Fallon P.J. (2011). Descriptions and illustrations of some new and poorly known turrids (Turridae) of the tropical northwestern Atlantic. Part 2. Genus
Crassispira Swainson, 1840, subgenera
Monilispira Bartsch & Rehder, 1939 and
Dallspira Bartsch, 1950.
The Nautilus. 125(1): 15-28.