena, by the presence of 5 – 6 principal dentary teeth (vs. 4) and by having thinner and sharper teeth (vs. more robust teeth). Tetragonopterus kuluene differs from T. denticulatus by having six scale rows between lateral line and dorsal-fin origin (vs. 7). In addition, T. kuluene differs from T. argenteus by having eight predorsal scales (vs. 11 – 17); it differs from T. carvalhoi by the presence of a rounded dark mark on the caudal peduncle (vs. a lozenge-shaped dark mark on the caudal peduncle). Tetragonopterus kuluene differs from T. rarus by the absence of dark longitudinal stripes on the trunk (vs. presence of stripes); it differs from

Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species

distribution

Distribution. Tetragonopterus kuluene is only known from the rio Xingu basin (Amazon basin, Brazil), where it occurs both at its upper portions, such as the Rio Culuene, Rio Suiá-Missu and Rio Curuá, as well as in the Volta Grande at the lower portion of the basin (Fig. 2 a).

Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species