†Mactromeris catilliformis alcatrazensis Arnold 1907 (narrow dish surfclam)
Bivalvia - Cardiida - Mactridae
Alternative combination: Spissula catilliformis alcatrazensis
Belongs to Mactromeris catilliformis according to E. J. Moore 2003
See also Hendy 2020
Sister taxon: Mactromeris catilliformis lenticularis
Type specimen: USNM 165291, a shell
Ecology: facultatively mobile infaunal suspension feeder
Distribution: there are no occurrences of Mactromeris catilliformis alcatrazensis in the database