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Three types of genital movement, their neural controls, and functional roles were investigated to gain a better understanding of the mechanism underlying autocleaning in the male cricket. The membrane complex consisting of the median pouch and genital chamber floor shows peculiar undulation that is composed of two types of movements: a right-left large shift and small crease-like movements. The large shift was caused by contraction of a pair of muscles (MPA) located anterior to the median pouch, while the crease-like movements were caused by numerous muscle fibers extending over the membrane complex. The MPA and muscle fibers were each innervated by efferent neurons in the terminal abdominal ganglion. Experiments with artificial dirt mimicking a foreign object revealed that the crease-like movements were responsible for dirt transport, while the large shift participated in sweeping the dirt into the lateral pouch as a trash container. On the other hand, the dorsal pouch serving as a template for the spermatophore showed a jerky bending movement. Simultaneous monitoring of the membrane complex and dorsal pouch activities suggested that their movements cooperate to enable the efficient evacuation of waste in the dorsal pouch. Based on the results, we conclude that genital autocleaning supports the production of the spermatophore.

Genital Autocleaning in the Male CricketGryllus bimaculatus(2): Rhythmic Movements of the Genitalia and Their Motor Control