Lyonsiidae is a

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

of small saltwater clams,

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

molluscs 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 taxon, extant species of molluscs are recognized. The number of fossil sp ...

in the

order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...

Anomalodesmata Anomalodesmata is an superorder of saltwater clams, marine bivalve molluscs. This grouping was formerly recognised as a taxonomic subclass. It is called a superorder in the current World Register of Marine Species, despite having no orders, to ...

Description

Members of this family have inequivalve, oblong

valves A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings ...

that are nearly equilateral. The right valve is more convex than the left, and there are usually no

teeth A tooth ( : teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, tear ...

. The ligament connecting the two valves is in an internal groove, and the hinge has a free ossicle.

Genera and species

The

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 ...

lists the following

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

and

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

in the family: *'' Allogramma'' Dall, 1903 **'' Allogramma elegans'' (Thiele & Jaeckel, 1931) **'' Allogramma formosa'' (Jeffreys, 1882) **'' Allogramma oahuense'' (Dall, 1913) *'' Bentholyonsia'' Habe, 1952 **'' Bentholyonsia teramachii'' (Habe, 1952) *'' Entodesma'' Phillips, 1845 **'' Entodesma beana'' (

d'Orbigny Alcide Charles Victor Marie Dessalines d'Orbigny (6 September 1802 – 30 June 1857) was a French naturalist who made major contributions in many areas, including zoology (including malacology), palaeontology, geology, archaeology and anthropol ...

, 1853) **'' Entodesma brasiliense'' (Gould, 1850) **'' Entodesma brevifrons'' (G.B. Sowerby I, 1834) **'' Entodesma cuneata'' (Gray, 1828) **'' Entodesma delicatum'' (Marincovich, 1973) **'' Entodesma elongatulum'' Soot-Ryen, 1957 **'' Entodesma fretalis'' (Dall, 1915) **'' Entodesma lucasana'' (Bartsch & Rehder, 1939) **'' Entodesma navicula'' ( A. Adams and Reeve, 1850) **'' Entodesma patagonicum'' (d'Orbigny, 1846) **'' Entodesma pictum'' (G. B. Sowerby I, 1834) **'' Entodesma saxicola'' (Baird, 1863) **'' Entodesma sechuranum'' Pilsbry & Olsson, 1935 **'' Entodesma solemyalis'' (Lamarck, 1818) **'' Entodesma weisbordi'' Macsotay & Campos, 2001 *'' Lyonsia'' Turton, 1822 **'' Lyonsia adriatica'' **''

Lyonsia alvarezii Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' d'Orbigny, 1846 **'' Lyonsia arcaeforme'' Martens, 1885 **'' Lyonsia arenosa'' (Moller, 1842) **''

Lyonsia argentea Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' Jeffreys, 1881 **'' Lyonsia bracteata'' (

Gould Gould may refer to: People * Gould (name), a surname Places United States * Gould, Arkansas, a city * Gould, Colorado, an unincorporated community * Gould, Ohio, an unincorporated community * Gould, Oklahoma, a town * Gould, West Virginia, a ...

, 1850) **'' Lyonsia californica''

Conrad Conrad may refer to: People * Conrad (name) Places United States * Conrad, Illinois, an unincorporated community * Conrad, Indiana, an unincorporated community * Conrad, Iowa, a city * Conrad, Montana, a city * Conrad Glacier, Washington ...

, 1837 **'' Lyonsia cucumerina'' Ivanova in Scarlato, 1981 **'' Lyonsia floridana''

, 1849 **''

Lyonsia granulifera Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' A. E. Verrill and Bush, 1898 **'' Lyonsia hyalina''

, 1831 **'' Lyonsia kawamurai'' Habe, 1952 **'' Lyonsia malvinensis'' d'Orbigny, 1846 **''

Lyonsia norvegica Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' ( J.F. Gmelin, 1791) **'' Lyonsia nuculaniformis'' Scarlato, 1981 **'' Lyonsia panamensis'' Dall, 1908 **'' Lyonsia praetenuis'' Dunker, 1882 **''

Lyonsia shimkevitch Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' (M. Sars, 1868) **'' Lyonsia striata'' ( Montagu, 1815) **'' Lyonsia taiwanica'' Lan & Okutani, 2002 **''

Lyonsia ventricosa Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' Gould, 1861 **''

Lyonsia vniroi Lyonsiidae is a family of small saltwater clams, marine bivalve molluscs in the order Anomalodesmata. Description Members of this family have inequivalve, oblong valves that are nearly equilateral. The right valve is more convex than the left, a ...

'' Scarlato, 1981

References

Bivalve families {{Bivalve-stub