Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 480 FIELDIANA: GEOLOGY, VOLUME 11 Fig. 92. Aethaspis major, median dorsals (X 3/4). A, inner side, PF 907; B, outer side of juvenile, PF 563; C, outer side, PF 910. able specifically and generically. They will be described separately below, although presumably some of them belong to Aethaspis. A suborbital plate (PF 1403, figs. 94, C; 106, F) resembles A. utahensis in ornament and is referred to that species. It is of particular interest since this plate has been described adequately only in Phlyctaenaspis amo
Early Devonian fishes from Utah : Arthrodira earlydevonianfis119deni Year: 1953 480 FIELDIANA: GEOLOGY, VOLUME 11 Fig. 92. Aethaspis major, median dorsals (X 3/4). A, inner side, PF 907; B, outer side of juvenile, PF 563; C, outer side, PF 910. able specifically and generically. They will be described separately below, although presumably some of them belong to Aethaspis. A suborbital plate (PF 1403, figs. 94, C; 106, F) resembles A. utahensis in ornament and is referred to that species. It is of particular interest since this plate has been described adequately only in Phlyctaenaspis among the Arctolepida (Heintz, 1933, pp. 128-129, figs. 1, 2). The suborbital of Aethaspis is nearly flat and lacks the medially curved lower edge of Phlyctaenaspis. The anterior, suborbital process is rela- tively deeper, and the posterior 'blade' is not as deep as in Phlyct- aenaspis and has nearly straight, sub-parallel, dorsal and ventral edges. The dorsal margin of the 'blade' has a narrow, unornamented external surface for articulation with the inner side of the postorbital. The posterior edge is thick and must have had a harmonic suture
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