Deuterostomes

ter the sponges led to a phylum of animals called the cnidarians (phylum Cnidaria). These animals are diploblastic (have two cell layers) and have a blind gut with only one entrance (the mouth/anus). Despite their relative structural simplicity, cnidarians have structural molecules (such as collagen, actin, and myosin) and home-obox genes.

(a) Anthopleura elegantissima

(a) Anthopleura elegantissima

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