Presegmental region see acron

presocial a. [L. prae, before; socialis, of companionship] (ARTHRO: Insecta) Applied to groups that display some degree of social behavior short of true social behavior. see subsocial, parasocial.

presternum n. [L. prae, before; Gr. sternon, chest] (ARTHRO: Insecta) The first subdivision of the eusternum, followed by the basisternum and sternellum.

prestomal teeth (ARTHRO: Insecta) In Diptera, a row of teeth protruded by the labella, by means of blood-pressure, to allow food particles to traverse the pseudotrachae.

presutural bristles (ARTHRO: Insecta) One or more thoracic bristles of Diptera, immediately in front of the transverse suture on either side.

presynaptic a. [L. prae, before; Gr. synapsis, union] Pertaining to structures or events before a synapse.

pretarsus n. [L. prae, before; Gr. tarsos, flat of the foot] 1. (ARTHRO) The terminal segment of the leg of various arthropods, usually consisting of the lateral claws (ungues), and one or more pad-like structures; dactyl; dactylo-

pod(ite). 2. (ARTHRO: Chelicerata) In Acari, a small, terminal part of the tarsus with an endoskeleton of two scle-rotized pieces articulating with the apotele.

preungual process (ARTHRO: Crustacea) In Malacostraca, a structure at the base of the dactyl of the 4th pereopod in Paguridae; thought to be sensory in function.

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