vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha Subclass †Heterostraci Lankester, 1868 Order †Pteraspidiformes Berg, 1940 Suborder †Pteraspidoidei Berg, 1940 Family †Podolaspididae Zych, 1931 Genus †Mylopteraspidella Blieck, 1984 [monotypic] †Mylopteraspidella gracilisᵀ (Stensiö, 1958)