†Mactra subtruncata triangula Brocchi 1814 (clam)
Bivalvia - Venerida - Mactridae
Alternative combination: Mactra triangula
Belongs to Mactra subtruncata according to G. Henriques da Silva 1956
Sister taxa: none
Ecology: facultatively mobile infaunal suspension feeder
Distribution: found only at Plantation Santa Joana (Miocene of Sao Tome and Principe)