Astyanax gymnogenys

description

Description. Morphometric data presented in Table 1 and range of meristic data in Table 2. Maximum size 186.2 mm SL. Body elongated and compressed, deepest at dorsal-fin origin or slightly ahead. Head dorsal profile convex from margin of upper lip to vertical immediately before nostrils, straight to vertical through center of orbit, slightly to sharply concave from this point to tip of supraoccipital process. Dorsal profile convex from this point to end of dorsal fin, and slightly convex or straight between dorsal and adipose fins. Ventral profile convex between tip of lower lip to isthmus, straight or slightly convex from this point to vertical through preopercle, straight or slightly convex from latter point to origin of pelvic fin, and straight from latter point to base of anal fin terminus. Caudal peduncle with dorsal and ventral margins straight or slightly concave. Mouth terminal or slightly subterminal. Maxillary bone extending beyond vertical through anterior margin of orbit, slightly curved and forming an angle of approximately 45 º relative to longitudinal axis of body. Posteroventral margin of third infraorbital distant from margin of preopercle, leaving a broad naked ar

Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010

diagnosis

Diagnosis. Astyanax gymnogenys differs from all congeners inhabiting the río de La Plata drainage and adjoining drainages (rio Ribeira de Iguape and coastal rivers in Paraná and Santa Catarina states) as follows. It differs from A. biotae Castro & Vari, A. bockmanni Vari & Castro, A. dissimilis Garavello & Sampaio, A. eigenmanniorum, A. endy Mirande, Aguilera & Azpelicueta, A. hermosus Miquelarena, Protogino & Lopes, A. lineatus, A. marionae, A. pirapuan Tagliacollo, Britzke, Silva & Benine, A. pynandi Casciotta, Almirón, Bechara, Roux & Diaz, A. ribeirae, and A. tumbayaensis Miquelarena & Menni by having 39 – 43 lateral line scales (vs. 38 or less lateral-line scales). It differs from A. aramburui Protogino, Miquelarena & López, A. bifasciatus Garavello & Sampaio, A. dissensus Lucena, Castro & Bertaco, A. henseli Melo & Buckup, A. ita Almirón, Azpelicueta & Casciotta, A. jordanensis Alcaraz, Pavanelli & Bertaco, A. leonidas Azpelicueta, Casciotta & Almirón, A. minor Garavello & Sampaio, A. paranae, A. totae Haluch & Abilhoa, and A. xiru Lucena, Castro & Bertaco by having the margin of the third infraorbital distant from the margin of preopercle, leaving a broad naked area between

Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010

distribution

Distribution. Astyanax gymnogenys is only known from the middle and lower rio Iguaçu basin (Fig. 2), states of Paraná and Santa Catarina, Brazil.

Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010

materials_examined

Material examined. 79 specimens (53.6 – 186.2 mm SL), all from Brazil, rio Iguaçu basin. Type-specimens. FMNH 54707, 64.9 mm SL, Santa Catarina, Porto União, rio Iguassú and flooded margins, swamps and lagoons, middle rio Iguaçu, ca. 26 ° 14 ’ 52 ” S 51 ° 05 ’ 25 ” W, 28 Dec 1908, J. D. Haseman. Holotype of Astyanax gymnogenys. FMNH 54708, 1, 65.1 mm SL, same data as previous. Paratype of Astyanax gymnogeny s. MZUSP 105954, 151.5 mm SL, Paraná, Laranjeiras do Sul, rio Iguaçu downstream from Salto Santiago dam, between Laranjeiras do Sul and Chopinzinho, lower rio Iguaçu, ca. 25 ° 39 ’ 11 ” S 52 ° 38 ’ 21 ” W, 5 – 10 Nov 1990, J. C. Garavello et al. Holotype of Astyanax longirhinus. MZUSP 105955, 1, 180.7 mm SL; NUP 10152, 15 of 16, 84.6 – 183.4 mm SL, Paraná State, Alto Alegre do Iguaçu, rio Iguaçu at Salto Caxias reservoir, lower rio Iguaçu, 25 ° 30 ’ 00 ” S 53 ° 24 ’ 59 ” W, 11 Jan 1994, Nupélia staff. Paratypes of Astyanax longirhinus. MZUSP 105956, 1, 170.3 mm SL, Santa Catarina State, Porto União at Colônia São Pedro, rio Timbó, middle rio Iguaçu, ca. 26 ° 25 ’ 49 ” S 50 ° 50 ’ 21 ” W, 20 – 22 nov 1986, J. C. Garavello et al. Paratype of Astyanax longirhinus. Non-types. Paraná

Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010