Wells, A.; Houston, W. W. K. (2001). Mollusca: Aplacophora, Polyplacophora, Scaphopoda, Cephalopoda. <em>Zoological catalogue of Australia, 17(2). CSIRO Publishing (Commonwealth Scientific and Industrial Research Organization): Melbourne. ISBN 0-643-06070.</em> [details]
two distinct size classes, 4-18 mm ML and 90-210 mm ML, with the modes at 12 mm and 135 mm