Turbinate: top-shaped; nearly conical: differs from pyriform in being shorter and more suddenly attenuated at base: applied to an eye = pillared eye; q.v.
Turritus: towering: a surface rising cone-like.
Tylus: the anterior central lobe of the head in Hemiptera.
Tympanal: applied to organs covered with a tympanum or stretched membrane supposed to function as ears.
Tympanic spiracle: in Diptera, the thoracic spiracle at base of wing.
Tympanules: small openings covered by a membrane, having otoliths and serving as ears.
Tympanum: any membrane stretched like the head of a drum: specifically applied to the membrane covering the auditory organs in Orthoptera.
Type: a unique or single specimen selected from a series and labelled by the describer to represent his name and description: if male or female be added to the label, the specimen typifies that sex, and in case of an erroneous association the male type stands for the species unless the author has specifically designated the other example as representing the name: see also co-type; homotype; meta-type; paratype; topotype.
Typical: the normal or usual form of a species; agreeing with the type form.
Ulnar: in Homoptera, a wing vein between the radial vein and claval suture; = cubitus: in Orthoptera, = cubitus; q.v.
Ulnar area: in Orthoptera, = median area; q.v.
Ulona: the thick, fleshy mouth parts of Orthoptera.
Ulonata: a Fabrician. term for Orthoptera, based on the character of the mouth structures.
Ultimate: last or final: that larval stage just before pupation.
Ultramarine: an intense deep blue [cobalt blue].
Ultra-nodal sector: in Odonata, runs parallel with and between media 1 and 2, or principal and nodal sectors: = postnodal sector.
Umbilicate: navel-shaped, or resembling a navel.
Umbilicus: a navel, or navel-like depression.
Umbonate: bossed; with an elevated knob in the centre.
Umbone: an embossed, elevated knob situated on humeral angle of elytra.
Umbones: two movable spines on the sides of prothorax in some Coleoptera.
Umbrosa: shaded or clouded: a cloud or shade.
Unarmed: without spurs, spines or armature of any kind.
Unci: thick, hooked processes, forming the borders of the anal opening.
Uncus: in Lepidoptera, Diptera, and elsewhere, the curved book directed downward from a triangular dorsal plate in the male and shielding the penis: the genital hamule.