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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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 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 |