comet stage (echinod: Asteroidea) A regenerating asteroid with a group of little arms at one end of a big arm.
comitalia n.pl. [L. comitare, to accompany] (PORIF) The small di- or tri-actine spicules. see principalia.
commensal n. [L. cum, with; mensa, table] One of the partner species involved in commensalism; a coenosite.
commensalism n. [L. cum, with; mensa, table] A symbiotic relationship in which one of the two partner species benefits, without apparent effects on the other species. see symbiosis, parasitism.
comminute v.t. [L. cum, with; minuere, to lessen] To reduce to minute particles or powder; pulverize; triturate.
commiscuum n. [L. cum, with; miscere, to mix] A group of individuals all of which can potentially exchange genes.
commissural induration (ARTHRO: Chelicerata) In mites, sclerotized thickening along the inner part of a commissural line to support the lip walls.
commissural line (ARTHRO: Chelicerata) 1. In arachnids, union between two lips. 2. In Acari there are three or four, two superiors and one or two inferiors.
commissural plane (MOLL: Bivalvia) The plane of the valve commissure.
commissural shelf (MOLL: Bivalvia) The shelflike part of the shell abutting the commissure peripherally.
commissural vessels/lateral commissures (ANN) Paired segmental lateral blood vessels from the dorsal vessel to anteriorly join the ventral vessel and more posteriorly, the sub-neural vessel; when contractile, they are called lateral hearts or pseudohearts.
commissure n. [L. commissura, joint] 1. Connection between two bodies, structures, organs or nerve fibers; a junction, seam or closure. 2. (ARTHRO: Chelicerata) In Acari, the oral commissures. 3. (MOLL: Bivalvia) The line of joining of the valves of the shell. commissural a.
common a. [L. communis, general] Of frequent or ordinary occurrence; occurring on two adjacent parts or appendages.
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