Members of phylum Ctenophora are diploblastic but lack cnidocytes.

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Ctenophora

Also known as comb jellies, a phylum of invertebrate marine animals characterized by their gelatinous bodies and rows of ciliary plates for locomotion.

Diploblastic

Animal body plan in which there are only two embryonic tissue layers, the ectoderm and endoderm. Compare with triploblastic.

Cnidocytes

Specialized cells found in cnidarians (e.g., jellyfish) that contain a stinging structure used for capturing prey and defense.