Annual Tropical Killifish

materials_examined

Material examined: Brazil, Rio de Janeiro: CAS (SU) 36522, six paratypes; MNRJ 11301, 3; base of serra de Petrópolis; MNRJ 10621, holotype of C. nanus, 20.3 - mm SL, MNRJ 10622, 1, MZUSP 25229 / 30, two paratypes of C. nanus; road between Cava and Tinguá, about 8 km from Cava, Nova Iguaçu. Diagnosis: Distinguished from all congeners, except L. citrinipinnis, in having dorsal-fin origin in vertical between base of seventh and ninth anal-fin rays (vs. between base of second and sixth anal-fin rays). It differs from L. citrinipinnis by having caudal fin lanceolate (vs. elliptical), dark-red stripe on distal margin of dorsal and anal fins, and dorsal and ventral margin of caudal fin in males (vs. reddish brown pigmentation diffuse). Remarks: Redescribed by Costa & Lacerda (1988). Distribution: Estrela and Iguaçu river basins, both draining into Guanabara bay, Rio de Janeiro state, south-eastern Brazil (Fig. 5). Habitat and conservation: Not collected since 1981, so possibly extinct. Its area of occurrence was formerly occupied by dense rainforest, but is now highly urbanized. Leptolebias opalescens was collected both in open vegetation and in forest borders, sometimes sympatric to L. s

Monophyly and taxonomy of the Neotropical seasonal killifish genus Leptolebias (Teleostei: Aplocheiloidei: Rivulidae), with the description of a new genus