There are over 100 species recognised in the family Isodiametridae:[1]
Notes
^This genus is a junior homonym of Rimicola D. S. Jordan & Evermann, 1896, a genus of gobiesocid fishes, and thus needs to be replaced with a valid name.
^A binomial authority in parentheses indicates that the species was originally described in a different genus.
^Nilsson, K.S., Wallberg, A., & Jondelius, U. (2011). "New species of Acoela from the Mediterranean, the Red Sea, and the South Pacific." Zootaxa 2867: 1-31.