The correct option is D Cnidoblast
Epidermal scales are skin derivation of reptiles that serve in insulation and protection. Claws are also skin-derived structures present in mammals. Vertebrates like Jawless fishes and some amphibians (urodela) have tails. Cnidoblasts are the stinging cells that belong to phylum Cnidaria (invertebrates). Thus, the correct answer is option D.