Marcia (Marcia) Adams and Adams 1857 (venus clam)
Bivalvia - Venerida - Veneridae
Parent taxon: Marcia according to H. Adams and A. Adams 1857
Sister taxa: Marcia (Gomphomarcia), Marcia (Hemitapes), Marcia (Similivenus)
Subtaxa: Marcia (Marcia) opima
Type: Venus opima
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Miocene of Fiji (1 collection)
• Oligocene of United States (1: Washington)
Total: 2 collections each including a single occurrence