''Trimusculus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of medium-sized air-breathing

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s or false

limpet Limpets are a group of aquatic snails with a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, ...

s, marine

pulmonate Pulmonata or pulmonates is an informal group (previously an order, and before that, a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group inclu ...

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

s in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button snails, is the only family in the superfamily Trimusculoidea, a

superfamily SUPERFAMILY is a database and search platform of structural and functional annotation for all proteins and genomes. It classifies amino acid sequences into known structural domains, especially into SCOP superfamilies. Domains are functional, str ...

of false limpets. These are marine pulmonate gastropod mollusks in the

clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...

Eupulmonata Eupulmonata is a taxonomic clade of air-breathing gastropod molluscs. The great majority of this group are land snails and slugs, but some are intertidal or inhabit coastal saltmarshes and mangroves. Possible synapomorphy of the group are gl ...

. Trimusculids are ''not'' very closely related to the siphonariids, another family of marine air-breathing false-limpets. The trimusculids are in the clade

, and are quite closely related to air-breathing land snails.

Description

Trimusculids are sometimes known as "

button A button is a fastener that joins two pieces of fabric together by slipping through a loop or by sliding through a buttonhole. In modern clothing and fashion design, buttons are commonly made of plastic but also may be made of metal, wood, or ...

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.

Species

Species within the genus ''Trimusculus'' include: * '' Trimusculus afer'' (Gmelin, 1791) * ''

Trimusculus carinatus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Dall, 1870) * '' Trimusculus conicus'' (Angas, 1867) - synonym: ''Gadinalea conica'' (Angas, 1867) * ''

Trimusculus costatus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Krauss, 1848) * ''

Trimusculus escondidus ''Trimusculus escondidus '' is a species of sea snail, a marine gastropod mollusk in the family Trimusculidae ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the ...

'' Poppe & Groh, 2009 * ''

Trimusculus goesi ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Hubendick, 1946) * ''

Trimusculus kurodai ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' Habe, 1958 * ''

Trimusculus mammillaris ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Linnaeus, 1758) * ''

Trimusculus mauritianus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine (ocean), marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae ...

'' (Martens, 1880) * ''

Trimusculus niveus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Hutton, 1883) - synonym: ''Gadinalea nivea'' Hutton, 1883 * ''

Trimusculus odhneri ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Hubendick, 1946) * ''

Trimusculus peruvianus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Sowerby II, 1835) * '' Trimusculus reticulatus'' (Sowerby II, 1835) * ''

Trimusculus stellatus ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' (Sowerby II, 1835) * ''

Trimusculus yamamotoi ''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae. ''Trimusculus'' is the only genus in the family Trimusculidae. Trimusculidae, the button sn ...

'' Habe, 1958Bouchet, P. (2010). ''Trimusculus yamamotoi'' Habe, 1958. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=414598 on 2011-01-09 ;Synonyms: * ''Trimusculus mammilaris'' ic 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 ''Discradisca'' is a genus of brachiopod Brachiopods (), phylum (biology), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs ...

'' (Preston, 1908)

References

* 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

Schmidt F.C. 1818, Versuch über die beste Einrichtung zur Aufstellung: Behandlung und Aufbewahrung der verschiedenen Naturkörper und gegenṣtände der Kunst, vorzüglich der Conchylien-Sammlungen, nebst kurzer Beurtheilung der conchyliologischen Systeme und Schriften und einer tabellarischen Zusammenstellung und Vergleichung der sechs besten und neuesten conchyliologischen Systeme. Gotha, J. Perth, 252 pp.

Gray, J. E. (1824). Zoological notices. On the characters of zoophytes. On Gadinia, a new genus of patelloid shells. On some new species of Ampullariadae (Marisa and Bithinia). The Philosophical Magazine and Journal. 63 (312): 274-277

Sowerby, G. B. I. (1835). Characters of and observations on new genera and species of Mollusca and Conchifera collected by Mr. Cuming. Proceedings of the Zoological Society of London. 3(25): 4-7; 3(26): 21-23; 3(27): 41-43; 46-47; 3(28): 49-51; 3(30): 84-85; 3(30): 93-96; 3(31): 109-110

redale, T. (1940). Marine Molluscs from Lord Howe Island, Norfolk Island, Australia, and New Caledonia. Australian Zoologist. 9: 429-443

Rehder, H. A. (1940). On the molluscan genus Trimusculus Schmidt 1818, with notes on some Mediterranean and West African Siphonarias. Proceedings of The Biological Society of Washington. 53: 67-69
{{Taxonbar, from1=Q3079543, from2=Q18548986, from3=Q18548995 Trimusculidae Gastropods described in 1818 Gastropod genera