RECORDS OF THE WESTERN AUSTRALIAN MUSEUM 34 038–050 (2019) DOI: 10.18195/issn.0312-3162.34(1).2019.038-050 Review of the fossil record of the Australian land snail genus Bothriembryon Pilsbry, 1894 (Mollusca: Gastropoda: Bothriembryontidae): new distributional and geological data Corey S. Whisson1,2* and Helen E. Ryan3 1 Department of Aquatic Zoology, Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia. 2 School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia 6150, Australia. 3 Department of Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia. * Corresponding author:
[email protected] ABSTRACT – The land snail genus Bothriembryon Pilsbry, 1894, endemic to southern Australia, contains seven fossil and 39 extant species, and forms part of the Gondwanan family Bothriembryontidae. Little published data on the geographical distribution of fossil Bothriembryon exists. In this study, fossil and modern data of Bothriembryon from nine Australian museums and institutes were mapped for the first time. The fossilBothriembryon collection in the Western Australian Museum was curated to current taxonomy. Using this data set, the geological age of fossil and extant species was documented. Twenty two extant Bothriembryon species were identified in the fossil collection, with 15 of these species having a published fossil record for the first time. Several fossil and extant species had range extensions. The geological age span of Bothriembryon was determined as a minimum of Late Oligocene to recent, with extant endemic Western Australian Bothriembryon species determined as younger, traced to Pleistocene age. Extant Bothriembryon species from the Nullarbor region were older, dated Late Pliocene to Early Pleistocene.