A. Adams, 1851 : 88 Cryptomy decurtata ( A. Adams, 1851 ) A. Adams, 1868 : 366 Beets, 1949 : 273 Beets, 1950 : 17 Mya decurtata ( A. Adams, 1851 ) Distugonia decurvata ( A. Adams, 1851 ) Habe, 1951 : 75 Habe, 1961 : 140 Habe, 1968 : 205 Habe, 1977 : 279 Wu, 1980 : 189 Xu, 1997 : 230 Okutani, 2000 : 1021 Distugonia decurtata ( A. Adams, 1851 ) Bernard et al. 1993 : 107 Tugonella decurtata ( A. Adams, 1851 ) Huber, 2010 : 461 The Myidae (Mollusca, Bivalvia) from Chinese waters with description of a new species Zhang, Jun-Long Xu, Feng-Shan Liu, Rui-Yu Zootaxa 2012 3383 39 60 A. Adams, 1851 A. Adams 1851 [151,730,151,176] Bivalvia Myidae Tugonia Animalia Myoida 14 53 Mollusca species decurtata Distugonia     Sphenia decurtata  A. Adams, 1851: 88–89.    Cryptomy decurtata( A. Adams, 1851)—  A. Adams, 1868: 366;  Beets, 1949: 273, 277;  Beets, 1950: 17.   Mya decurtata( A. Adams, 1851)— Sowerby, 1875: sp. 11, pl. III, fig. 11.    Distugonia decurvata( A. Adams, 1851)—  Habe, 1951: 75, pl. 12, figs. 15 & 16;  Habe, 1961: 140, pl. 63, fig. 11;  Habe, 1968: 205, pl. 63, fig. 11;  Habe, 1977: 279, pl. 58, figs. 7 & 8;  Wu, 1980: 189;  Xu, 1997: 230; Xu, 2008: 590;  Okutani, 2000: 1021, pl. 508, fig. 4 [spelling error].    Distugonia decurtata( A. Adams, 1851)—  Bernard et al.1993: 107.    Tugonella decurtata( A. Adams, 1851)—  Huber, 2010: 461(text-fig.).   Distribution and habitat.Miocene to Recent. Taiwan, China; Japan; Philippines. Intertidal mud bottom to  50 m.    Typelocality.Catanuan, Province of Tayabas, Island of Luzon, in sand at low water depths.   Diagnosis.Length to 30 mm; shell slightly inflated, elongate-oval; umbo prominent, situated subcentral; posterior area demarcated by ridge; chondrophore projecting in the left valve, right valve resilifer compressed; pallial sinus shallow, not reaching further anterior than posterior adductor scar; pallial line thin.   Remarks.This species had been incorrectly spelled as  decurvataby some Japanese and Chinese authors.