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Pectinate

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Pectinate antennae are shaped like combs.

Pectinate antennae are shaped like combs.

Wikimedia Commons user L. Shyamal, license cc-by-SA 2.5
Definition:

Pectinate is a term used to describe certain insect antennae. The segments of pectinate antennae are longer on one side, giving each antennae a comb-like shape. Bipectinate antennae look like two-sided combs. The term pectinate derives from the Latin pectin, meaning comb.

Pectinate is a morphological form of antennae found in some groups of insects, especially in some beetles and sawflies.

Pectinate 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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