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The under-surfaces of the labrum and clypeus constitute the epipharynx.
Their monophyly is undisputed, given the five elongate, stiff mouthpart elements forming a distinctive beak, and an enlarged clypeus .
Although the clypeus and labrum of Reboursia exhibit a sphaeromatoid shape, it has a broad separation between the antennular basal articles.
Antennae are placed midway between clypeus midpoint and lateral margin of head, projecting laterally along anterior margin of head.
Reports that Achrysocharis species do not have a delimited clypeus are generally erroneous: the clypeus may or may not appear delimited based on the size and condition of the specimen.
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