Subgenus (Protothaca) W. H. Dall, 1902

(3-4-4-0-26-7-14-54-6-0-0-0-0)
[see also as Genus]

staminea T. A. Conrad, 1837
(3-4-4-0-26-7-14-54-6-1-0-0-0)

sulculosa W. H. Dall, 1902
(3-4-4-0-26-7-14-54-6-2-0-0-0)
[=Protothaca (Protothaca) staminea (T. A. Conrad, 1837)]
Ref. Bernard, 1983 p 52