vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha Subclass †Heterostraci Lankester, 1868 1 Order †Cyathaspidiformes Kiaer, 1930 2 Order †Tesseraspidiformes Halstead, 1962 3 Order †Corvaspidiformes Stensiö, 1964 4 Order †Pteraspidiformes Berg, 1940 5 Genus †Weigeltaspis Brotzen, 1933