labial palp

From ZooTerms (Dictionary of Invertebrate Zoology)
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labial palp also labial palpus, plural labial palpi: 1. (Arthropoda: Insecta) One of a pair of small feelerlike structures borne on the labium. See also maxillary palp.

2. (Mollusca: Bivalvia) One of 4 structures (2 on each side of the mouth) derived from the velum by which the larva swims and collects food