Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
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abactinal — adj. [L. ab, from; Gr. aktis, ray] (ECHINODERMATA) Of or pertaining to the area of the body without tube feet that normally does not include the madreporite; not situated on the ambulacral area; abambulacral; abactinally adv … Dictionary of invertebrate zoology