Apomesodon, 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 : 144

Genus Apomesodon n. gen.

TYPE SPECIES. — By original designation: Mesodon gibbosus Wagner, 1851 . Early Tithonian of the “Solnhofener Plattenkalke”, Bavaria, Germany. This species is explicitly referred by Wagner (1851: 52) as the Gyrodus gibbosus in Agassiz (1843: 236, name only, without description or illustration, therefore not available). Holotype of Apomesodon gibbosus n. comb. by monotypy: specimen figured by Wagner (1851: pl. 3, fig. 2) as Mesodon gibbosus . It is currently housed at the Bayerischen Staatssammlung für Paläontologie und Historische Geologie, München, Germany, specimen AS VII 346.

OTHER SPECIES. —? Apomesodon comosus ( Thiollière, 1858) n. comb. Kimmeridgian from Cerin, France; poorly preserved form previously described as a Macromesodon by Saint-Seine (1949). Specific name created by Thiollière (1858: 783) as “ Mesodon comosus inédit”. It certainly does not belong to Macromesodon because of its loricate scale pattern, so it is provisionally referred to Apomesodon n. gen. herein. Apomesodon surgens n. gen, n. sp., Kimmeridgian from Cerin, France; initially mentioned as “ Mesodon gibbosus ” by Thiollière (1858: 119), revisited and figured later under the same species name by Thiollière (1871: 33; 1873: 13, pl. 2, fig. 2) and Saint-Seine (1949: 105, 129-132, 313, figs 56-58, pl. 14, fig. A).

MATERIAL EXAMINED. — Apomesodon gibbosus n. comb.: FSL 93095, JM 4120 ( Fig. 3C ) / SOS 3570 (part and counterpart of the same complete specimen, with different labels) ; BMM, one complete, unlabelled specimen. Apomesodon surgens n. gen., n. sp. Holotype: ML 15443 (specimen figured by Thiollière in 1858). Other specimens: ML 15660 , MNHN CRN-69 (counterpart of ML 15660 , as shown by Fig. 3A, B ; complete, well preserved skeleton) .

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.