Hasemania crenuchoides

description

Description. Morphometric data in Table 2. Body deep and transversely rounded. Greatest body depth between tip of supraoccipital spine and dorsal-fin origin. Head moderately deep and rounded anteriorly in lateral profile; eye small. Dorsal profile of head distinctly convex from margin of upper lip to region of vertical through anterior nostril, nearly straight from that point to tip of supraoccipital spine. Dorsal profile of body slightly convex from tip of supraoccipital spine to dorsal-fin origin, posteroventrally inclined along dorsal-fin base, straight from terminus of dorsal-fin base to origin of caudal-fin rays. Ventral profile of head and body convex from margin of lower lip to analfin origin, straight and posterodorsally inclined along analfin base, nearly straight in caudal peduncle. Infraorbital series complete. Rhinosphenoid cartilaginous. Jaws equal, mouth terminal. Premaxillary dentition in two rows. Outer row with 3 (4), 4 * (25) or 5 (1) tricuspid teeth and inner row with 5 * (30) irregularly placed teeth with 5 cusps. Maxilla with 1 (4), 2 * (24), 3 (4), or 4 (1) tricuspid teeth along anterior dentigerous portion of bone. Dentary with single row of 4 * (27) or 5 (4)

A new Hasemania Ellis from the upper rio Paraná basin, with the redescription of Hasemania crenuchoides Zarske & Géry (Characiformes: Characidae)

diagnosis

Diagnosis. Hasemania crenuchoides is distinguished from its congeners by having a black vertically-elongate humeral spot (vs. absent, except from H. kalunga, H. nambiquara, H. piatan, and H. uberaba), ii, 8 dorsal-fin rays (vs. ii, 9, except H. hanseni, H. kalunga, H. melanura, H. nana, and H. uberaba); 11 - 14 branched anal-fin rays (vs. 16 - 19, except H. kalunga, H. melanura, H. nana, H. piatan, and H. uberaba), infraorbitals four and five (vs. a single ossification in the position occupied by infraorbitals four and five, except H. hanseni, H. maxillaris, H. melanura, H. nambiquara, and H. nana), and presence of scales covering the anal-fin base (vs. absent, except H. hanseni, H. maxillaris, H. melanura, H. nambiquara, H. nana, and H. uberaba). Additionally, H. crenuchoides differs from H. melanura by having maxillary teeth (vs. absent); from H. nambiquara by the absence of a broad black band in the midlateral line, from the humeral region to the caudalfin (vs. presence), and from H. piatan by possessing 19 principal caudal-fin rays (vs. 18).

A new Hasemania Ellis from the upper rio Paraná basin, with the redescription of Hasemania crenuchoides Zarske & Géry (Characiformes: Characidae)

distribution

Distribution. Hasemania crenuchoides seems to be restricted to the streams from the upper rio Paraná and upper rio Tocantins in the Distrito Federal, Brazil. This is the first reference to the species for the rio Tocantins basin.

A new Hasemania Ellis from the upper rio Paraná basin, with the redescription of Hasemania crenuchoides Zarske & Géry (Characiformes: Characidae)

materials_examined

Material Examined. Brazil: Distrito Federal: Upper rio Paraná drainage. DZSJRP 11039, 47 (4 c & s, 33.8 - 50.7 mm SL) 20.3 - 58.0 mm SL, and DZSJRP 14222, 4, 42.9 - 52.9 mm SL, córrego Paranoazinho, tributary of rio Sobradinho. MHNG 2594.044, 2 of 5 paratypes, 28.0 and 38.0 mm SL; and MZUSP 52732, 63.7 mm SL, holotype, male, córrego Planaltina. Upper rio Tocantins drainage. DZSJRP 14185, 20, 35.6 - 78.2 mm SL, ribeirão da Contagem, Contagem Biological Reserve.

A new Hasemania Ellis from the upper rio Paraná basin, with the redescription of Hasemania crenuchoides Zarske & Géry (Characiformes: Characidae)