Taken primarily from Kozloff, 1987, 1996 p. 85 (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 | Ventral surface with a sucker (this is independent of the digestive system, and lies behind the female gonopore); tentacles, when present, situated along the margin of the body at the anterior end (Suborder Cotylea) | 17 |
| 1b | Ventral surface without a sucker; tentacles, when present, of the nuchal type, situated above the brain and some distance behind the anterior end (suborder Acotylea) | 2 |
| 2a | A band of eyespots present along the entire margin of the body (these may not be visible except in transmitted light) (eyespots also present on the tentacles, at the bases of the tentacles, and in the region of the brain); length up to about 10 cm | Kaburakia excelsa |
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