Tylenchoid bursa see bursa

tylenchoid esophagus (nemata: Secernentea) An esophagus with a narrow procorpus, a strongly formed median bulb (metacorpus), followed by a narrow typical isthmus and terminating with a glandular basal bulb.

tyloid n.; pl. tyloides [Gr. tylos, knob] (ARTHRO: Insecta) In Trigonalidae and Ichneumonidae, any large indented, flattened or raised sensory area on the antennae.

tylosis n.; pl. -es [Gr. tylos, knob] A hardening or thickening; a callous.

tylostyle a. [Gr. tylos, knob; stylos, column] (PORIF) A monactinal monaxon knobbed at the broad end and pointed at the other. see subtylostyle.

tylote n. [Gr. tylos, knob] (PORIF) A diactional monaxon in which both broad ends are knobbed.

tylus n.; pl. tyli [Gr. tylos, knob] (ARTHRO: Insecta) The distal part of the clypeal region of the head.

tymbal n. [F. timbale, kettledrum] (ARTHRO: Insecta) In Hemiptera (Cicadidae), an area of thin cuticle supported by a cuticular rim and a series of dorso-ventral strengthening ribs; involved in sound production. see Pearman's organ.

tympanal air chamber (ARTHRO: Insecta) An air-sac or space, usually posterior to the tympanal organ into which outside air is admitted by a spiracle allowing the tympanum to vibrate freely.

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