Hancock's organ

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A microphoto of Hancock's organ (ho) of a sea slug Pseudunela marteli.
A microphoto of head region of Pseudunela marteli shows position of Hancock's organ (ho) near eye (ey) and rhinophore (rh).

Hancock's organ is a lateral sensory organ of gastropods, a sense organ found in some sea snails.[1] This organ is found in most of the shelled opisthobranchs.[1]


  1. ^ a b Schrödl M. & Neusser T. P. (2010). "Towards a phylogeny and evolution of Acochlidia (Mollusca: Gastropoda: Opisthobranchia)". Zoological Journal of the Linnean Society 158: 124-154. doi:10.1111/j.1096-3642.2009.00544.x.