FIGURE 1. The stylophoran Ceratocystis.
From the following article:
Palaeoanatomy and biological affinities of a Cambrian deuterostome (Stylophora)
Sébastien Clausen and Andrew B. Smith
Nature 438, 351-354 (17 November 2005)
doi:10.1038/nature04109
a, Basic anatomical features. b–d, Three current interpretations of the soft-tissue anatomy of the stylophoran appendage in proximal longitudinal (left) and distal transverse (right) section: primitive echinoderm model (b), calcichordate model (c) and crinozoan model (d).
