Uncinal plate see radula

uncinal seta (ANN: Polychaeta) Setae modified into hooks, functioning in feeding or gripping.

uncinate a. [L. uncinus, hook] 1. Hooked or barbed at the end; unciniform. 2. (PORIF) Pertaining to megascleres, a fusiform oxea with thornlike spines.

uncinate mastax (ROTIF) A mastax with fulcrum and manubria greatly reduced, stout rami, and large subunci; specialized for food laceration.

uncini n.pl; sing. uncinus [L. uncinus, hook] 1. (ANN: Polychaeta) Deeply embedded seta with only its multidentate head showing above the cuticle. 2. (MOLL: Gastropoda) Numerous small teeth- or hook-like structures on the radula of plant-eating gastropods.

uncus n.; pl. unci [L. uncus hook] 1. (ARTHRO: Insecta) a. In some larvae, a hooked process on the distal inner margin of the maxillary mala, possibly a reminant of the lacinia. b. In Lepidoptera, a process of the 10th abdominal tergum overhanging the anus. 2. (ROTIF) One of a pair of the seven main pieces of the mastax.

underbridge n. [A.S. under, below; bricg, bridge] (NEMATA: Secernentea) In Heterodera cysts, a structure extending across the vulval cone below and parallel to the vulval bridge.

undifferentiated a. [A.S. un-, not; L. differens, dissimiler] 1. Immature or embryonic form; unspecialized; capable of differentiation into more specialized form. 2. With cells, meaning an embryonic cell that can develop into other types of cells.

undose a. [L. unda, wave] Undulating; nearly parallel depressions blending more or less into each other.

undulate a. [L. unda, wave] Having a wavy surface or margin.

ungual a. [L. unguis, claw] Pertaining to the ungues or claws.

unguiculus n.; pl. unguiculi [L. dim. unguis, claw] 1. A small terminal claw or nail-like process. 2. (ARTHRO: Insecta) The smaller of the toothed tarsal claws of Collembola. ungui-culate a. see unguis.

unguifer n. [L. unguis, claw; ferre, to bear] (ARTHRO: Insecta) A median process of the last tarsomere, articulating with the pretarsal claws.

unguiferate a. [L. unguis, claw; ferre, to bear] (PORIF) Pertaining to a type of chelate microsclere with short and discrete teeth, often more than three at each end of the shaft.

unguiflexor n. [L. unguis, claw; flectere, to bend] (ARTHRO: Insecta) Muscles responsible for moving or extending the ungues.

unguiform a. [L. unguis, claw; forma, shape] Shaped like a claw.

unguis n.; pl. ungues [L. unguis, claw] (ARTHRO) 1. The lat eral claw of the pretarsus of several groups. 2. The larger of the toothed tarsal claws of Collembola. ungual a. see uguiculus, homodactyl.

unguitractor n. [L. unguis, claw; tract, to pull] (ARTHRO: In-secta) A ventral sclerotized plate of the pretarsus from which arises the retractor muscles of the ungues or claws; also called unguitractor plate.

unguitractor tendon (ARTHRO: Insecta) The tendon serving for attachment of the unguitractor to the pretarsal depressor muscle; apodeme.

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