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n. pl.1.(Zool.) A division of chelonians which comprises Trionyx and allied genera; - called also Trionychoides, and Trionychina.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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There are three superfamilies of eucryptodires; the Trionychoidea, Chelonioidea and Testudinoidea (Gaffney, 1975).