Bivalvia - Pectinida - Deltopectinidae

Synonyms: Aviculopecten alatus Branson 1930, Aviculopecten alternatus Branson 1930

Belongs to Cyrtorostra according to S. A. Quiroz-Barroso et al. 2012

Sister taxa: Cyrtorostra atavum, Cyrtorostra cardiiformis, Cyrtorostra caucasica, Cyrtorostra fraterna, Cyrtorostra jisuensis, Cyrtorostra laticostata, Cyrtorostra limitans, Cyrtorostra lunwalensis, Cyrtorostra nana, Cyrtorostra obeliscus, Cyrtorostra omanensis, Cyrtorostra primorica, Cyrtorostra subexotica, Cyrtorostra trifurcata

Type specimens:

• Cyrtorostra varicostata: Its type locality is Bull Lake (Ervay Mb), Cedar Ridge, Fremont County, which is in a Capitanian carbonate limestone in the Park City Formation of Wyoming
• Aviculopecten alatus:
• Aviculopecten alternatus:

Ecology: stationary epifaunal suspension feeder

Average measurements (in mm): shell 9.62 x 4.67, valve length 5.22