Pygocentrus bilineatus; Eigenmann [C. H.] 1909:47  OPEFE EDUCATIONAL USE.WELCOME TO OPEFE ARCHIVES


Pygocentrus bilineatus

Eigenmann [C. H.] 1909:47

[Annals of the Carnegie Museum v. 6 (no. 1)

Genus Pygocentrus  Muller & Troschel
CURRENT STATUS: Synonym for Pristobrycon calmoni







Pygocentrus bilineatus sp. nov.

Type, 102 mm. (No. 1072 Carnegie Museum Catalog of Fishes.) Aruka River. Cotypes, 95 and no mm. Aruka River. (C. M. Cat. No. 1073; I. U. Cat. No. 11756.) Cotypes, 2 specimens, 43 and 56" mm. Creek in Moro Passage. (C. M. Cat. No. 1074; I. U. Cat. No. 11757.)


This species can best be described by means of a "Key " to the species so far recorded in British Guiana.


a. Abdominal serre 40; depth 15 ; D. 18; A. 33-35; lat. 1. 105; interorbital » little less than half the length of the head; second suborbital in contact with the preopercle. "niger"


aa. Abdominal seme less than 35.


b. Depth about 2 in the length; head heavy, about 3 in the length; D. 17-18; A. 30-33; lat. 1. 95-100; snout short; abdominal serrae 24, very blunt; interorbital nearly half the length of the head; a very narrow naked area on the cheek; origin of dorsal nearly equidistant from base of middle caudal ravs and front of eye; sides profusely spotted; a V-shaped black bar on the base of the caudal; margin of caudal dark; adipose fin rayed in the adult.  "piraya."


bb. Depth 1.5-1.75; head 3.12-3.5; D. 15 or 16; A. 32-34; lat. 1. 90; abdominal serrie 27-33! snout short, blunt, 4.33 in the head; eye 3.5-4; interorbital 2.33; a narrow lens-shaped naked area on the cheek, not more than one-fourth as wide as the second interorbital; origin of dorsal about equidistant from base of middle caudal rays and front of eye. Gillrakers minute, about 15 on the lower limb; a large diffuse humeral blotch; sides with numerous small spots; caudal in the adult with a narrow hyaline margin, the rest of the fin black; in the young hyaline, with a faint basal V-shaped bar. "scapularis.:


bbb. Depth 1 3/7 ; head 3.33; D. 15 or 16; A. 30-33; abdominal serrse 30 or 31 ; lateral line 73-76; snout pointed, equal to the eye, 3.5 in the head; interorbital 2.5 in the head; a lens-shaped naked area on the angle of the preopercle nearly half as high as the second suborbital; origin of dorsal but little nearer base of caudal than tip of snout; about 8 minute gillrakers on the lower arch; a prominent humeral spot; sides obscurely spotted, margin of caudal and a V-shaped basal band black; scales along. This specimen seems to have teeth on the palate, depth 1.75; D. 15; A. 33; serrae 30; base of anal and anal margin black; base of anal white: dorsal and adipose blackish. "bilineatus".

pg. 240. Pygocentrus bilineatus Eigenmann. (Plate LVI, fig. 2.)

Pygocentrus bilineatus Eigenmann, Ann. Carnegie Mus., VI, 1909, 47; Repts. Princeton Univ. Exp. Patagonia, III, 1910, 442.

Type, 102 mm. Aruka River. (C. M. Cat. No. 1072.) Cotypes, 95-110 mm. Aruka River. (C. M. Cat. No. 1073; I. U. Cat. No. 11756.)

Cotypes, 43-56 mm. Mora Passage. (C. M. Cat. No. 1074; I. U. Cat. No. 11757.)





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