Simpsonichthys antenori

Wilson J. E. M. Costa, 2007, Taxonomic revision of the seasonal South American killifish genus Simpsonichthys (Teleostei: Cyprinodontiformes: Aplocheiloidei: Rivulidae)., Zootaxa 1669, pp. 1-134 : 95-96

Simpsonichthys antenori species group

Diagnosis

Differs from other assemblages within Simpsonichthys in possessing 5-10 pharyngobranchial teeth (vs. 1- 4) and anteromedian flap of preopercle vestigial or absent (vs. broad to slightly narrowed).

Included species

Simpsonichthys antenori (Tulipano), S. macaubensis Costa & Suzart, S. mediopapillatus Costa, S. ghisolfii Costa, Cyrino & Nielsen, S. igneus Costa, S. flavicaudatus (Costa & Brasil), S. flagellatus Costa, and S. janaubensis Costa.

Distribution

Rio Jaguaribe basin and adjacent coastal basins, and middle rio São Francisco basin (Fig. 1).

Key to species of the S. antenori group

1a. Dorsal and anal-fin filaments reaching between central and posterior portion of caudal fin, or surpassing it in males; unpaired fins pink, yellow or orange in males...............................................................2

1b. Dorsal and anal-fin filaments short in males, reaching caudal-fin base; unpaired fins dark bluish gray in males.................................................................................................................................. S. antenori

2a(1a). Filamentous rays of dorsal and anal fins of moderate length in males, tip of each fin reaching posterior portion of caudal fin...............................................................................................................................3

2b(1a). Filamentous rays of dorsal and anal fins rather long in males, tip of each fin extending beyond posterior margin of caudal fin.......................................................................................................................5

3a(2a). Urogenital papilla long in males, notably conspicuous in lateral view.................................................4

3b(2a). Urogenital papilla short in males, almost imperceptible in lateral view................ ................................................................................................................. S. macaubensis

4a(3a). No contact organs on flank in males; a median neuroma........................................... S. mediopapillatus

4b(3a). Contact organs on anteroventral portion of flank in males; no median neuromast on posterior rostral series...................................................................................................................................... S. ghisolfii

5a(2b). Six pelvic-fin rays; flanks with gray bars and few or no light dots in males; anal fin pink anteriorly and yellow posteriorly, with gray distal stripe in males................................................................................6

5b(2b). Seven pelvic-fin rays; flanks of males without bars or sometimes hardly visible only in preserved specimens, and with numerous light dots; anal fin yellow, with orange subdistal stripe and black distal stripe in males............................................................................................................................ S. igneus

6a(5a). Pectoral-fin contact organs pronounced in males; dorsal profile of head conspicuously concave; anterobasal portion of dorsal fin with short light stripes alternating with dark gray to black areas. .................................................................................................................................................................7

6b(5a). Pectoral-fin contact organs minute in males; dorsal profile of head nearly straight; anterobasal portion of dorsal fin with small light spots, sometimes slightly elongated............................... S. flavicaudatus

7a(6a). Elongated light blue spots restricted to anterior portion of dorsal-fin base in males; anal-fin base in males 39.0-45.2% SL; body depth in combined sexes 37.0-42.7% SL; caudal-peduncle depth in combined sexes 13.4-16.6% SL............................................................................................... S. flagellatus

7b(6a). Elongated light blue spots along entire dorsal-fin base in males; anal-fin base in males 34.4-38.4% SL; body depth in combined sexes 30.7-38.4% SL; caudal-peduncle depth in combined sexes 11.7- 14.3% SL......................................................................................................................... S. janaubensis