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Capitate

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Capitate antennae end in a prominent club or knob.

Capitate antennae end in a prominent club or knob.

Modified from A Manual for the Study of Insects, John Henry Comstock, 1895 (Public Domain)
Definition:

Capitate is a term used to describe certain insect antennae. Capitate antennae have a prominent club or knob at their ends. The term capitate derives from the Latin caput, meaning head.

Capitate is a morphological form of antennae found in some insect groups, most notably in butterflies (Lepidoptera).

Capitate is just one of many morphological forms of insect antennae. See also:

Source: Borror and DeLong's Introduction to the Study of Insects, 7th Edition, by Charles A. Triplehorn and Norman F. Johnson

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