From ZooTerms (Dictionary of Invertebrate Zoology)
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dorsal (adjective; Latin dorsum, back): 1. Pertaining to the upper surface or back of the body.

2. (Arthropoda: Crustacea) In Ostracods in normal position, the upper part comprising the area that contains hinge, eyes, antennules, antennae and stomach.

3. (Brachiopoda) From the pedicle valve toward the brachial valve.

4. (Echinodermata) see aboral.

5. (Mollusca) a. In Bivalvia, the back edge in the region of the hinge. b. In Gastropoda, the back remote from the aperture; the conical top surface of a limpet.

6. (Pogonophora) see adneural.