oral styles (KINOR) Spines arranged in a series around the mouth cone.
oral surface (ECHINOD: Asteroidea) The entire undersurface of the disc and arms.
oral tentacles (moll) Tentacle-like outgrowths of the lip.
oral valve (ECHINOD: Crinoidea) One of 5 low triangular flaps separating the ambulacral grooves.
oral vibrissae (ARTHRO: Insecta) In certain Diptera, a pair of stout bristles or hairs on each side of the face, near or above the oral margin; larger than those on the vibrissal ridge.
orb n. [L. orbis, circle] A circle or globe. orbicular a.
orbit n. [L. orbis, circle] 1. (ARTHRO) The part of the head surrounding an eye; orbital fossa. 2. (ARTHRO: Crustacea) In Decapoda, an opening in the anterior face of the carapace supporting the ocular peduncle.
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