Assertion: sea slug's body | /r/HasProperty | extended
Facets:
Source sentences:
text: Mantle covering all of the back (dorsum) of the animal, or nearly so, or saddle-like mantle structure not apparent in anterior region when body is extended
text: Mantle consisting of an elevated saddle-like structure that is apparent when the body is extended, and located only in the anterior region of the body (Figures 19–23); breathing pore (pneumostome) present (although it may be closed) posteriorly (away from the head) on right margin of mantle (Figure 7) . . . . . .