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  • plesion Conodonta Eichenberg, 1930 plesion Pteraspidomorphi Goodrich, 1909 Astraspis Heterostraci Lankester, 1868 Arandaspidiformes Ritchie & Gilbert-Tomlinson
    7 KB (651 words) - 12:08, 18 February 2015
  • †Anaspida (e.g., †Birkenia, †Jamoytius) Class 4. †Heterostraci (e.g., †Astraspis, †Pteraspis, †Drepanaspis) Class 5. †Coelolepida (e.g., †Thelodus, †Lanarkia)
    15 KB (1,594 words) - 17:48, 7 July 2015