- hemiseptum
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n.; pl. hemisepta [Gr. hemisys, half; L. septum, wall](BRYOZOA: Stenolaemata)Shelf-like projections into zooid living chambers; usually on proximal walls, but also in pairs on proximal and distal walls which differ in morphology; see hemiphragms.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.