claspers

/ ˈklɑːspəz /

plural noun

a paired organ of male insects, used to clasp the female during copulation
a paired organ of male sharks and related fish, used to assist the transfer of spermatozoa into the body of the female during copulation

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Dermal denticles, including the ones on the spotted ratfish's pelvic claspers, do not have a dental lamina.

Spotted ratfish also use pelvic claspers for mating, similar to many other cartilaginous fish.

But apart from the denticles on their pelvic claspers, spotted ratfish are largely smooth-skinned.

Its development aligns instead with the pelvic claspers, suggesting that the migrant tissue is now regulated by other networks.

“And two penises. They’re called claspers,” Fred added, raising his eyebrows.