Assertion: echinoderm's appearance | /r/HasProperty | cinctan
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text: Clade richness increased to 15 by the middle Cambrian (Fig. 4) largely due to the first appearance in the fossil record of lateralized echinoderm groups [stylophorans (Fig. 5), cinctans, solutes, and ctenocystoids (Fig. 6)], edrioasteroid groups, and erect pentaradiate groups [e.g., gogiids (Fig. 6), imbricates, and helicocystoids].