One-spine Pearlfish

description

first record from Uruguay info NEW published in Serra et al. (2022)

CLOFFUY - update 5 - supplement to Checklist of the Freshwater Fishes of Uruguay.

description

Description Morphometric data appear in Table 7. Males larger than females, largest male examined 35.6 mm SL, largest female 32.2 mm SL. Dorsal profile slightly convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Greatest body depth at level of pelvic-fin base. Body deep and compressed. Snout blunt and jaws short. Tip of both dorsal and anal fins rounded. Anteromedian rays of anal fin of females lengthened, anal fin shape nearly triangular; distal portion of anal fin thickened in females. Caudal fin rounded. Pectoral fins elliptical, posterior margin on vertical between base of 3 rd and 5 th anal-fin rays in males, and between pelvic-fin base and urogenital papilla in females. Tip of each pelvic fin reaching between base of 3 rd and 4 th anal-fin ray. Medial pelvic-fin membranes about 75 - 90 % coalesced. Entire urogenital papilla attached to anal fin in males. Dorsal-fin origin on vertical slightly posterior to anal-fin origin in males, between base of 2 nd and 4 th anal-fin ray, and between neural spines of 7 th and 9 th vertebrae. In females, dor

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.

diagnosis

Diagnosis Differs from all congeners except A. bellottii, A. apaii, and A. melanoorus, in having the entire urogenital papilla attached to the anal fin in males (vs. urogenital papilla free from the anal fin). Distinguished from A. bellottii and A. apaii in having fewer teeth on the second pharyngobranchial; from A. apaii in having fewer supraorbital neuromasts (17 - 18 vs. 20 - 24), fewer preopercular plus mandibular neuromasts (39 - 41 vs. 43 - 47), and anal-fin origin between pleural ribs of 7 th and 9 th vertebrae in males, between pleural ribs of 9 th and 11 th vertebrae in females (vs. between pleural ribs of 5 th and 7 th vertebrae in males, between pleural ribs of 7 th and 8 th vertebrae in female); from A. bellottii by possessing a more slender body in males (body depth 36.6 - 39.8 % SL vs. 40.1 - 46.1 % SL) and by usually having more vertical rows of bright dots on the flanks in males (11 - 18 vs. 7 - 12); from A. melanoorus by possessing pelvic-fin bases united at about 75 - 90 % of their medial margins (vs. about 10 - 25 %), and distinct color patterns: flanks dark bluish gray, with vertical rows of bright greenish blue dots in males (vs. light bluish gray bars alternat

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.

distribution

Distribution Rio Jaguarao drainage, lagoa Mirim system, southern Brazil (Fig. 11).

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.