unguis: one of the claws at the end of the tarsus: also applied to a short process on the 6th antennal joint in some Aphids.
unguis un·guis (ŭng'gwĭs)
n. pl. un·gues (-gwēz)
Any of the thin horny translucent plates covering the upper surface at the end of each finger and toe, consisting of a visible body and a root concealed under a fold of skin; a fingernail or toenail. Also called onyx.