A collaborative research group between the University of Tsukuba and Fukushima University has used a scanning electron microscope to examine in detail the entire developmental process from eggs to adults of Futahoshikoorugi, and the evidence of the wings has been insufficient. Settled a long controversy over the origin.
Insects are one of the most prosperous fauna on the planet, and one of the factors behind their prosperity is the acquisition of "wings" and specialized "limbs" that enable them to enter the air. It is believed that it was large.In addition, since it was important to develop a "side plate" that can withstand the force of strong muscles while flexibly connecting the wings and limbs to the body, it is necessary to know the origin of the side plate in order to understand the evolution and prosperity of insects. Indispensable, this issue has long been controversial.
This time, the group traced the developmental process of insects in detail and revealed for the first time the origin of the "side plate," which is the body wall that covers the sides of the chest that receives the wings and limbs.Furthermore, we succeeded in establishing the boundary between the back plate and the limb (back plate-limb boundary BTA).As a result of these achievements, the body of the wing is derived from the area behind the BTA, that is, the "lateral tergum", while the joints of the wing and the muscles that move the wing are located in the area that is ventral to the BTA, that is, the limbs (most proximal phalanx). It was shown to be derived from the subproximal phalanx, i.e. side plate).This strongly supports the "dual origin theory" of the wing.
With this result, the origins of the side plates and wings have been clarified, and it is expected that a convincing scenario that explains the evolution of insects can be drawn in the future.
Paper information:[Scientific Reports] Embryological Evidence Substantiates the Subcoxal Theory on the Origin of Pleuron in Insects
