Simpsonichthys constanciae

Costa, Wilson J. E. M., 2004, Simpsonichthys suzarti sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual fish from the Rio Pardo floodplains, northeastern Brazil, Zootaxa 468, pp. 1-7 : 5-6

Key to species of the S. constanciae group

1 No black spots on male flank; dorsal and anal fins of male with short filamentous rays, tip never reaching vertical through posterior margin of caudal fin; male with contact organs on flank scales and inner surface of upper pectoral­fin rays ............................ 2

­ Four longitudinal rows of round black spots on male flank; dorsal and anal fins of male with long filamentous rays, tip posteriorly surpassing posterior margin of caudal

fin; contact organs of flank and pectoral fin absent ................................ S. constanciae 2 Anal fin pointed in male; bars restricted to anterior portion of male flank; no bars on male anal fin................................................................................................................. 3

­ Anal fin rounded in male; reddish brown bars alternated with bright greenish blue bars on whole male flank; oblique brown bars on male anal fin ............................ S. suzarti

3 No bright dots on caudal and anal fins of male............................................................. 4

­ White dots on dorsal fin and concentrated on dorsal half of male caudal fin................. ................................................................................................................. S. bokermanni

4 Three horizontal stripes on posterior half of male flank; 4 + 14 gill­rakers on first branchial arch; 16­18 dorsal­fin rays in female; male unpaired fins yellow.......................... ........................................................................................................... S. perpendicularis

­ Usually no stripes, sometimes faint median stripe on posterior half of male flank; 3–4 + 11 gill­rakers on first branchial arch; 13–15 dorsal­fin rays in female; male unpaired fins red.......................................................................................................... S. rosaceus