Polyps and sclerites of Callozostron carlottae from NA64-77-01-A. a lateral stereo view of two polyp whorls b–d lateral stereo views of three polyps showing spinose marginal and submarginal scales and non-spinose proximal body wall scales e opercular scales f lower, non-spinose body wall scales g wide base of marginal scales h spinose submarginal scales i marginal scales j coenenchymal scales.