Gymnangium prolifer (Bale, 1882). A, pinnate stems from colony. B, hydrocladial internodes, lateral view, hydrotheca with short median nematothecae. C, hydrotheca with long median nematotheca. D, hydrotheca, anterior view. E, scoop-shaped bifid anterior cusp. F, cauline nematothecae with multiple apertures beside cauline apophysis. G, gonotheca. Bar scale: A, 80 mm; B, C, D, 300 µm; E, F, 100 µm; G, 1 mm.

From Watson, J.E. (2005). Hydroids of the Archipelago of the Recherche and Esperance, Western Australia: annotated list, redescriptions of species and descriptions of new species. In: Wells FE, Walker DI, Kendrick GA (eds) The Marine Flora and Fauna of Esperance, Western Australia. Western Australian Museum, Perth.

Photographer: Watson, Jeanette. Publisher: Watson, Jeanette.