Sinum Röding, 1798

Hollmann, Thomas Huelsken Daniel Tapken Tim Dahlmann Heike Wägele Cynthia Riginos Michael, 2012, Systematics and phylogenetic species delimitation within Polinices s. l. (Caenogastropoda: Naticidae) based on molecular data and shell morphology, Organisms Diversity & Evolution (New York, N. Y.) 12 (4), pp. 349-375 : 373

Genera Sinum Röding, 1798 and Tectonatica Sacco, 1890

The two Sinum species analysed in this study are sister taxa in the tree based on the concatenated data set and in the 18S gene analysis ( Fig. 2 , Fig. S1). The separated placement of Sinum together with genera of the Polinicinae matches previous contentions that the Sininae more likely represent a genus within the Polinicinae ( Finlay and Marwick 1937; Oyama 1969). However, the basal arrangement of Sinum species in both, the nuclear 18S tree and the mitochondrial COI tree, favour the hypothesis for the Sininae being a true subfamilial taxon independent of Polinicinae . This view appears to be contradicted by the basal arrangement of Tectonatica in the tree based on the concatenated data set, which, however, cannot be observed in either of the single analyses. Phylogenetic analyses of the entire family including more species and genera not investigated yet are needed to clarify these taxonomic puzzles.

Figures

Fig. 2 Phylogram obtained through Bayesian inference based on the concatenated data set (COI, 16S, 18S, 28S, H3) for a reduced number of taxa. Posterior probabilities are indicated at the nodes. Branches supported by values>0.95 are indicated in bold. Polytomies are due to the cut-off value specified for the consensus tree (50 % used as the default value in MrBayes)