| List of Terms | Taxonomic Terms | |
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Cambrian Ordovician Silurian Devonian Paleozoic Carboniferous hydroxyapatite dorsal fin anal fin pectoral fin pelvic fin ciliary filter feeding muscular filter feeding muscular pharynx calcium phosphate calcium carbonate lateral line system pineal organ median eye hypocercal heterocercal epicercal denticles odontodes foramina foramen dermal bone degenerate rudimentary semicircular canal aneural heart anadromous estuarine convergence innervated heart flow-through ventilation tidal ventilation ammocoete metamorphosis exotic species gnathostome agnathan vertebral centrum tooth whorl epaxial muscles hypaxial muscles conus arteriosus branchial arch mandibular arch palatoquadrates pitch yaw roll fin-fold theory collagenous fin rays | ostracoderm Myllokumingia conodonts Heterostraci Thelodonti Coelolepida cephalaspida Osteostraci Galeaspida Pituriaspida Anaspida Myxinoidea hagfish Petromyzontoidea lamprey Placodermi Acanthodii |