Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Class †Placodermi McCoy, 1848 Order †Stensioellida Romer, 1945 [monotypic] see Order Stensioelliformes Family †Stensioellidae Berg, 1940 [monotypic] 1 Genus †Stensioella Broili, 1933