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Male spiders don’t have a penis, but instead have palpal bulbs at the ends of their front legs that transfer sperm to females.

The palpal bulbs are often covered in rough skin called keels.

Two main groups of nervous tissue were present: a nerve running to the tip of the sex organ, and two clusters of neurons in the palpal bulb—the region of the pedipalps used for transferring sperm.

He then dips the points of his palpal bulbs—black organs at the end of his pedipalps, into the fluid until the bulbs are filled.

He then inserts each sperm-laden palpal bulb into the female’s genital opening.