[2] In 1963, a fresh shell of what was subsequently named Sphaerocypraea incomparabilis was dredged up by a Soviet trawler in the Gulf of Aden.

Fehse (2007)[4] has raised the tribe Eocypraeini to the status of the family Eocypraeidae, based on morphological research of the radulae, shell and animal morphology and molecular phylogeny research of the 16S ribosomal RNA gene.

[4] Dolin thought that Eocypraeidae was part of the subfamily Prionovolvinae Fehse, 2007 in the family Ovulidae.

[5] This line of thought was followed by Reijnen & van der Meij (2019)[6] and even for a while by the database WoRMS and Zvonareva et al., 2020,[7] each relying on a previous author.

Still he urges for a complete revision of the Eocypraeidae as well as the fossil Cypraeidae based exclusively on the type shells.