Trimusculus is the only genus in the family Trimusculidae.[5] Trimusculidae, the button snails, is the only family in the superfamily Trimusculoidea,[6] a
superfamily of false limpets. These are marine pulmonate gastropod mollusks in the
cladeEupulmonata.[6]
Trimusculids are not very closely related to the
siphonariids, another family of marine air-breathing false-limpets. The trimusculids are in the clade
Eupulmonata, and are quite closely related to air-breathing land snails.
Description
Trimusculids are sometimes known as "
button shells" or "button snails" because, especially in the eastern Pacific species Trimusculus reticulatus, the shells are small, white, almost perfectly circular in outline, only moderately elevated, and thus the shells are somewhat reminiscent of traditional white shirt buttons.
Trimusculus mammilaris [sic]: synonym of Trimusculus mammillaris (Linnaeus, 1758) (misspelling of mammillaris (Linnaeus, 1758))
Trimusculus niveus (Hutton, 1878): synonym of Trimusculus conicus (Angas, 1867)
Trimusculus semicorneus (Preston, 1908): synonym of Acmaea semicornea Preston, 1908: synonym of Discradisca semicornea (Preston, 1908)
References
^Schmidt F. C. (1818). Vers. Einth. Conch. [teste Marschall 1873, Nomen. zool., 143]; Moeller (1832). Isis (Oken), 1832: 132.
^WoRMS (2010). Trimusculus F.C. Schmidt, 1818. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at
http://www.marinespecies.org/aphia.php?p=taxdetails&id=138565 on 2011-01-09
^Gofas, S. (2010). Trimusculus afer (Gmelin, 1791). In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at
http://www.marinespecies.org/aphia.php?p=taxdetails&id=141705 on 2011-01-09
^Bouchet, P.; Gofas, S. (2010). Trimusculus mammillaris. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at
http://www.marinespecies.org/aphia.php?p=taxdetails&id=141706 on 2011-01-09
Poppe G. & Groh K. (2009) A new species of Trimusculus (Gastropoda: Eupulmonata: Trimusculidae) from the Central Philippines. Visaya 2(5): 91-93
Dayrat, B., Conrad, M., Balayan, S., White, T. R., Albrecht, C., Golding, R., Gomes, S. R., Harasewych, M. G., & Frias Martins, A. M. de. (2011). Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): new insights from increased taxon sampling. Molecular Phylogenetics and Evolution 59: 425-437.
External links
Wikimedia Commons has media related to Trimusculus.