Kamacuras were a species of giant praying mantises from the Godzilla series of movies that served as a major antagonist of Son of Godzilla and Godzilla: Final Wars.
Son of Godzilla
In the Kamacuras first appearance, they are the secondary antagonists of the film. The Kamacuras was already the size of a full-grown human being living on Sollgel Island when a radioactive accident during a weather experiment mutated them to even larger proportions.
Three find Minya's egg and crack it open, revealing Minya. They attack him but his cries are answered by Godzilla, who comes and kills two Kamacuras, while the third flees.
The third eventually returns and attacks Saeko, but Minya intervenes and confronts the giant insect. Minya is quickly overpowered and just as the Kamacura is going to kill him, Godzilla saves him again and defeats the mantis. However, their battle awakens the giant spider Kumonga, who captures Minya and the Kamacura in webbing. Kumonga then injected poison into the mantis, killing it.
All Monsters Attack
In this film, the Kamacuras first appeared atacking Godzilla, but Godzilla quickly kills two, the first by burning it with his atomic breath, and the second by pummeling it and then buring it. The third flees. Very shortly after, a Kamacura, possibly the third, appears again and chases the young boy Ichiro, who falls down a hole. The Kamacura is unable to chase Ichiro any further and leaves. Not only does this take place in the mind of Ichiro, but most of this is actually stock footage from Son of Godzilla.
Godzilla vs Gigan
A Kamacura appears in Ogasawara, living in peace with the other monsters.
Godzilla: Final Wars
A Kamacura was among the monsters brainwashed by the Xilians. It attacked Paris, and clashes with a warship called the Ecalir, but is beamed away by the Xilians to make it look like they saved the world by eliminating the kaiju. When they are found out, the monsters are sent again to finish the job. However, Godzilla is released and fights the Kamacura, easily defeating it by impaling it on an electric transmission tower, killing it.