Monophyly and taxonomy of the Neotropical seasonal killifish genus Leptolebias (Teleostei: Aplocheiloidei: Rivulidae), with the description of a new genus Author Costa, Wilson J. E. M. text Zoological Journal of the Linnean Society 2008 2008-05-31 153 1 147 160 https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2008.00380.x journal article 5387 10.1111/j.1096-3642.2008.00380.x 8085e8be-ef29-40ee-92f9-586de1ffd54a 0024-4082 4634939 LEPTOLEBIAS MYERS, 1952 Leptolebias Myers, 1952: 140 ( type species: Cynopoecilus marmoratus Ladiges, 1934 , by original designation; first proposed as a subgenus of Cynolebias Steindachner, 1876 ). Diagnosis: Distinguished from all other genera of the Cynopoecilina ( Notholebias , Cynopoecilus , and Campellolebias ) in having caudal fin elongate, longer than deep (vs. short, deeper than long), single anterior supraorbital neuromast ( Fig. 2 ) (vs. two or three), and distal third of dorsal fin in males without dark pigmentation (vs. extending pigmentation). Also distinguished from Notholebias by the absence of the second pharyngobranchial teeth, dermosphenotic and contact organs on male pectoral fin (vs. presence), opercular region with red reticulation in males (vs. red bars), and by having a wide, triangular basihyal ( Fig. 3 ) (vs. narrow, rectangular). Distribution: Species of Leptolebias are found in the temporary pools of broad coastal plains, in two areas, separated by about 500 km : (1) between Maricá and Vila de Cava, Rio de Janeiro state , south-eastern Brazil ( Fig. 4 ), and (2) between Itanhaém, southern São Paulo state , and river basins draining into Paranaguá bay, Paraná state , southern Brazil ( Fig. 5 ).