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Teeth with more durable tooth shapes should extend their use and improve predator performance, but past studies have described only the cusped\u2010side of teeth, mostly overlooking morphologies related to functional interactions between teeth. Here, we describe the three\u2010dimensional morphology of the central drilling tooth (rachidian) from four species of the neogastropod family Muricidae using synchrotron tomographic microscopy and assemble a three\u2010dimensional model of a multitooth series in drilling position for two of them to investigate their dynamic form. We find two new types of articulating surfaces, including a saddle joint at either end of the rachidian and a large tongue\u2010and\u2010groove joint in the center. The latter has a shape that maximizes contact surface area between teeth as they rotate away from each other during drilling. 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