Integrative taxonomy of northeastern Atlantic top-shells of the genus Jujubinus Monterosato, 1884 (Gastropoda, Trochidae, Cantharidinae)

The northeastern Atlantic species of the gastropod genus Jujubinus Monterosato, 1884 (Trochidae, Cantharidinae) are reviewed based on an integrative taxonomic approach. Based on a comprehensive phylogenetic framework of cantharidine genera, it is suggested that the scope of the genus Jujubinus should be restricted to a radiation in the northeastern Atlantic and the Mediterranean, not including the tropical Indo-West Pacific species frequently ascribed to it. For Trochus montagui Wood, 1828, traditionally ascribed to Jujubinus, we did not find unequivocal evidence of it belonging in this clade, but rather we found some indication of a closer relationship with Clelandella miliaris (Brocchi, 1814) than with the Jujubinus clade. Thirteen morphospecies were checked against a DNA-barcoding dataset (cox1) and a molecular phylogenetic framework (cox1, 16S, single genes and combined datasets, analysed by Bayesian inference and Maximum Likelihood analyses). Twenty-two secondary species hypotheses were eventually retained. For fifteen of them an available name has been found;; seven are herein described as new.