From ZooTerms (Dictionary of Invertebrate Zoology)
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anterior (adjective; Latin ante, before): 1. Before or toward the front.

2. Pertaining to the direction in which the head tends to point when an animal is active.

3. (Mollusca: Gastropoda) In a crawling gastropod, pertaining to the head being closest to that part of the apertural margin lying farthest from the shell apex; in high-spired conispiral shells, and some others, anterior is equivalent to abapical.