labial mask (ARTHRO: Insecta) A modification of the labium of dragonfly larvae in which the pre- and post-mentum are elongated and the palps modified into grasping organs for catching prey.
labial nephridia (ARTHRO: Insecta) Tubules in the head of Collembola and Thysanura, whose terminal sac may play some excretory role.
labial palp/palpus pl. -pi 1. (ARTHRO: Insecta) One of a pair of small feelerlike structures borne on the labium. see maxillary palp. 2. (MOLL: Bivalvia) One of 4 structures (2 on each side of the mouth) derived from the velum by which the larva swims and collects food.
labial plate (ARTHRO: Insecta) A sclerotized, serrated plate derived from the labium of larvae of aquatic Diptera; mental plate.
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