Original paper

Critical analysis of subgeneric taxa of the Subfamily Caecinae (Caenogastropoda: Caecidae)

Absalao, Ricardo Silva; Pizzini, Mauro


A conchological analysis of the subgenera of Caecum was performed,considering the variations among the different growth stages.Only Meioceras is considered a valid taxon,since there is a broad superposition of diagnostic conchological characters among subgenera {Caecum,Brochina,Elephantulum and Fartulum).Bambusum shows no character supporting it as a distinct taxon from Elephantulum,and their differences are attributed to individual rather than subgeneric characteristic.The generic status of Meioceras is supported by its helicoidal growth pattern beginning in the second stage.