Pleurotomaria depressa

Pleurotomaria illinoisensis

Pleurotomaria sphaerulata

Trepospira baconi

Trepospira bella

Trepospira convexa

Trepospira desultoria

Trepospira diadema

Trepospira discoidalis

Trepospira haworthi

Trepospira inflata

Trepospira minima

Trepospira regularis