Apteronotus mariae

description

Apteronotus mariae can be included in the “ A. albifrons species­group, ” defined by two pigmentation characteristics: a pale pigment patch on the caudal peduncle and highcontrast pale or white mid­dorsal stripe and mental patch, as proposed by Albert & Campos­da­Paz (1998) and Albert (2001). Apteronotus mariae can be distinguished from A. eschmeyeri, A. magdalenensis and A. rostratus by possessing a light brown body with small black spots distributed over the integument (vs. blotchy in the first two species, and uniformly brown to black in the third one). Description. Morphometrics for the holotype and paratype, plus two other specimens are presented in Table 1. Body laterally compressed, greatest body depth at abdominal cavity or slightly posterior to this area. Dorsal profile nearly straight. Lateral line extending to tail, absent on caudal fin. First anterior perforated scale above pectoral fin origin. Head laterally compressed, widest at opercular region and deepest at dorsal region; profile nearly straight, snout somewhat curved. Eyes small, located laterally on head, completely covered by a thin membrane. Mesethmoid short and narrow, its anterior tip reduced, flexed ventrall

Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)

description

“ Head 7.1 type, (6.3 paratype) in the length to the end of the anal; depth. 92 type, (. 94 paratype) in the length of the head; anal rays 173 type, (176 paratype); snout 2.7 type, (2.5 paratype) in the length of the head; eye 5.5 type, (5.7 paratype) in the interorbital, 5 type (6 paratype) in the head; width of head 2.4 type (2.5 paratype) in the depth. Head decurved; gape reaching to vertical from the eye; ground color light buff, body closely pigmented with minute dark chromatophores, much more abundant dorsally. An uninterrupted whitish streak along the median dorsal line from the end of the snout to the base of the caudal. ”

Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)

materials_examined

Holotype. FMNH 56774, 195.1 mm TL, female, Girardot, Colombia. Paratype — CAS 62345 (IU 13375), 274.5 mm TL, female. Additional material — IAVHP 3137, 284.3 ­ 330.0 mm TL, 1 male and 1 female; IAVHP 3998, 198.0 ­ 212.0 mm TL, 1 male and 1 female; IAVHP 3999, 185.0 ­ 201.0 mm TL, 3 females; IAVHP 4000, 223.0 mm TL, 1 female. Diagnosis. Included in the Apteronotidae by having a dorsal mid­sagittal electroreceptor organ and a caudal fin (Mago­Leccia, 1994; Albert & Campos­da­Paz, 1998; Albert, 2001). Apteronotus mariae shares the following diagnostic features with the subfamily Apteronotinae (Albert & Campos­da­Paz, 1998; Albert, 2001): gape of mouth large, extending to the posterior edge of the eye; maxilla rhomboid in lateral view; anterior surface of mesethmoid concave, and lateral process of ventral ethmoid robust. Included in the genus Apteronotus (sensu Albert & Campos­da­Paz, 1998; Albert, 2001) by possessing the following characters: white mid­dorsal stripe; white band circling the caudal fin base; and elongate posterior limb of the anguloarticular. Apteronotus mariae can be diagnosed within the genus Apteronotus by the following combination of features: lateral ethmoid presen

Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)

distribution

Distribution: Magdalena River basin, Colombia (de Santana, Maldonado-Ocampo, 2004).

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types