Key:  Order Gymnosomata

Taken primarily from  Kozloff, 1987, 1996 p. 241 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a	With stellate  chromatophores on the body; lateral  gill a membranous, unpigmented band near the middle of the body, posterior  gill with 4 radial crests; with 2 lateral buccal appendages, each with numerous stalked suckers; proboscis large and protrusible	Pneumodermopsis macrochira
1b	Without chromatophores; without gills; with 3 pairs of buccal appendages (buccal cones), these without stalked suckers; without a proboscis	Clione limacina

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Salish Sea Invertebrates web site provided courtesy of Walla Walla University