Having trouble writing lyrics to your power-metal opus? Look no further than phylum Vertebrata1. Extant vertebrates comprise two clades: the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
• Mineralized exoskeleton, sensory-line canals and grooves.
• Metamerically arranged endoskeletal elements flanking the spinal cord.
• Atrium and ventricle of heart closely-set.
Those traits are pretty fucking metal.
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