Gyrodus Agassiz, 1833

Poyato-Ariza F. J. & Wenz S., 2002, A new insight into pycnodontiform fishes, Geodiversitas 24 (1), pp. 139-248 : 146

Genus Gyrodus Agassiz, 1833

TYPE SPECIES. — By subsequent designation: Stromateus hexagonus Blainville, 1818 . Lower Tithonian from the “Solnhofener Plattenkalke” Bavaria, Germany. Holotype of Gyrodus hexagonus by monotypy: specimen described and figured by Knorr (1755: vol. I, pl. 22, fig. 1), which Blainville (1818: 322) explicitly referred to when creating his new species Stromateus hexagonus . This specimen is not any of those figured by Agassiz (1833: vol. II, pt. 1: 16; pt. 2: 184, 206, pl. 69c, figs 4, 5) or any of the four “type specimens” proposed by Lambers (1991). However, we could not find the type specimen in any of the studied collections.

OTHER SPECIES. — G. circularis Agassiz, 1843 , early Tithonian from the “Solnhofener Plattenkalke” Bavaria, Germany; Gyrodus sp. , Kimmeridgian from Cerin, France; the “ Mesturus verrucosus ” in Saint-Seine (1949) is actually Gyrodus sp. ( Lambers 1991; pers. obs.). Gyrodus sp. , almost complete head with partially exposed vomerine and prearticular dentitions, Oxfordian from Quebrada del Profeta, Chile ( Kriwet 2000). Plus numerous nominal species, in need of revision, based on isolated dentitions (e.g., Woodward 1895a). See Lambers (1991) for a revision of this genus. For “ Gyrodus ” wagneri, see Proscinetes ? wagneri. MATERIAL EXAMINED. — G. hexagonus: BMM 31, 32, 36; JM 3710, SOS 4303 (counterpart of 3710); NHML 1625**, 3772, 3773, 3774, 4633**, 37711; MNHN SLN 5a-b, 22 (juvenile specimen), 49, 206, 208, plus unlabelled cast, probably from the type of G. “ frontatus ”.