- clithrum
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n.; pl. clithra [Gr. clithros, bar](ARTHROPODA: Insecta)One of a pair of sclerotic rings of the epipharynx, that separates the corypha and the paria of certain scarabaeoid larvae.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.