[Sacoglossans are mostly small, greenish herbivores, though some species feed on opisthobranch eggs. Some have shells, while others have no shells but have ridges, folds, or papilli on the back. Most have rolled, tube-like rhinophores]
Taken primarily from Kozloff, 1987, 1996 p. 242 (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 | Cerata present (there may also be a pair of rhinophores); without parapodia (broad lateral outgrowths of the foot) | 2 |
| 1b | Cerata absent; with well developed parapodia that may be turned up to cover the dorsum or spread flat against the substratum | Elysia hedgpethi |
| 2a | Cerata (about 10) limited to the posterior half of the body; body mostly black (head and tail pale gray) | Olea hansineensis |
| 2b | Cerata (usually more than 10) on both the anterior and posterior halves of the body; body not black (except in Aplysioipsis smithi) | 3 |
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