empodium

From ZooTerms (Dictionary of Invertebrate Zoology)
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empodium (noun; plural empodia; Greek en, in; pous, foot): (Arthropoda: Insecta) A median bristle-, spine- or lobe-like process arising ventrally at the apex of the last tarsal segment, usually from the unguitractor plate

See also: arolium, digitules.