Hadrodus Leidy, 1858

Poyato-Ariza F. J. & Wenz S., 2002, A new insight into pycnodontiform fishes, Geodiversitas 24 (1), pp. 139-248 : 147

Genus Hadrodus Leidy, 1858

TYPE SPECIES. — By subsequent designation: Hadrodus priscus Leidy, 1858 . Cretaceous from Colombus, Mississippi, USA. “The genus and species are founded upon the fragment of a bone with two teeth, apparently a Pycnodont fish allied to Placodus ” ( Leidy 1858: 167). Holotype of Hadrodus priscus : isolated premaxilla figured in Leidy (1873: pl. 19, figs 17-20).

OTHER SPECIES. — H. marshi Gregory, 1950 , based on premaxilla, prearticular, and fragments of skull roof, lower Senonian from the Niobrara Chalk, Smoky Hill River, Kansas, USA; H. hewletti ( Applegate, 1970) , Mooreville Chalk (Campanian) in Greene County, Alabama. Bell (1986) gathered in a single pycnodontiform taxon the dentitions named Hadrodus and the cranial roof named Hadrodus hewletti and described by Applegate (1970), who considered it as an acipenseriform. This material also includes some lepidotrichia, dorsal scutes, and vertebrae with arcocentra and apparently also autocentra. This fact, and the great resemblance of the skull roof and the dorsal scutes of Hadrodus hewletti with those of the Acipenseridae (e.g., compare Applegate 1970: figs 181, 184E with Hilton & Bemis 1999: figs 5, 6) indicate that these remains do not belong to a pycnodontiform (already suggested by Lambers 1991: 509). This genus is in need of revision, and is not included in the analysis.