Bivalvia - Nuculida - Nuculidae
Alternative spelling: Truncacila
Parent taxon: Acila according to A. J. W. Hendy 2020
See also Coan et al. 2000, Coan and Valentich-Scott 2012, Durham 1944, Faustman 1964, Hertlein and Grant 1972, Huber 2010, Kafanov and Ogasawara 2003, Matsubara 2002, Moore 1976, Moore 1983, Schenck 1936, Sepkoski 2002, Squires 1984, Squires 1987, Squires 1988, Squires 1999, Squires and Saul 2006, Tashiro and Kozai 1982, Turner 1938, Vokes 1980 and Woodring 1938
Sister taxa: Acila (Acila), Acila nehalemensis, Acila paita, Acila plura, Nucula (Acila) ermanni, Nucula (Acila) hamiltonensis, Nucula (Acila) mirabilis, Nucula (Acila) nelsoni, Nucula (Acila) packardi, Nucula (Acila) pugetensis, Nucula (Acila) yakatagensis
Subtaxa: Acila (Truncacila) allisoni Acila (Truncacila) bellula Acila (Truncacila) bivirgata Acila (Truncacila) blancoensis Acila (Truncacila) castrensis Acila (Truncacila) cobboldae Acila (Truncacila) conradi Acila (Truncacila) dalli Acila (Truncacila) decisa Acila (Truncacila) demessa Acila (Truncacila) galinae Acila (Truncacila) grahami Acila (Truncacila) haidana Acila (Truncacila) hokkaidoensis Acila (Truncacila) jucunda Acila (Truncacila) moneronica Acila (Truncacila) muta Acila (Truncacila) nagaoi Acila (Truncacila) osugii Acila (Truncacila) princeps Acila (Truncacila) rosaria Acila (Truncacila) schencki Acila (Truncacila) shumardi
Ecology: facultatively mobile infaunal deposit feeder-suspension feeder
Distribution:
• Quaternary of Belgium (1 collection), the United Kingdom (7), United States (38: California)
• Pliocene to Pleistocene of United States (2: California)
• Pliocene of Japan (10), Mexico (1), the Russian Federation (3), the United Kingdom (4), United States (8: California, Oregon)
• Miocene to Pliocene of United States (1: California)
• Miocene of Canada (2: British Columbia), Indonesia (1), Japan (2), the Russian Federation (17), United States (34: Alaska, California, Oregon, Washington)
• Oligocene of Colombia (1), Japan (1), the Russian Federation (6), Trinidad and Tobago (1), United States (49: Alaska, California, Oregon, Washington)
• Eocene of Canada (1: British Columbia), Japan (6), the Russian Federation (4), United States (56: California, Oregon, Washigton, Washington)
• Paleocene of Japan (1), the Russian Federation (2), United States (7: California)
• Cretaceous of Japan (31), Mexico (1), the Russian Federation (3), United States (53: Arizona, California, Colorado, Texas)
Total: 354 collections including 380 occurrences