Bivalvia - Venerida - Mactridae
Alternative spelling: Hemimactra
Parent taxon: Spisula according to J. H. Signorelli 2019
See also Clark and Arnold 1923, Gardner 1947, Glenn 1904, Hendy et al. 2008, Olsson 1914, Packard 1916 and Sepkoski 2002
Sister taxa: Mactra (Spisula) sammamishensis, Spisula (Austromactra), Spisula (Crassula), Spisula (Cymbophora), Spisula (Eomactra), Spisula (Notospisula), Spisula (Notospisula), Spisula (Ruellia), Spisula (Spisula), Spisula (Stereomactra), Spisula arcuata, Spisula brombachensis, Spisula callistaeformis, Spisula compressa, Spisula craspedota, Spisula decisa, Spisula dernburgi, Spisula elliptica, Spisula hannibali, Spisula hemphillii, Spisula jacksonensis, Spisula obtruncata, Spisula paralis, Spisula parilis, Spisula praetanius, Spisula praetenuis, Spisula rappahannockensis, Spisula semisulcata, Spisula sookensis, Spisula sorachiensis, Spisula subcuneata, Spisula subtruncata, Spisula twinensis, Spisula veneriformis, Notospisula trigonella
Subtaxa: Spisula (Hemimactra) confraga Spisula (Hemimactra) harrisi Spisula (Hemimactra) raveneli Spisula (Hemimactra) selbyensis Spisula (Hemimactra) solidissima Spisula (Hemimactra) sookensis Spisula (Hemimactra) subparilis
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Quaternary of United States (50: Delaware, Florida, Louisiana, Maine, Maryland, Massachusetts, New Jersey, New York, North Carolina, South Carolina, Virginia collections)
• Pliocene of United States (11: Florida, North Carolina, South Carolina, Virginia)
• Miocene of United States (29: Florida, Georgia, Maryland)
• Oligocene of Canada (3: British Columbia)
Total: 93 collections including 97 occurrences