prothorax

(redirected from prothoracic)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

prothorax

(prō-thôr′ăks′)
n. pl. pro·thoraxes or pro·thoraces (-thôr′ə-sēz′)
The anterior division of the thorax of an insect, bearing the first pair of legs.

pro′tho·rac′ic (-thə-răs′ĭk) adj.

prothorax

the first thoracic segment in insects.
References in periodicals archive ?
The prothoracic legs bear two articulated pretarsal claws (except the Indochinese genus Namtokocoris Sites, which has one claw).
A neuronal model has been proposed to explain how syllable period is encoded by auditory neurons in the prothoracic ganglion and how neuronal selectivity to syllable period increases with increased hormonal levels.
Legs pale brown, hindfemur dark brown except base and extreme apex paler, base of fore and midfemora brown, hindtibia with subapical dorsal dark spot, not abutting ventral side; tarsomeres 1-3 with ventral palisade setae in all legs; hindtibial comb with two rows of spines, apical row with 9-10 spines, subapical row with 14-15 spines; prothoracic TR 0.
An introduction to the study of insects) mentioned that many Coleoptera have prosternal sutures that divide the prothoracic sternum from the rest of the segment.
The prothoracic legs are raptorial and are used to grasp and hold females during mating interactions.
In insects, the physiological event demarcating the transition from flexible to determinate development is probably the activation (or release from inhibition) of neurosecretory cells in the brain to produce a peptide hormone (PTTH = prothoracicotropic hormone) that, in turn, stimulates the prothoracic glands to produce ecdysteroid, the immediate cause of metamorphosis (Nijhout 1981, Raabe 1989, Riddiford 1994).
Thorax: Dorsally brown, ventrally white; prothoracic leg creamy; meso- and metathoracic legs with femur brown dorsally and white ventrally, the other segments light brown.
Thorax: upper and lower frontal horn absent, a pair of lower facial papillae (one setose and one bare) each side of midline, three lateral papillae (one setose and two bare) each side of midline, prothoracic spiracle cylindrical, 0.
5): Ground colour wholly dark or to varying extent ochre-yellow on prothoracic parts, covered in thick light grey to olive-grey dusting, on middle third of mesonotum sometimes with a median brown vitta.
Legs yellowish brown, hairy; hind coxa brown; first tarsomere of hind leg with basal stout spine; prothoracic TR 1.