Semi-slugs have a worldwide distribution and have evolved in several families; genera include: •
Palearctic and
Nearctic • family
Parmacellidae:
Cryptella • family
Vitrinidae:
Eucobresia, Semilimax, Vitrina, Vitrinobrachium • Asia - Pacific • family
Ariophantidae:
Parmarion,
Ratnadvipia, Varadia • family
Helicarionidae:
Attenborougharion,
Helicarion,
Howearion,
Ibycus,
Parmellops,
Ubiquitarion • Semi-slugs also exist but are exceptional in the
Camaenidae. •
Neotropics • family
Amphibulimidae:
Amphibulima,
Gaeotis • family
Xanthonychidae:
Cryptostrakon,
Semiconchula, Xanthonyx • family
Pleurodontidae:
Coloniconcha prima •
Tropical Africa • family
Urocyclidae:
Gymnarion ==See also==