# Lyonsiidae

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**Lyonsiidae** is a [family](/source/Family_(taxonomy)) of small saltwater clams, [marine](/source/Marine_(ocean)) [bivalve](/source/Bivalve) [molluscs](/source/Molluscs) in the [order](/source/Order_(biology)) [Anomalodesmata](/source/Anomalodesmata).

## Description

Members of this family have inequivalve, oblong [valves](/source/Valve_(mollusc)) that are nearly equilateral. The right valve is more convex than the left, and there are usually no [teeth](/source/Hinge_teeth). The ligament connecting the two valves is in an internal groove, and the hinge has a free ossicle.[2]

## Genera and species

The [World Register of Marine Species](/source/World_Register_of_Marine_Species) lists the following [genera](/source/Genus) and [species](/source/Species) in the family:[1]

- *[Allogramma](/source/Allogramma)* Dall, 1903 - *[Allogramma elegans](/source/Allogramma_elegans)* (Thiele & Jaeckel, 1931) - *[Allogramma formosa](/source/Allogramma_formosa)* (Jeffreys, 1882) - *[Allogramma oahuense](/source/Allogramma_oahuense)* (Dall, 1913)
- *[Bentholyonsia](/source/Bentholyonsia)* Habe, 1952 - *[Bentholyonsia teramachii](/source/Bentholyonsia_teramachii)* (Habe, 1952)
- *[Entodesma](/source/Entodesma)* Phillips, 1845 - *[Entodesma beana](/source/Entodesma_beana)* ([d'Orbigny](/source/D'Orbigny), 1853) - *[Entodesma brasiliense](/source/Entodesma_brasiliense)* (Gould, 1850) - *[Entodesma brevifrons](/source/Entodesma_brevifrons)* (G.B. Sowerby I, 1834) - *[Entodesma cuneata](/source/Entodesma_cuneata)* (Gray, 1828) - *[Entodesma delicatum](/source/Entodesma_delicatum)* (Marincovich, 1973) - *[Entodesma elongatulum](/source/Entodesma_elongatulum)* Soot-Ryen, 1957 - *[Entodesma fretalis](/source/Entodesma_fretalis)* (Dall, 1915) - *[Entodesma lucasana](/source/Entodesma_lucasana)* (Bartsch & Rehder, 1939) - *[Entodesma navicula](/source/Entodesma_navicula)* ([A. Adams](/source/Arthur_Adams_(zoologist)) and [Reeve](/source/Lovell_Augustus_Reeve), 1850) - *[Entodesma patagonicum](/source/Entodesma_patagonicum)* (d'Orbigny, 1846) - *[Entodesma pictum](/source/Entodesma_pictum)* (G. B. Sowerby I, 1834) - *[Entodesma saxicola](/source/Entodesma_saxicola)* (Baird, 1863) - *[Entodesma sechuranum](/source/Entodesma_sechuranum)* Pilsbry & Olsson, 1935 - *[Entodesma solemyalis](/source/Entodesma_solemyalis)* (Lamarck, 1818) - *[Entodesma weisbordi](/source/Entodesma_weisbordi)* Macsotay & Campos, 2001
- *[Lyonsia](/source/Lyonsia_(bivalve))* [Turton](/source/William_Turton), 1822 - *[Lyonsia adriatica](/source/Lyonsia_adriatica)* - *[Lyonsia alvarezii](/source/Lyonsia_alvarezii)* d'Orbigny, 1846 - *[Lyonsia arcaeforme](/source/Lyonsia_arcaeforme)* Martens, 1885 - *[Lyonsia arenosa](/source/Lyonsia_arenosa)* (Moller, 1842) - *[Lyonsia argentea](/source/Lyonsia_argentea)* Jeffreys, 1881 - *[Lyonsia bracteata](/source/Lyonsia_bracteata)* ([Gould](/source/Augustus_Addison_Gould), 1850) - *[Lyonsia californica](/source/Lyonsia_californica)* [Conrad](/source/Timothy_Abbott_Conrad), 1837 - *[Lyonsia cucumerina](/source/Lyonsia_cucumerina)* Ivanova in Scarlato, 1981 - *[Lyonsia floridana](/source/Lyonsia_floridana)* [Conrad](/source/Timothy_Abbott_Conrad), 1849 - *[Lyonsia granulifera](/source/Lyonsia_granulifera)* A. E. Verrill and Bush, 1898 - *[Lyonsia hyalina](/source/Lyonsia_hyalina)* [Conrad](/source/Timothy_Abbott_Conrad), 1831 - *[Lyonsia kawamurai](/source/Lyonsia_kawamurai)* Habe, 1952 - *[Lyonsia malvinensis](/source/Lyonsia_malvinensis)* d'Orbigny, 1846 - *[Lyonsia norvegica](/source/Lyonsia_norvegica)* ([J.F. Gmelin](/source/Johann_Friedrich_Gmelin), 1791) - *[Lyonsia nuculaniformis](/source/Lyonsia_nuculaniformis)* Scarlato, 1981 - *[Lyonsia panamensis](/source/Lyonsia_panamensis)* Dall, 1908 - *[Lyonsia praetenuis](/source/Lyonsia_praetenuis)* Dunker, 1882 - *[Lyonsia shimkevitch](/source/Lyonsia_shimkevitch)* (M. Sars, 1868) - *[Lyonsia striata](/source/Lyonsia_striata)* ([Montagu](/source/George_Montagu_(naturalist)), 1815) - *[Lyonsia taiwanica](/source/Lyonsia_taiwanica)* Lan & Okutani, 2002 - *[Lyonsia ventricosa](/source/Lyonsia_ventricosa)* Gould, 1861 - *[Lyonsia vniroi](/source/Lyonsia_vniroi)* Scarlato, 1981

## References

1. Gofas, Serge (2010). "Lyonsiidae". 10527. Retrieved 2012-01-05.

1. Gordon, W. J. [*Our Country's Shells: A Guide to the British Mollusca*](https://archive.org/details/ourcountrysshell00gordrich). London: Simpkin, Marshall, Hamilton, Kent & Co.

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Adapted from the Wikipedia article [Lyonsiidae](https://en.wikipedia.org/wiki/Lyonsiidae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Lyonsiidae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.