Each brisingid pedicellariae jaw is about 0.4 millimeters (0.02 inches) across. Hundreds of millions of these are present on each spine, forming the 'death velcro.'

Each brisingid pedicellariae jaw is about 0.4 millimeters (0.02 inches) across. Hundreds of millions of these are present on each spine, forming the “death velcro.” Image courtesy of Bob Ford and Chris Mah.

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