Hadrosaurus cavatus Cope, 1871

Prieto-Márquez, Albert, Weishampel, David B. & Horner, John R., 2006, The dinosaur Hadrosaurus foulkii, from the Campanian of the East Coast of North America, with a reevaluation of the genus, Acta Palaeontologica Polonica 51 (1), pp. 77-98 : 93

Hadrosaurus cavatus Cope, 1871

Holotype: AMNH 1390 , four caudal centra.

Type locality and horizon: New Jersey, unrecorded locality; New Egypt Formation, Greensand number 5 beds, Cretaceous (from the collection tag; however, Colbert (1948:34) gives the following information: Swedesboro, New Jersey, “probably Navesink Formation”).

Comments.— AMNH 1390 consists of four centra from the mid section of the tail of an indeterminate hadrosaurid ( Fig. 6C). The centra have the hexagonal cranial and caudal surfaces characteristic of hadrosaurids. Two of the specimens preserve a partial neural arch and one centrum preserves a small portion of the neural spine. The reader is referred to Cope (1871) for a detailed description.

Conclusion.— H. cavatus is a nomen dubium in agreement with previous work ( Weishampel and Horner 1990), due to the absence of distinguishing characters.