From ZooTerms (Dictionary of Invertebrate Zoology)
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elattostase (noun; Greek elatton, smaller; stasis, position): (Arthropoda: Chelicerata) A rare stase of prelarva or larva in which the mouthparts are subject to regression in that though the mouthparts are intact, they are unable to function, or the lack of chelicerae and palps, closure of the mouth, and regression of the pharynx.