By Ulf J. Borgen, Hans A. Nakrem
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Additional info for Morphology, phylogeny and taxonomy of osteolepiform fish
Sample text
13). This fossa is visible also on the on the right side (Fig. 13). obl, Jarvik 1980a, fig. 81; cf. Fig. 138 and morphologic discussion). In a position that corresponds to the combined positions of the independent element and the myodome that are seen on the left side, the right side of PMO 93553 shows one large cavity. The configurations on left and right sides have tentatively been interpreted in the way that the independent element is missing on the right side and therefore exposes the large cavity.
FOSSILS AND STRATA Posterior to the cosmine-covered part of the frontals there is a bone surface that constitutes the roof of the posterior opening of the cranial cavity. This surface may be either endocranial or part of the frontals. s, Fig. 10C) that divides this bone surface into right and left parts, suggests the latter alternative. On both sides of PMO 93553, level with the posterior end the frontals, the ventral surface shows a transverse ridge. This is more distinct on the right side. ex, Fig.
Ps, Fig. 13) extends posteriorly on both sides of the dental plate. This structure, known from other forms, is usually considered part of the parasphenoid (Romer 1937, p. 19, fig. 4; Bjerring 1967, pl. 2; Jarvik 1972, fig. 92A). i, Fig. 13). dp, Fig. 13) with an anterior margin shaped as an anteriorly pointing V. The surface of the depression is probably mainly constituted by the endocranium. The boundary between endocranium and parasphenoid shelf is not distinct here, but the mesial margin of the acrochordal depression is tentatively interpreted as this boundary.