No.42-1 robust cicada

The larvae of the Minmins' fly grow underground for five to six years and hatch on summer evenings. The larva sucks sap from tree roots underground and undergoes five molts before reaching maturity. At maturity, the larva emerges from the ground, climbs a tree, and hatches as an adult.
Bandai Corporation, “The Big Book of Ikimono”:https://gashapon.jp/dangomushi/special/adv_robust_cicada/

In the individual that was CT scanned this time, hatching was interrupted midway through the process, with part of the back cracked and a small portion of the adult body protruding. The scan image shows the adult insect inside and that each part is still a size smaller than the shed shell. The wings are also still covered by the shell and have not yet fully emerged.

One can imagine that molting is a difficult process, especially in the top view image, where the waist area is caught in the shell. This condition suggests that hardening of the outer shell and environmental conditions may have prevented successful hatching.