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, and there are usually no teeth. 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 lists the following genera and species 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, 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 d'Orbigny, 1846 Lyonsia arcaeforme Martens, 1885 Lyonsia arenosa (Moller, 1842) Lyonsia argentea Jeffreys, 1881 Lyonsia bracteata (Gould, 1850) Lyonsia californica Conrad, 1837 Lyonsia cucumerina Ivanova in Scarlato, 1981 Lyonsia floridana Conrad, 1849 Lyonsia granulifera A. E. Verrill and Bush, 1898 Lyonsia hyalina Conrad, 1831 Lyonsia kawamurai Habe, 1952 Lyonsia malvinensis d'Orbigny, 1846 Lyonsia norvegica (J.F. Gmelin, 1791) Lyonsia nuculaniformis Scarlato, 1981 Lyonsia panamensis Dall, 1908 Lyonsia praetenuis Dunker, 1882 Lyonsia shimkevitch (M. Sars, 1868) Lyonsia striata (Montagu, 1815) Lyonsia taiwanica Lan & Okutani, 2002 Lyonsia ventricosa Gould, 1861 Lyonsia vniroi Scarlato, 1981
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