“Excellent... Those who are interested in vertebrate paleontology or in the scientific history of
the American midwest should really get a copy.”—PalArch's Journal of Vertebrate …

Fossiliferous deposits of the Greenhorn Limestone (Upper Cretaceous) are found on the
Comanche National Grassland in southeastern Colorado. The lowest portion of the …

The first articulated dentition of† Ptychodus from Africa is described herein. The specimen,
likely coming from the Turonian of the Asfla area (Goulmima region, southeastern Morocco) …

Enameloid is a hard mineralized tissue covering chondrichthyan and actinopterygian teeth.
Over the past 40 years, it has been extensively studied in various extinct and extant sharks …

Isolated teeth belonging to the genus Ptychodus Agassiz, 1834 (Chondrichthyes;
Elasmobranchii) from the Upper Cretaceous of the Ryazan and Moscow Oblast regions …

Due to their cartilaginous endoskeleton and the continuous tooth replacement, the
chondrichthyan fossil record predominantly consists of isolated teeth, which offer diagnostic …

Although Ptychodus teeth are well known in Late Cretaceous marine deposits in North
America and Europe and a few specimens with jaw elements have been discovered, the …

ABSTRACT Ptychodus (Elasmobranchii, Ptychodontidae) is an enigmatic durophagous
shark that lived in Cretaceous seas. Based on multiple articulated tooth plates of Ptychodus …

ABSTRACT Ptychodus (Elasmobranchii: Ptychodontidae) is an enigmatic durophagous
shark known from Cretaceous marine deposits nearly worldwide based primarily on isolated …

Ptychodus mortoni Mantell is a Late Cretaceous shark that possessed pavement-like tooth
plates that were used to feed on hard-shelled macroinvertebrates (durophagy). Here, we …