Key to Suborders Lepadomorpha and Scapellomorpha

Taken primarily from  Kozloff, 1987, 1996  p. 315 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
Taxonomic levels as specified in Martin and Davis, 2001

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1a	Capitulum with more than 10 plates; attached to rocks	2
1b	Capitulum with either 5 plates or only 2 small plates; attached to floating timbers, glass floats, or jellyfishes, or secreting a firm, gelatinous float	3
2a	Capitulum with numerous small plates in addition to 5 larger plates; carina without spines arising from edges; common mid-intertidal species in areas where there is considerable wave action, and generally associated with Mytilus californianus (also subtidal in situations where there is a swift current)	Pollicipes  polymerus
2b	Capitulum with 13 or 14 plates; l carina with distinct spines arising from ridges; subtidal, rare	Scalpellum columbianum
3a	Capitulum with only 2 small, Y-shaped plates; attached to scyphozoan jellyfishes	Alepas pacifica
3b	Capitulum with 5 plates; attached to floating timbers, glass, floats, and similar objects, or secreting a firm, gelatinous float	4
4a	Capitulum flattened; attached to floating timbers and similar objects	5
4b	Capitulum nearly globular, secreting a firm, gelatinous float (as a rule, several to many individuals contribute to a common float)	Lepas fascicularis
5a	Tergum with a rather distinct notch on the side that borders the scutum	Lepas pacifica
5b	Tergum without a notch on the side that borders the scutum	6
6a	Plates with fine striations; with not more than 2 filamentous outgrowths originating at the base of each of the first cirri	Lepas anatifera
6b	Plates smooth; with 3 or more filamentous outgrowths originating at the base of each of the first cirri	Lepas hilli