Eoacmaea
Encyclopedia
Eoacmaea is a genus of sea snail
Sea snail
Sea snail is a common name for those snails that normally live in saltwater, marine gastropod molluscs....

s or true limpet
Limpet
Limpet is a common name for a number of different kinds of saltwater and freshwater snails ; it is applied to those snails that have a simple shell which is more or less conical in shape, and either is not spirally coiled, or appears not to be coiled in the adult snails.The name limpet is most...

s, marine
Marine (ocean)
Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 gastropod mollusks in the clade
Clade
A clade is a group consisting of a species and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological...

 Patellogastropoda
Patellogastropoda
Patellogastropoda, common name true limpets and historically called Docoglossa, is a major phylogenetic group of marine gastropods, seen either as a clade or as a taxonomic order.-Taxonomy:Patellogastropoda was proposed by David R...

, the true limpets.

Eoacmaea is the only genus in the family Eoacmaeidae, that is the only family in the superfamily Eoacmaeoidea.

Etymology

The generic name Eoacmaea is composed from the Eo that mean "early" (from what language?) and Acmaea, that is the genus of gastropod in family Lottiidae
Lottiidae
Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda .- 2005 taxonomy :...

.

Taxonomy

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

A cladogram
Cladogram
A cladogram is a diagram used in cladistics which shows ancestral relations between organisms, to represent the evolutionary tree of life. Although traditionally such cladograms were generated largely on the basis of morphological characters, DNA and RNA sequencing data and computational...

 based on sequences of mitochondrial 12S ribosomal RNA
12S ribosomal RNA
Mitochondrially encoded 12S RNA is a 959 nt long mitochondrial ribosomal RNA . In humans, 12S is encoded by the MTRNR1 gene.All animal mitochondria genomes contain 37 genes, 2 rRNA, 22 tRNA and 13 mRNA...

, 16S ribosomal RNA
16S ribosomal RNA
16S ribosomal RNA is a component of the 30S subunit of prokaryotic ribosomes. It is approximately 1.5kb in length...

 and cytochrome-c oxidase I
Main subunit of cytochrome c oxidase
Cytochrome C and Quinol oxidase polypeptide I is main subunit of cytochrome c oxidase complex.Cytochrome c oxidase is a key enzyme in aerobic metabolism. Proton pumping heme-copper oxidases represent the terminal, energy-transfer enzymes of respiratory chains in prokaryotes and eukaryotes...

 (COI) genes showing phylogenic relations of Patellogastropoda by Nakano & Ozawa (2007) and superfamilies based on World Register of Marine Species
World Register of Marine Species
The World Register of Marine Species is a database that hopes to provide an authoritative and comprehensive list of names of marine organisms. The content of the registry is edited and maintained by scientific specialists on each group of organism. These taxonomists control the quality of the...

:
Eoacmaea is the most basal group
Basal (phylogenetics)
In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group forms an outgroup to the rest of the clade, such as in the following example:...

 within Patellogastropoda and Eoacmaea have diversified
Bayesian inference in phylogeny
Bayesian inference in phylogeny generates a posterior distribution for a parameter, composed of a phylogenetic tree and a model of evolution, based on the prior for that parameter and the likelihood of the data, generated by a multiple alignment. The Bayesian approach has become more popular due...

 from other Patellogastropoda in Tethys Ocean
Tethys Ocean
The Tethys Ocean was an ocean that existed between the continents of Gondwana and Laurasia during the Mesozoic era before the opening of the Indian Ocean.-Modern theory:...

 in Triassic
Triassic
The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

 or Jurassic
Jurassic
The Jurassic is a geologic period and system that extends from about Mya to  Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

 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
    Eoacmaea albonotata is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Smith, 1901)
  • Eoacmaea calamus
    Eoacmaea calamus
    Eoacmaea calamus is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Crosse & Fischer, 1864)
  • Eoacmaea ceylanica
    Eoacmaea ceylanica
    Eoacmaea ceylanica is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (E.A. Smith, 1911)
  • Eoacmaea chamorrorum
    Eoacmaea chamorrorum
    Eoacmaea chamorrorum is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Lindberg & Vermeij, 1985)
  • Eoacmaea conoidalis
    Eoacmaea conoidalis
    Eoacmaea conoidalis is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Pease, 1868)
  • Eoacmaea ivani
    Eoacmaea ivani
    Eoacmaea ivani is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Christiaens, 1975)
  • Eoacmaea javanica
    Eoacmaea javanica
    Eoacmaea javanica is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Nakano, Aswan & Ozawa, 2005)
  • Eoacmaea mauritiana
    Eoacmaea mauritiana
    Eoacmaea mauritiana is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Pilsbry, 1891)
  • Eoacmaea omanensis
    Eoacmaea omanensis
    Eoacmaea omanensis is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Christiaens, 1975)
  • Eoacmaea perfestiva (Faber, 2004)
  • Eoacmaea profunda
    Eoacmaea profunda
    Eoacmaea profunda is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets.Eoacmaea profunda is the type species in the genus Eoacmaea....

    (Deshayes, 1863) - type species
  • Eoacmaea pustulata
    Eoacmaea pustulata
    Eoacmaea pustulata is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Helbling, 1779)
  • Eoacmaea semirubida
    Eoacmaea semirubida
    Eoacmaea semirubida is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Eoacmaeidae, one of the families of true limpets....

    (Dall, 1914)
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