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The thorax is divided into four segments, the prothorax, mesothorax, metathorax, and epinotum. The epinotum (which is the metanotum of some earlier writers and the propodeum of others) was the first abdominal segment of the larva, which has been fused to the thorax during pupation.

In the primitive form, all the component parts of the thorax of the male ant are distinctly separated by sutures.

The prothorax is small and is divided into the pronotum and prosternum ; the former comprises both dorsally and laterally the greater part of the prothorax, while the latter is small and narrow, and to it the coxa of the fore leg is articulated.

Tags: Morphology & Physiology

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