November 13, 2008
From: David Mullins
To accompany message #22025, here are some more pics of the Hancockia showing the anterior ventral features, detail of the cerata and the midline dorsal papillae.
Locality: Woody Point, Redcliffe Peninsula, Moreton Bay, intertidal, Queensland, Australia., Pacific Ocean, 09 August 2008, weed covered intertidal rocks. Length: 7 mm. Photographer: David Mullins.
Mullins, D.A., 2008 (Nov 13) Hancockia burni ? at Woody Point Queensland . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22027
Thanks very much for these photos. The branched papillae [gills] down the dorsal midline are certainly very conspicuous but I assume they can retract to a small 'bump' on the skin. The rounded nodules on the 'fingers' of the cerata are quite interesting, because they contain nematocysts - the stinging cells from their food. These are interesting, because we normally think that aeolid nudibranchs are the only nudibranchs that store nematocysts [see cnidosac Fact Sheet]. In Hancockia, these nematocyst-storing nodules occur not only on the 'cerata' but also on the back, sides of body, and even on the rhinophore sheaths.