Wiwaxia is a genus of soft-bodied, scale-covered animals known from Burgess shale type Lagerst├Ątte dating from the upper Lower Cambrian to Middle Cambrian. The organisms are mainly known from dispersed sclerites; articulated specimens, where found, range from 3.4 millimetres (0.13 in) to a little over 50.8 millimeters (2 in) in length. They bear a set of mouthparts comprising two to three identical rows of rasping teeth that lay on a supporting apparatus or "tongue"; this feeding arrangement seems to represent a 'prototype' molluscan radula.

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