Belongs within: Heterobranchia.Contains: Placostylinae, Bothriembryon, Bulimulinae. The Orthalicoidea are a group of relatively high-spired land snails characterised by the possession of genitalia lacking accessory structures and with an extremely long phallus complex. Most families of orthalicoids are found in the Americas (particularly the Neotropics) but members of the family Bothriembryontidae are found in Australasia (as… Continue reading Orthalicoidea