Prehensile spines see grasping spines

preimago n. [L. prae, before; imago, image] (ARTHRO: Insecta) The last phase of pupal stage when the adult structures are seen within the pupal covering. preimaginal a.

preischium n. [L. prae, before; Gr. ischion, hip] (ARTHRO: Crustacea) When present, the segment of the endopod between the protopod and the ischium.

prelarva n. [L. prae, before; larva, mask] (ARTHRO: Chelicer-ata) In Acari with a four stage development, the first postembryonic stage usually occurring in the egg, but may be a non-feeding form after eclosion; prelarval phase.

prelateral lobe (ARTHRO: Crustacea) In Stomatopoda, the proximal lateromarginal lobe of the telson.

Pre-Linnaean name A name published prior to January 1, 1758, the starting date of zoological nomenclature.

premandibular suture 1. (ARTHRO: Chilopoda) A suture that rises posterior to the eyes, and extends transversely across the head. 2. (ARTHRO: Insecta) Known as the epicranial suture.

premental gutter (ARTHRO: Insecta) In Diptera, the median dorsal longitudinal groove of the prementum (theca) that houses the fascicle (stylets); labial gutter; labial lumen.

premental setae (ARTHRO: Insecta) In odonatan nymphs, setae on the prementum which are of taxonomic importance.

prementum n. [L. prae, before; mentum, chin] (ARTHRO: Insecta) The distal part of a labium in which all the labial muscles have their insertion.

premorse a. [L. prae, before; modere, to gnaw] Terminating abruptly, as if bitten or broken off; having blunt or jagged termination.

prenymph n. [L. prae, before; nympha, bride] (ARTHRO: Cheli-cerata) In Acari, a nonfeeding, quiescent stage in the life cycle of Trombiculidae.

preocellar band (ARTHRO: Insecta) In Odonata, a darkly pigmented stripe in front of the ocelli.

preoral cavity 1. The mouth cavity. 2. (ARTHRO: Chelicerata) In Acari, the space between the lips anterior to the oral commissures.

preoral sting (ARTHRO: Crustacea) In Branchiura, a retractile piercing structure with a basal poison gland, between the maxillulae (suction discs).

prepatent period The biological incubation period.

prepectal carina (ARTHRO: Insecta) In certain Hymenoptera, an area near the front of the mesothorax, traversing the mesosternum near the front, and continuing upward on each side of the front part of the mesopleurum.

prepectus n. [L. prae, before; pectus, chest] (ARTHRO: Insecta) The differentiated anterior portion of the mesepis-ternum, often forming a conspicuous plate on the lateral thorax between the pronotum and mesepisternum.

prephragma n. [L. prae, before; Gr. phragma, fence] (AR-THRO: Insecta) In Diptera, a phragma at the anterior margin of the mesonotum, often small or vestigial. see phragma, postphragma.

prepuce n. [L. prae, before; Gr. posthe, penis] 1. (ARTHRO: Insecta) see preputium. 2. (MOLL: Gastropoda) In certain Pulmonata, an extension of the distal end of the penis sheath.

prepupa n.; pl. -ae [L. prae, before; pupa, puppet] (ARTHRO: Insecta) Quiescent last larval instar before ecdysis to a pupa; not ordinarily representing a distinct morphological stage; propupa. see pharate. a. In Thysanoptera and male Coccidae, a morphological stage, a quiescent instar following the last larval instar, followed by a second quiescent, pupal instar. b. In Diptera, the third instar larva between pupariation and the larval-pupal apolysis. prepual a.

preputial a. [L. prae, before; Gr. posthe, penis] Of or pertaining to the prepuce.

preputial sac (ARTHRO: Insecta) An eversible sac(s) on the penis bearing a small toothed plate that grips the wall of the female vagina during copulation; vesica; genital sac.

preputium n. [L. prae, before; Gr. posthe, penis] The external covering of the penis.

prepygidium n. [L. prae, before; Gr. pyge, rump] (ANN: Poly-chaeta) An area of segment addition anterior to the py-gidium.

prerectum n. [L. prae, before; rectus, straight] An identifiable section of the alimentary canal between the mesenteron proper and the rectum. prerectal a.

prereduction n. [L. prae, before; reducere, lead back] The reduction to haploid of the chromosome number in the 1st meiotic division.

presaepium n. [L. prae, before; sepes, fence] (ARTHRO: Insecta) In larvae of the ant tribe Camponotini, the shallow depression on the venter of some anterior abdominal somites; suggested to resemble the trophothylax of pseu-domyrmecinae larva.

prescutal ridge (ARTHRO: Insecta) The internal strengthening ridge formed by the prescutal sulcus.

prescutal sulcus (ARTHRO: Insecta) A transverse sulcus dividing the notum into an anterior prescutum and a scutum.

prescutellar area (ARTHRO: Insecta) In Diptera, the median posterior area of the scutum, situated between the acros-tichal area and the scutellum; prescutellar space.

prescutellar seta/bristles (ARTHRO: Insecta) In Diptera, seta occurring in several rows on the anterior and/or lateral margins of the prescutellar area.

prescutellum n. [L. prae, before; scutum, shield] (ARTHRO: Insecta) The sclerite nearest the head when, on the rare occasion, the upper part of the segment of the notum is divided into 4 parts.

prescutum n. [L. prae, before; scutum, shield] (ARTHRO: Insecta) The first subdivision of the notum, usually followed by scutum and scutellum; the anterior division of the meso- or metanotum.

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