There are four species:
Three species formerly classified in Lepisosteus are now assigned to the genus Atractosteus.
AN EMPIRICAL SYNTHETIC PATTERN STUDY OF GARS (LEPISOSTEIFORMES) AND CLOSELY RELATED SPECIES, BASED MOSTLY ON SKELETAL ANATOMY. THE RESURRECTION OF HOLOSTEI
Oct 04, 2010; ABSTRACT- The comparative osteology, phylogenetic relationships, and historical biogeography of all known fossil and living gars...