of those groups as paraphyletic, as shown in the cladogram below, from Dupret et al. (2009). Classification Order Arthrodira Woodward, 1891 Phlyctaenioidei Miles, 1973 Brachythoraci Gross, 1932 (includes the well-known Dunkleosteus, Dinichthys, etc.) Williamsaspididae White, 1952 Groenlandaspididae Obruchev, 1964 Arctolepididae Stensiö, 1959 Phlyctaeniidae Fowler, 1947 Actinolepidae Gross, 1940 Phyllolepida Stensiö 1934 Wuttagoonaspidae Ritchie 1973 Genera incertae sedis Aethaspis Denison, 1958 (may be within Actinolepidae) Aleosteus Johnson et al., 2000 (may be within Actinolepidae) Anarthraspis Bryant, 1934 (may be within Actinolepidae) Antarctaspis White, 1968 (previously within Antarctaspididae) Antarctolepis White, 1968 Aspidichthys Newberry, 1873 Baringaspis Miles, 1973 (may be within Actinolepidae) Bryantolepis Denison, 1958 (may be within Actinolepidae) Callognathus Newberry, 1890 Copanognathus Hussakof & Bryant, 1920 Carolowilhelmina Mark-Kurik & Carls, 2002 Diplognathus Newberry, 1878 Erikaspis Dupret, Goujet, & Mark-Kurik, 2007 Eskimaspis Dineley & Yuhai, 1984 Glyptaspis Newberry, 1890 Grazosteus Gross, 1958 Heightingtonaspis White, 1969 (may be within Actinolepidae) Hollardosteus Lehman, 1956 Kujdanowiaspis Stensiö, 1942 (may be within Actinolepidae) Lataspis Strand, 1932 (may be within Actinolepidae) Laurentaspis Pageau, 1969 Lehmanosteus Goujet, 1984 (may be within Actinolepidae) Machaerognathus Hussakof & Bryant, 1919 Maideria Lelièvre, 1995 Mediaspis Heintz, 1929 (may be within Actinolepidae) Murmur Whitley, 1951 Overtonaspis White, 1961 Phylactaenium Heintz, 1934 Pinguosteus Long, 1990 (may be within Brachythoraci) Prescottaspis White, 1961 Proaethaspis Denison, 1978 (may be within Actinolepidae) Qataraspis White, 1969 Sigaspis Goujet, 1973 (may be within Actinolepidae) Simblaspis Denison, 1958 (may be within Actinolepidae) Taunaspis Schmidt, 1933 Timanosteus Obrucheva, 1962 Trachosteus Newberry, 18903 (may be within Coccosteidae) Wheathillaspis White, 1961 Yujiangolepis Wang & Dupret, 2009 (previously within Antarctaspididae) References Further reading (1996): The Rise of Fishes: 500 Million Years of Evolution. Johns Hopkins University Press, Baltimore. Prehistoric fish orders Articles which contain graphical timelines