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The hypobranchial gland is a glandular structure which is part of the anatomy of many mollusks, including several different families of gastropods, and also many protobranch bivalves.〔Fretter & Graham, 1962, p. 88〕 This gland produces mucus as well as biologically active compounds. The cephalopod ink sac is a modified hypobranchial gland.〔Nair, J.R., D. Pillai, S.M. Joseph, P. Gomathi, P.V. Senan & P.M. Sherief (2011). ''Indian Journal of Geo-Marine Sciences'' 40(1): 13–27.〕 ==Anatomy and function== ;Gastropods The hypobranchial gland is found in many sea snails, including those in the families Haliotidae, Buccinidae, Mitridae and Costellariidae. It usually presents itself as a thickening of the tissue located in the roof of the animal's mantle cavity.〔Pontarotti, 2010, p.260〕 Its morphology, however, is variable between different groups of snails. ;Aculifera In the aculifera the hypobranchial glands are referred to as "mucus tracts" and occupy a posterior position in the body. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hypobranchial gland」の詳細全文を読む スポンサード リンク
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