Eximipriapulus, a type of Priaulid (Priapulan) worm that lived approximately 500 million years ago occupying the shell of a deceased creature. Priapulids (Priapulans) are still around today and are commonly called "penis worms". Credit: Zhang Xiguang

Ancient Squatters: Hermit Behavior in Cambrian “Penis worms” (Priapulids)

Move over, hermit crabs! A 2021 paper published in the journal Current Biology suggests similar shell-occupying behavior in an unexpected source: Cambrian priapulid (priapulan) worms, also known as “penis worms” due to their gross morphology (overall shape of the organism) bearing a remarkable similarity to the human penis. World class quality “penis worm” fossils can be found at the Walcott […]

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