Eoacmaea
Eoacmaea is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, the true limpets.
Eoacmaea is the only genus in the family Eoacmaeidae, belonging to the superfamily Lottioidea.
Etymology
The generic name Eoacmaea is composed from the Eo that mean "early" in Greek and Acmaea, that is the genus of gastropod in family Lottiidae.Taxonomy
The family Eoacmaeidae was established by Nakano & Ozawa for the genus Eoacmaea.A cladogram based on sequences of mitochondrial 12S ribosomal RNA, 16S ribosomal RNA and Main subunit of [cytochrome c oxidase|cytochrome-c oxidase I] genes showing phylogenic relations of Patellogastropoda by Nakano & Ozawa and superfamilies based on World [Register of Marine Species]:
Eoacmaea is the most basal group within Patellogastropoda and Eoacmaea Bayesian [inference in phylogeny|have diversified] from other Patellogastropoda in Tethys Ocean in Triassic or Jurassic about 203 million years ago.