Subgenus (Cryptodon) T. A. Conrad, 1837
(3-4-4-0-21-3-1-15-1-0-0-0-0) [see also as Genus] nuttallii T. A. Conrad, 1837 (3-4-4-0-21-3-1-15-1-1-0-0-0) [=Tresus nuttallii (T. A. Conrad, 1837)] Ref. Bernard, 1983 p 40
(3-4-4-0-21-3-1-15-1-0-0-0-0) [see also as Genus]
nuttallii T. A. Conrad, 1837 (3-4-4-0-21-3-1-15-1-1-0-0-0) [=Tresus nuttallii (T. A. Conrad, 1837)] Ref. Bernard, 1983 p 40