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. 1999 Mar 2;96(5):2183–2186. doi: 10.1073/pnas.96.5.2183

Figure 1.

Figure 1

Polymorphic polyps of Hydractinia, with three of the polyp types shown in a colony and the fourth polyp type shown detached. (a) gastrozooid; (b) gonozooid; (c) dactylozooid; and (d) tentaculozooid. Modified from refs. 13 and 21.