Taken primarily from Kozloff,
1987, 1996 p. 181 (Copyright 1987, 1996, University of
Washington Press. Used in this web page by permission of University
of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Tentacles inconspicuous, fingerlike, not branched (picture) | 2 |
| 1b | Tentacles conspicuous when extended, branching dichotomously and thus appearing bushy | 4 |
| 2a | Introvert with dark blotches and transverse streaks, and with rows of small hooks near its anterior end; tentacles arranged in a crescentic series dorsal to the mouth (body posterior to introvert sometimes with dark spots; common intertidal and shallow subtidal species, generally in gravel under rocks, in crevices, or nestling in burrows made in rock by pholadid bivalves | Phascolosoma agassizii |
| 2b | Introvert without dark spots or streaks, and without rows of small hooks near its anterior end; tentacles arranged in 1 or 2 circles around the mouth (picture) | 3 |
| 3a | Introvert constituting half, or slightly more than half, of the length of the body; skin nearly smooth (papillae present, but inconspicuous); whitish to dark gray, with 2 retractor muscles | Golfingia pugettensis |
| 3b | Introvert constituting less than lahf the length of the body; skin decidedly rough; dark brown; with 4 retractor muscles | Golfingia vulgaris |
| 4a | Introvert with small, black or brown spines; with 4 tentacles (these may, however, begin to branch so close to the base that there may appear to be more than 4) (common throughout the region, mostly in tight crevices or nestling in burrows made in rock by pholadid bivalves) | Themiste pyroides |
| 4b | Introvert without spines; with 6 tentacles (not likely to be found north of Oregon) | Themiste dyscrita |
