Dorsal hair tuft see dorsal tuft

dorsalia [L. dorsum, back] (GNATHO) Paired sensory bristles found dorsally on the head.

dorsal lip 1. (G.T.) 2. (ARTHRO: Insecta) In Coccoidea, a chiti-nized plate supporting the anal tube.

dorsal margin/border 1. (G.T.) 2. (ARTHRO: Crustacea) In Ostracoda, part of the valve outline, above or at the hinge line.

dorsal ocelli (ARTHRO: Insecta) Simple eyes of adults, that vary in number from 2 to 3 in different orders.

dorsal organ 1. (ANN: Polychaeta) In Orbiniida and Spionida, ciliated sensory tubercles, ridges, or bands located on the dorsal surface of the segments. see lateral organs. 2. (ARTHRO: Crustacea) Thickened glandular area of hypoderm on the dorsal surface in the posterior or anterior part of the cephalon. 3. (ARTHRO: Insecta) A distinct mass of cells in the dorsal part of an embryo.

dorsal ostioles (ARTHRO: Insecta) In Pseudococcidae, the dorsal tranverse, slit-like openings on the pronotum and the sixth abdominal segment.

dorsal plate 1. (ARTHRO: Chelicerata) In Mesostigmata, the dorsal plate on the body. 2. (ARTHRO: Crustacea) In Deca-poda, a spindle-shaped division of the carapace. 3. (ARTHRO: Insecta) a. In Buprestidae larva, the plate or disk on the dorsal surface of the enlarged segment back of the head. b. In some Diaspididae, slightly to elaborately branched marginal pygidial processes with none to many microducts.

dorsal pores (ARTHRO: Insecta) In Coccoidea, the outlet of wax glands; the ceratubae.

dorsal scale 1. (G.T.) 2. (ARTHRO: Insecta) a. The wax and exuviae cover resting tentlike over the body of armored scale. b. Usually two peglike cibarial setae borne lateral and/or posterior to the anterior hard palate of the cly-peopalatum of mosquitoes.

dorsal setae 1. (G.T.) 2. (ARTHRO: Insecta) Usually two peglike cibarial setae borne lateral and/or posterior to the anterior hard palate of the clypeopalatum of mosquitoes.

dorsal shield (ECHINOD: Asterozoa) In Ophiurida, the ossicles along the mid-line of the aboral arm surface; dorsal arm plate.

dorsal sinus 1. (G.T.) 2. (ARTHRO: Insecta) The blood space enclosed by the dorsal diaphragm and the heart; dorsal pericardial sinus; pericardial cavity.

dorsal spine 1. (G.T.) 2. (ARTHRO: Crustacea) In Ostracoda, sometimes prominent, solid or hollow, pointed projection on the dorsal valve margin.

dorsal spur 1. (G.T.) 2. (ARTHRO: Insecta) In Syrphidae larvae, a pointed spine or ridge-like elevation of the posterior spiracular plate mesad to the circular plate.

dorsal star (ECHINOD: Crinoidea) In some Comatulida, a stellate hollow around the aboral pole of the centrodorsal ossicle.

dorsal stylet (ARTHRO: Insecta) In Anoplura, one of two stylets that are retracted within the trophic pouch.

dorsal tentorial arm (ARTHRO: Insecta) Thought to be an outgrowth of the anterior arm, which it joins near the junction of the anterior and posterior arm; frequently reduced or more or less consolidated in Diptera.

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