Cretaceous aquatic ecosystems were amazingly diverse, containing most clades of extant
aquatic vertebrates as well as an array of sharks and rays not present today. Here we report …

Evaluation of two historical collections of Louisiana vertebrate fossils housed in museum
repositories revealed the presence of Paleogene shark and ray taxa that were heretofore …

The late Miocene Gatun Formation of northern Panama contains a highly diverse and well
sampled fossil marine assemblage that occupied a shallow-water embayment close to a …

The fossil fish Ptychodus Agassiz, 1834, characterized by a highly distinctive grinding
dentition and an estimated gigantic body size (up to around 10 m), has remained one of the …

The Neoselachii are a monophyletic group including all of the extant sharks and rays. They
underwent rapid diversification throughout the Jurassic and Cretaceous, going from low …

ABSTRACT Seymour Island, Antarctic Peninsula, is known for its wealth of fossil remains.
This island provides one of the richest fossiliferous Paleogene sequences in the world …

Two new ctenacanthiform sharks representing two families, Ctenacanthidae and
Heslerodidae, have been identified from the Middle to Late Mississippian marine sediments …

Presented here is a comprehensive monograph of all the members of the Late Cretaceous
shark family Ptychodontidae. It is composed of two genera, Paraptychodus and Ptychodus …

Squalicorax Whitley, 1939, is a Cretaceous shark genus in which its teeth are common in
middle Albian to late Maastrichtian marine deposits nearly worldwide (Glikman and …

The extant blacknose shark Carcharhinus acronotus is a small-sized, tropical to
warmtemperate carcharhinid shark occurring along the western Atlantic coasts from North …