''Eoacmaea'' is a genus of

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

s or true

limpet Limpets are a group of aquatic snails that exhibit a conical shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning the various groups called "limpets" descended indep ...

s, marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s in the subclass

Patellogastropoda The Patellogastropoda, common name true limpet Limpets are a group of aquatic snails that exhibit a conical shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning th ...

, the true limpets. MolluscaBase eds. (2020). MolluscaBase. Eoacmaea T. Nakano & Ozawa, 2007. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=456551 on 2020-11-03 ''Eoacmaea'' is the only genus in the family Eoacmaeidae, belonging to the superfamily

Lottioidea Lottioidea is a superfamily of sea snails or limpets, marine gastropod mollusks in the clade Patellogastropoda, the true limpets.MolluscaBase (2018). Lottioidea Gray, 1840. Accessed through: World Register of Marine Species at: http://www.marin ...

Etymology

The generic name ''Eoacmaea'' is composed from the ''Eo'' that mean "early" in Greek and ''

Acmaea ''Acmaea'' is a genus of sea snails, specifically true limpets, marine gastropod mollusks in the family Acmaeidae, one of the families of true limpets.Bouchet, P.; Rosenberg, G.; Gofas, S. (2014). Acmaea Eschscholtz, 1833. Accessed through: ...

'', that is the genus of gastropod in family

Lottiidae Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Subfamilies 20 ...

Taxonomy

The family Eoacmaeidae was established by Nakano & Ozawa (2007) for the genus ''Eoacmaea''. A

cladogram A cladogram (from Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to d ...

based on sequences of mitochondrial 12S ribosomal RNA, 16S ribosomal RNA and cytochrome-c oxidase I (COI) genes showing phylogenic relations of Patellogastropoda by Nakano & Ozawa (2007) and superfamilies based on

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...

: ''Eoacmaea'' is the most

basal group In phylogenetics, basal is the direction of the ''base'' (or root) of a phylogenetic tree#Rooted tree, rooted phylogenetic tree or cladogram. The term may be more strictly applied only to nodes adjacent to the root, or more loosely applied to nodes ...

within Patellogastropoda and ''Eoacmaea'' have diversified from other Patellogastropoda in

Tethys Ocean The Tethys Ocean ( el, Τηθύς ''Tēthús''), also called the Tethys Sea or the Neo-Tethys, was a prehistoric ocean that covered most of the Earth during much of the Mesozoic Era and early Cenozoic Era, located between the ancient continents ...

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...

about 203 million years ago (limits are from 143 to 279 million years ago).

Species

Species within the genus ''Eoacmaea'' include: * ''

Eoacmaea albonotata ''Eoacmaea albonotata'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, ...

'' (Smith, 1901) * ''

Eoacmaea calamus ''Eoacmaea calamus'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, the ...

'' (Crosse & Fischer, 1864) * ''

Eoacmaea ceylanica ''Eoacmaea ceylanica'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, t ...

'' (E.A. Smith, 1911) * ''

Eoacmaea chamorrorum ''Eoacmaea chamorrorum'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, ...

'' (Lindberg & Vermeij, 1985) * ''

Eoacmaea conoidalis ''Eoacmaea conoidalis'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, ...

'' (Pease, 1868) * ''

Eoacmaea ivani ''Eoacmaea ivani'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae ''Eoacmaea'' is a genus of sea snails or true limpets, marine gastropod mollusks in the subclass Patellogastropoda, the t ...

'' (Christiaens, 1975) * '' Eoacmaea javanica'' (Nakano, Aswan & Ozawa, 2005) * '' Eoacmaea mauritiana'' (Pilsbry, 1891) * '' Eoacmaea omanensis'' (Christiaens, 1975) * '' Eoacmaea perfestiva'' (Faber, 2004) * '' Eoacmaea profunda'' (Deshayes, 1863) - type species * '' Eoacmaea pustulata'' (Helbling, 1779) * '' Eoacmaea semirubida'' (Dall, 1914)

References

{{Taxonbar, from=Q5381563