FIGURE 2 in Sturgeons (Acipenseridae) from the Late Miocene of Ukraine, with a discussion of materials associated with Widhalm's (1886) nomen nudum, †Acipenser euhuso

FIGURE 2. Isolated and fragmentary dermal skull of a sturgeon (Acipenseridae indeterminate genus) from the Pontian of Ukraine. A, external and B, internal surfaces of a portion of a possible parietal (PM ONU 3475/31). C, external surface of an isolated dermal bone, possibly a dorsal rostral bone (PM ONU 3475/32). D, external surface of a fragmentary posttemporal (in matrix) (PM ONU 3475/33). E, external and F, internal surfaces of a fragmentary subopercle (PM ONU 3475/34). G, external surface of a dermopterotic (in matrix) (PM ONU 3475/35). H, external surface of an unidentified dermal bone (in matrix) (PM ONU 3475/36). I, external, and J, internal surfaces of a possible median extrascapular (PM ONU 3475/37). K, L, M, N, and O, external surfaces of unidentified dermal bone (PM ONU 3475/38, 39, 40, 41, and 42, respectively). Scale bars in all equal 20 mm.