Rivulus sape, a new species of killifish (Cyprinodontiformes: Rivulidae) from the Paragua River system, Caroní River drainage, Guyana Shield, Venezuela

Abstract

A new species, Rivulus sape, is described from two tributaries of the upper Paragua River, Caroní River drainage, of the Guyana Shield in Venezuela. It is a small (all specimens examined less than 50 mm SL), apparently non-annual species that is distinguished from congeners in having the dorsal, anal, and pelvic fins short; adult males with a truncate caudal fin with the upper and lower borders black; and an iridescent blue, ovate spot on sides of the body above the pectoral fins. Neither adults nor juveniles have an ocellus at the dorsal junction of the caudal peduncle and caudal fin. Only one contact organ per scale on some scales along the sides of the body was observed.

Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba

“…The geographic distribution of these fishes covers Middle and South America, where it ranges from Mexico to Argentina, although there are some species inhabiting many Caribbean islands (Lasso-Alcala et al 2006). Particularly, a recent survey concerning the phylogeography of Cuban Rivulus (Ponce de Leon et al 2014) concluded that only one of the two species previously described in this genus (Rivulus cylindraceus Poey (1860), the type species) inhabited the whole archipelago.…”