Calyptraeoidea, Lamarck, 1809

Simone, Luiz Ricardo L., 2024, New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review, Papéis Avulsos de Zoologia 64, pp. 1-104 : 16

Superfamily Calyptraeoidea

Family Trichotropidae

Remarks: The family Trichotropidae has been recently considered synonymous with Capulidae (e.g., Bouchet & Rocroi, 2005; MolluscaBase, 2023). However, this contradicts the results of phylogenetic studies based on a phenotypic database ( Simone, 2002, 2011), which show that Trichotropidae and Capulidae are distinct branches. Reuniting them would create a paraphyletic arrangement, so both families are maintained separately.

Conversely, at the superfamily level, Capuloidea, Calyptraeoidea , Hipponicoidea, and Vanikoroidea are considered different taxa (MolluscaBase, 2023). However, the same published studies ( Simone, 2002, 2011) demonstrate they are actually mixed in the same branch, supported by 27 ( Simone, 2002) or 21 ( Simone, 2011) synapomorphies.They are,thus, considered subdivisions of the same branch, simply named Calyptraeoidea .