Simpsonichthys notatus

Costa, Wilson J. E. M. & Brasil, Gilberto C., 2004, Simpsonichthys radiosus sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the upper Rio Tocantins basin, central Brazil, Zootaxa 737, pp. 1-7 : 5-6

Key to species of the S. notatus group

1 Dorsal and anal fins pointed in male; 3 + 8–10 gill­rakers on first branchial arch; never bars on caudal fin in male; flank with rounded dark gray spots and without iridescent marks in female............................................................................................................. 2

­ Dorsal and anal fins rounded in male; 4 + 13 gill­rakers on the first branchial arch; caudal fin with blue bars in male; flank with dark gray bars, silver bars on median por­

tionandanterocentralblackblotchwithwidebluishsilvertolightgoldencontourinfemale ....................................................................................................................... S. ocellatus 2 Black blotch on anterocentral portion of flank in male................................................. 4

­ No black blotch on flank in male .................................................................................. 3

3 Distal dark gray to black stripe on anal fin in male; bright blue spots alternating with black interspace on dorsal­fin base in male; caudal fin brownish red in male; anal­fin origin between pleural ribs of vertebrae 7 and 9 in male, and 9 and 10 in female ......... ........................................................................................................................ S. stellatus

­ No distal stripe on male anal fin; bright blue dots on entire dorsal fin in male; caudal fin brownish yellow in male; anal­fin origin between pleural ribs of vertebrae 9 and 10 in male, and 11 and 12 in female ......................................................................... S. rufus

4 Anal fin with bright dots and no bars in male; no distal stripe on dorsal fin in male ... 6

­ Anal fin with oblique dark gray bars and no bright dots in male; bright blue stripe on distal edge of dorsal fin in male .................................................................................... 5

5 Caudal fin with blue dots and marginal blue stripe on dorsal half in male; blue dots over entire flank in male; tip of pectoral fin reaching between base of 5th and 7th analfin rays in male ................................................................................................ S. notatus

­ Caudal fin with light blue stripes parallel to fin rays, alternating with subdistal rounded light blue spots in male; tip of pectoral fin reaching between base of 1st and 3rd anal­fin rays in male ................................................................................ S. radiosus

6 Anterior portion of flank bright golden in male; humeral dark brown blotch in male ... ...................................................................................................................................... 7

­ Anterior portion of flank dark metallic yellow ochre in male; no humeral marks.......... ........................................................................................................................... S. similis

7 Five pelvic­fin rays; three purplish brown stripes on posterior portion of flank in male; no dark brown blotch on anteroventral portion of flank in male ................ S. trilineatus

­ Six pelvic­fin rays; purplish brown bars on posterior portion of flank in male; dark brown blotch on anteroventral portion of flank in male .................................. S. auratus