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The legs arise from the mesopleuron and metapleura. The mesothorax and metathorax each have a pleural suture (mesopleural and metapleural sutures) that runs from the wing base to the coxa of the leg. The sclerite anterior to the pleural suture is called the episternum (serially, the mesepisternum and metepisternum).
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.
The prothorax (T1) has a functional spiracle which is actually derived from the mesothorax (T2) while the metathorax has a reduced spiracle which is not externally open and lies beneath the cuticle. [ 59 ] : 114 The thoracic legs consist of coxa, trochanter, femur, tarsus, and claw and are constant in form throughout the order.
Metapleural glands (also called metasternal or metathoracic glands) are secretory glands that were considered unique to ants and basal in the evolutionary history of ants. They are responsible for the production of an antibiotic fluid that then collects in a reservoir on the posterior of the ant's alitrunk .
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The suture separates two regions: 1. the upper one is the frontal region, which has continuity with the apex, the orbital region and the gena, 2. the lower one, the face or clypeus, contains the insertion of the antennae and ends with the epistomal edge which comprises the upper lip.
Many surgical procedure names can be broken into parts to indicate the meaning. For example, in gastrectomy, "ectomy" is a suffix meaning the removal of a part of the body. "Gastro-" means stomach. Thus, gastrectomy refers to the surgical removal of the stomach (or sections thereof).
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