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The mesothorax is the middle of the three segments of the thorax of hexapods, and bears the second pair of legs. Its principal sclerites (exoskeletal plates) are the mesonotum ( dorsal ), the mesosternum ( ventral ), and the mesopleuron ( lateral ) on each side.
It is formed by the prothorax, mesothorax and metathorax and comprises the scutellum; the cervix, a membrane that separates the head from the thorax; and the pleuron, a lateral sclerite of the thorax. In dragonflies and damselflies, the mesothorax and metathorax are fused together to form the synthorax. [1] [2]
The insect thorax has three segments: the prothorax, mesothorax, and metathorax. The anterior segment, closest to the head, is the prothorax; its major features are the first pair of legs and the pronotum. The middle segment is the mesothorax; its major features are the second pair of legs and the anterior wings, if any.
Bodianus mesothorax, the split-level hogfish, blackbelt hogfish, black-belt hogfish, coral hogfish, eclipse hogfish, eclipse pigfish, mesothorax hogfish or yellow-spotted hogfish, [3] is a species of wrasse native to the western Pacific Ocean and the eastern Indian Ocean.
The mesothorax is evolved to have more powerful muscles to propel moth or butterfly through the air, with the wing of said segment having a stronger vein structure. [ 33 ] : 560 The largest superfamily, Noctuidae , has the wings modified to act as tympanal or hearing organs [ 50 ] Modifications in the wing's venation include: [ 49 ]
The metathorax is the posterior of the three segments in the thorax of an insect, and bears the third pair of legs.Its principal sclerites (exoskeletal plates) are the metanotum (), the metasternum (), and the metapleuron on each side.
In consequence of this morphological structure, the mesothorax represents the segment of greater development and complexity, while the prothorax and metathorax are considerably reduced. The halteres are club-shaped organs, used to balance the insect in flight, consisting of a proximal portion connected to a mechano-sensory organ.
Prothorax of a beetle. The prothorax is the foremost of the three segments in the thorax of an insect, and bears the first pair of legs.Its principal sclerites (exoskeletal plates) are the pronotum (), the prosternum (), and the propleuron on each side.