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Scientifically named Clione limacina, they are protandrous hermaphrodites, which means they are both male and female during their life cycles, according to Semenov.

Shipworms reproduce in all kinds of ways. Teredo navalis, the naval shipworm, is a protandrous hermaphrodite: it starts out male and turns female.

“The majority of tongue-biting isopods are protandrous hermaphrodites,” says Denham Parker of Rhodes University in South Africa, via email.

Scientists call it protandrous — that is, a male-first hermaphrodite — a phenomenon also seen in certain worms, limpets and butterflies.

The larger-flowered species of Geranium are markedly protandrous, the outer stamens, inner stamens and stigmas becoming functional in succession.