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Isognomonidae comprise 1 genuses

Family Isognomonidae 
 1/1 Genus Isognomon: 16 Species

 -----1/16 Isognomon alatus
 -----2/16 Isognomon albisoror
 -----3/16 Isognomon australicus
 -----4/16 Isognomon bicolor
 -----5/16 Isognomon californicus
 -----6/16 Isognomon dunkeri
 -----7/16 Isognomon ephippium
 -----8/16 Isognomon incisus
 -----9/16 Isognomon isognomum
 -----10/16 Isognomon janus
 -----11/16 Isognomon legumen
 -----12/16 Isognomon nucleus
 -----13/16 Isognomon perna
 -----14/16 Isognomon radiatus
 -----15/16 Isognomon recognitus
 -----16/16 Isognomon vulselloides

16 Species in Isognomonidae 

(Extracted from WoRMS on February 2026)
NB: status "accepted" and "extant, not fossile-only"