Apomesodon gibbosus ( Wagner, 1851 ) Poyato-Ariza F. J. & Wenz S., 2002

Poyato-Ariza F. J. & Wenz S., 2002, A new insight into pycnodontiform fishes, Geodiversitas 24 (1), pp. 139-248 : 219

Apomesodon gibbosus ( Wagner, 1851) n. comb. ( Figs 3C ; 14B )

HOLOTYPE. — Specimen figured by Wagner (1851: pl. 3, fig. 2), currently housed at the Bayerischen Staatssammlung für Paläontologie und historische Geologie, München, Germany: AS VII 346.

TYPE HORIZON. — Early Tithonian.

TYPE LOCALITY. — “Solnhofener Plattenkalke”, Bavaria, Germany.

REVISED DIAGNOSIS. — Apomesodon n. gen. with the following unique combination of primitive and derived characters: body depth less than 100% of standard length; dorsal prominence in obtuse angle, with anterior border inclined and posterior border horizontal, and consequently no dorsal apex; extrascapular not fused to parietal; all vomerine teeth (sub)circular; 12 to 13 hypochordal elements in caudal endoskeleton; less than 20 anal axonosts; caudal fin with straight distal border; five or more spines on dorsal ridge scales; more than 21 ventral keel scales; four to six spines on ventral keel scales.

Figures

FIG. 3. — Forms previously referred to the genus Eomesodon Woodward, 1918; A, B, Apomesodon surgens n. gen., n. sp. Part and counterpart of the same specimen, currently housed in different collections; A, MNHN CRN 69; B, ML 15660. Photos Serrette, both under ultraviolet light; C, Apomesodon gibbosus n. comb., JM 4120. Photo courtesy G. Viohl; D, Stenamara mia Poyato-Ariza & Wenz, 2000, silicone cast of the holotype, LH – 14365. Photo Serrette, from Poyato-Ariza & Wenz (2000). Scale bars: A, B, D, 1 cm; C, 5 cm.

FIG. 14. — A, skull of Apomesodon surgens n. gen., n. sp., from specimen ML 15433, holotype. Right side, lateral view. Arrows on the left upper corner points at the portion of the supratemporal commissure piercing the parietal (1) and the dermopterotic (2); arrows on the ethmoidal region point at the tubular infraorbitals (3), the ossicle(s) of the ascending branch of the infraorbital sensory canal (4), and the ossicles of the ethmoid commissure (5). Photo Serrette, under ultraviolet light; B, Apomesodon gibbosus n. comb., ethmoidal and oral region of specimen FSL 93095. Arrows on the left point at the tubular infraorbitals. Photo Serrette. Abbreviations: D, dentary; lPmx, left premaxilla (tooth); rPmx, right premaxilla. Scale bars: A, 1 cm; B, 5 mm.