Simpsonichthys suzarti sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual fish from the Rio Pardo floodplains, northeastern Brazil Costa, Wilson J. E. M. Zootaxa 2004 468 1 7 4XG4P [525,699,1644,1670] Actinopterygii Rivulidae Simpsonichthys Animalia Cyprinodontiformes 4 5 Chordata species constanciae    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