Astyanax guaporensis

description

Description. Morphometric data presented in Table 1. Body somewhat compressed, moderately deep in larger specimens. Greatest body depth located at dorsal-fin origin. Dorsal profile convex from upper lip to vertical through anterior nostril, straight to slightly concave from latter point to base of supraoccipital spine, convex from that point to terminus of dorsal-fin base, straight from latter point to adipose fin, and concave along caudal peduncle. Ventral profile convex from lower lip to anal-fin origin, straight to slightly convex along anal-fin base, and slightly concave along caudal peduncle. Mouth terminal. Posterior terminus of maxilla located approximately at vertical through anterior margin of orbit. Tooth cusps aligned in straight series, central cusp longer. Premaxillary teeth in two rows, outer series with one (1), three (16) *, four (5) or five (1) tricuspid teeth; inner series with five (22) * or six (1) tri- to pentacuspid teeth. Maxilla with five (6), six (12) *, seven (3), eight (1) or nine (1) uni- to pentacuspid teeth; anteriormost tooth usually larger (Fig. 2). Dentary with four pentacuspid teeth (22) *, followed by a series of six to eight smaller teeth, uni- t

Redescription of Astyanax guaporensis Eigenmann, 1911 (Characiformes: Characidae), a small characid from the rio Madeira basin

diagnosis

Diagnosis. Astyanax guaporensis can be distinguished from all congeners, except A. leopoldi Géry, Planquette & Le Bail, A. orthodus Eigenmann, and A. superbus Myers by the presence of a series of transverse anteriorly directed V-shaped marks (vs. their absence). It can be distinguished from the aforementioned species by the absence of a black mark on the caudal peduncle (vs. its presence). Additionally, Astyanax guaporensis can be distinguished from all congeners, except A. angustifrons (Regan), A. aurocaudatus Eigenmann, A. gisleni Dahl, A. goyanensis (Miranda Ribeiro), A. guianensis Eigenmann, A. henseli Melo & Buckup, A. leopoldi Géry, Planquette & Le Bail, A. multidens Eigenmann, A. nasutus Meek, A. nicaraguensis Eigenmann, A. superbus Myers, and A. totae Haluch & Abilhoa by having five to nine maxillary teeth (vs. none to four). Astyanax guaporensis can be distinguished from the aforementioned species, except A. angustifrons, A. goyanensis, A. guianensis, A. leopoldi, A. nicaraguensis, and A. totae, by having 33 to 35 pored lateral-line scales (vs. more than 35). It can be distinguished from A. angustifrons, A. goyanensis, A. leopoldi, A. multidens, and A. nicaraguensis by hav

Redescription of Astyanax guaporensis Eigenmann, 1911 (Characiformes: Characidae), a small characid from the rio Madeira basin

discussion

Remarks. Astyanax guaporensis was described based on three specimens from the rio Guaporé, rio Madeira, under the original catalog numbers CM 3351, “ type ” (Fig. 1 a), and CM 3352, two “ cotypes ” (Fig. 1 b). Presently, the holotype and one of the paratypes are deposited at FMNH (54709 and 54710, respectively), but no further information about the other paratype is available. The CAS fish collection database indicates that CAS 68729 (IU 13268), represented by one specimen (approximately 28 mm SL), has the same data of the type series of A. guaporensis. Examination of its photograph allowed us to recognize it as conspecific with A. guaporensis and its original number is indeed CM 3352 (D. Catania, pers. comm.). Although not examined, specimen CAS 68729 is considered paratype of Astyanax guaporensis, along with FMNH 54710. The type locality given by Eigenmann (1911 a) in the original description of Astyanax guaporensis is “ Maciel, rio Guaporé ”. More detailed information is available in Eigenmann (1911 b), where it is written “ sixty miles above San Antônio de Guaporé ”. On the map containing J. Haseman’s route in South America (Eigenmann, 1915), Maciel is pointed as a rubber farm

Redescription of Astyanax guaporensis Eigenmann, 1911 (Characiformes: Characidae), a small characid from the rio Madeira basin

materials_examined

Material examined. Type specimens. Astyanax guaporensis. FMNH 54709 (holotype, 38.6 mm SL), rio Guaporé, Maciel (= rubber farm, near São Antônio de Guaporé, Rondônia, approximately 12 º 31 ’ S 63 º 30 ’ W), Brazil, J. D. Haseman, 23 – 26 Jul 1909. FMNH 54710 (1 paratype, 32.0 mm SL), same data of holotype. Non-type specimens. Astyanax guaporensis. Brazil, Rondônia. MZUSP 77888 (1, 30.7 mm SL), rio Guaporé, Forte Príncipe da Beira, Costa Marques, G. R. Kloss, 1987. UFRO-I 1542 (5, 29.2 – 34.9 mm SL), rio Jaciparaná, tributary of rio Madeira, Jaci Paraná district, Porto Velho, 9 ° 17 ’ 1 ” S 64 ° 23 ’ 57 ” W, C. Röpke, 12 Dec 2008. UFRO-I 1866 (2, 33.5 – 34.9 mm SL), Madalena lake, rio Jaciparaná, about 13 km of mouth, Jaci Paraná district, Porto Velho, 9 ° 17 ’ 0.9 ” S 64 ° 23 ’ 57.1 ” W, C. Röpke, 10 Dec 2008. UFRO-I 3643 (5, 30.6 – 34.0 mm SL), Três Praias, rio Jaciparaná, about 13 km of mouth, Jaci Paraná district, Porto Velho, 9 ° 28 ’ 20 ” S 64 ° 24 ’ 27.4 ” W, A. Ribeiro, 18 Mar 2012. UFRO-I 3660 (21, 31.9 – 41.3 mm SL), downstream of Pimenteiras do Oeste, rio Guaporé, 13 ° 31 ’ 23.2 ” S 61 ° 8 ’ 3 ” W, G. Torrente- Villara, 21 May 2010. UFRO-I 3666 (541, 26.1 - 43.3 mm SL, 5

Redescription of Astyanax guaporensis Eigenmann, 1911 (Characiformes: Characidae), a small characid from the rio Madeira basin