title: Deep molecular divergence and exceptional morphological stasis in dwarf cannibal snails Nata sensu lato Watson, 1934 (Rhytididae) of southern Africa.
abstract: The genus Nata Watson, 1934 is a southern African endemic belonging to the Gondwanan family of carnivorous snails, Rhytididae. We present a molecular phylogeny of the genus based on two mitochondrial (16S and COI) and two nuclear genes (ITS2 and 28S RNA), and complement this with an appraisal of morphological characters relating to both the shell and soft parts. We identify four reciprocally monophyletic lineages for which valid names are already available, plus two undescribed species restricted to the Albany Thicket Biome. We show that Nata sensu lato may not be monophyletic. Rather there exist two deep lineages within Nata s.l., one lineage potentially sister to a clade dominated by the Australian and New Zealand radiation, and the other occupying a basal position within Rhytididae. Accordingly we recommend a revision recognising two genera, namely Nata s.s. and Natella respectively. Despite deep molecular divergences within Nata s.s., phenotypic evolution has been remarkably conserved, and contrasts greatly with that exhibited across other major lineages within the Rhytididae.
authors.affiliation: Sciences Department, Museum Victoria, Carlton Gardens 3053, Australia. Electronic address: amoussalli@museum.vic.gov.au.
authors.forename: Adnan
authors.initials: A
authors.lastname: Moussalli
authors.affiliation: Department of Mollusca, KwaZulu-Natal Museum, P. Bag 9070, Pietermaritzburg 3200, South Africa; School of Life Sciences, University of KwaZulu-Natal, P. Bag X01, Scottsville 3209, South Africa.
authors.forename: David G
authors.initials: DG
authors.lastname: Herbert
mesh_terms: D000220:Adaptation, Biological / Q000235:genetics; D000353:Africa, Southern; D000818:Animals; D001315:Australia; D005075:Biological Evolution; D002190:Cannibalism; D005260:Female; D049810:Genetic Speciation; D009520:New Zealand; D010802:Phylogeny; D012339:RNA, Ribosomal, 28S / Q000235:genetics; D012908:Snails / Q000033:anatomy & histology* / Q000145:classification* / Q000235:genetics*
chemical_list: D012339:RNA, Ribosomal, 28S
keywords: Mitochondrial; Morphology; Nata; Nuclear; Phylogeny; Rhytididae