From ZooTerms (Dictionary of Invertebrate Zoology)
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stase (noun; Greek stasis, standing): (Arthropoda: Chelicerata) 1. One of the successive instars of the postembryonic development of a specific species. 2. In Acari, an instar independent of growing molts, that is distinct within a species and can be homologized with the corresponding instars of other species.