A molecular approach to the phylogenetic relationships of the western palaearctic Helicoidea (Gastropoda: Stylommatophora)

• Published in: Biological journal of the Linnean Society 2005-08, Vol.85 (4), p.501-512
• Main Authors: MANGANELLI, GIUSEPPE, SALOMONE, NICOLA, GIUSTI, FOLCO
• Format: Article
• Language: English
• Subjects: 16S rRNA; Bayesian inference; Biological and medical sciences; Biological evolution; Fundamental and applied biological sciences. Psychology; Genetics of eukaryotes. Biological and molecular evolution; Invertebrates; maximum likelihood; maximum parsimony; molecular phylogeny; Mollusca
• ISSN: 0024-4066; 1095-8312
• DOI: 10.1111/j.1095-8312.2005.00514.x

Molecular phylogenetic relationships among 45 members of the Helicoidea (Gastropoda: Stylommatophora) were examined using partial mitochondrial 16S rRNA sequences. Phylogenetic relationships were inferred using maximum parsimony, maximum likelihood and Bayesian methods. The reconstructed phylogenies showed a good degree of support for more recent branches, but gave little support to deeper nodes. Mitochondrial rDNA data further confirmed monophyletic status of helicids, recognized monachine hygromiid and bradybaenid clades and resolved a number of relationships in the helicelline hygromiids. With the respect to the latter assemblage, most of the anatomically based groups are confirmed, corroborating the diagnostic value of the dart‐sac complex and a close affinity between Ichnusomunda sacchii and species of the genus Cernuella. Nevertheless, some well resolved branches challenge previous systematic arrangements, grouping species previously placed in different arrangements. In particular, support was not found for the monophyly of helicelline hygromiids with pedal penial innervation. Possible explanations for these incongruencies are suggested. 16S sequence data are appropriate for studies of relationships within the different species groups and less so for recovery of more ancient radiations in the Helicoidea. It will be valuable to combine the 16S data with other gene sequences to estimate basal relationships. © 2005 The Linnean Society of London, Biological Journal of the Linnean Society, 2005, 85, 501–512.