Erythrinus erythrinus (Bloch & Schneider, 1801)

Vera-Alcaraz, Héctor S., Rios, Gabriela & Emhart Vuletich, Jimmy D., 2017, Confirmation of the occurrence for seven fish species in Paraguay., Ichthyological Contributions of PecesCriollos 49, pp. 1-9 : 2-3

Erythrinus erythrinus (Bloch & Schneider, 1801)

Synonyms. Synodus erythrinus Bloch & Schneider, 1801 . Erythrinus salmoneus Gronow , in Gray, 1854. Erythrinus brevicauda Günther, 1864 . Erythrinus longipinnis Günther, 1864 .

Morphology. Head robust, snout short; anterior nare opening on mouth margin, posterior nare opening upside proximal tip of premaxilla; eye large, infraorbitals large, horizontally elongated; premaxilla and dentary with large canine and conical teeth, maxilla with small conical teeth only, distal tip of maxilla not surpassing posterior margin of eye. Body cylindrical; dorsal profile of body convex to dorsal-fin insertion, slightly concave to caudal peduncle; ventral profile of body convex. Large scales on body. Dorsal fin posterior to midpoint of body, adipose fin absent, low pectoral-fin insertion, pelvic-fin insertion opposite to dorsal-fin insertion, caudal fin rounded.

Measurements. Based in seven specimens. Head length 22.9-28.8% in SL. Eye diameter 4.0-6.2% in SL.

Counts. Based in seven specimens, unless otherwise indicated in parenthesis. Dorsal fin ii+9-10. Lateral line scales 32-34 (5), upper lateral series 3-4, lower lateral series 4, caudal peduncle series 16- 18 (5).

Coloration in alcohol. Head and body dark brown dorsally and pale brown ventrally. Irregular dark brown spots on posteriormost infraorbital; horizontal stripe posterior to eye, projecting backward diffusely on body; oblique stripe below eye. Body with dark brown irregular marbles on flanks; irregular dark brown spots on caudal peduncle. Dorsal, pectoral, pelvic, and caudal fin with numerous transverse stripes.

Remarks. First listed in Paraguay by Géry et al. (1987), no specimens analyzed.

Examined material. All from Paraguay: Departamento de Presidente Hayes: MNHNP 239 , alc. 7, 65.9-126.3 mm SL, Estancia La Golondrina, lugar pantanoso aprox. a 25 km al noroeste por el Río Confuso .