prothorax


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Related to prothorax: pronotal, Pronotum, Propleuron

prothorax

[prō′thȯr‚aks]
(invertebrate zoology)
The first thoracic segment of an insect; bears the first pair of legs.
References in periodicals archive ?
Antennae extending to the apical side of the prothorax, first tarsal segment shorter than length of 2nd and 3rd together .
The new species is very closely related to Tettigonia viridissima (Linnaeus, 1758) in the U" shaped marking at posterior sulcus on the pronotum and having two thin spines on the ventral surface of prothorax.
The wing buds and prothorax reflected less intensely and the wing buds appeared to have slightly higher reflectance in the UV than other body parts (see Fig.
Pupa with vertex of head round and with prominent medial dorsoventral depression; prothorax smooth dorsally, not square, with two anterolateral horn-like structures that protrude only slightly; anus posteriorly with lateral conical depressions.
35 mm prothorax width) than similar males from lines selected for relatively short horns (3.
Big and large; all body covered with yellow or ash colored on the testaceous or reddish ground, with black prothorax and head.
Pygidium covered by the elytra, not vertical, intermediate uroesternites not narrowed in the middle, head not or only slightly concealed within prothorax when viewed dorsally 2 1'.
No macropterous form is known for any of the two species of Paraphrynovelia, and Damgaard (2008b) could not find any convincing morphological characters to diagnose Paraphrynoveliidae, whereas Macroveliidae was diagnosed by the presence of paired, longitudinal ridges of the basal abdominal tergites and two characters also found in Hydrometridae: Eyes distinctly removed from the anterior margin of prothorax and the dorsally placed metathoracic spiracle.
The most useful morphological characters are 1) the details of the rugosities and tuberculation of the head and prothorax of the females 2) the details of the prosternal process.
The dorsal scolus of the prothorax, mesothorax, and the ninth abdominal segment are longer than the others, a larval feature very common among Hemileucinae (Lemaire, 2002); the scoli are slightly clearer than the integument, but their urticating setae are darker.