The Function of the Claspers and Clasper-Glands in the Skate

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Abstract
The clasper is erected by powerful adductor muscles as well as by vascular dilatation and is used as an organ of intromission. The gland secretes simultaneously from all its papillae a fluid which washes sperm down the clasper-tube into the female's cloaca. A centre for clasper erection exists in the cord between spinal nerves 48 to 50. In a spinal male tapping on the anal region causes a reflex erection of the claspers. Adrenaline apparently lowers the stimulus threshold for clasper erection.

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