Occipital tentacle see cirrus

occiput n. [L. occiput, back of the head] (ARTHRO: Insecta) 1. The dorsal posterior part of the cranium, between the occipital and postoccipital sutures; in many the boundaries with the vertex and postgenae are not delimited. 2. In Formicidae, the short region between the vertex and the neck. occipital a.

occludent margin (ARTHRO: Crustacea) In Cirripedia, the margin of the scutum and tergum bordering the orifice.

occludent teeth (ARTHRO: Crustacea) In Cirripedia, small projections on the occludent scutal margin interdigitating with the teeth on the margin of the opposed scutum.

occlusion plate (ARTHRO: Insecta) In Heteroptera larvae, a semicircularly shaped plate located below the lateral pore in the ostiole; functioning in scent ejection in any horizontal direction.

occlusor a. [L. occludare, to close] An organ or muscle that closes an opening.

occult a. [L. occulere, to hide] Hidden from sight.

oceanic zone The open sea beyond the edge of the continental shelf.

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