Species in tribe Odontostomini have the aperture obstructed by internal lamellae, folds or teeth (rarely absent by degeneration); the base is perforate
or has an umbilical suture; and the genitalia are extremely lengthened. Jaw either plaited or solid.[7][unreliable source?]
Odontostomini is clearly a natural group of genera, confined to South America east of the Andes, and with the exception of some species, south of the Amazon. That the whole series had its inception in a form in which the characteristic apertural teeth had already been developed, is demonstrated by
the fact that these lamella and folds are clearly homologous throughout the species of the several genera. It follows from this that the toothless forms, such as Moricandia, are secondarily so, by degeneration of the teeth of their ancestors. Many species show the various stages of tooth
degeneration.[7][unreliable source?]
This article incorporates public domain text from the reference[7]
^Breure A., Groenenberg D. & Schilthuizen M. (2010). "Gondwana revisited: New insights in the phylogenetic relationships within the Orthalicoidea (Mollusca, Stylommatophora)". poster. PDFArchived 2012-03-09 at the Wayback Machine.
^ abcBreure A. S. H., Groenenberg D. S. J. & Schilthuizen M. (2010). "New insights in the phylogenetic relations within the Orthalicoidea (Gastropoda, Stylommatophora) based on 28S sequence data". Basteria74(1-3): 25-31.
^ abcdefghijklBreure A. S. H. & Ablett J. D. (2012) "Annotated type catalogue of the Bothriembryontidae and Odontostomidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London". ZooKeys182: 1-70. doi:10.3897/zookeys.182.2720.