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Ptychodus (from Greek: πτυχή ptyche 'fold' and Greek: ὀδούς odoús 'tooth') [1] is a genus of extinct large durophagous (shell-crushing) lamniform sharks from the Cretaceous period, spanning from the Albian to the Campanian. [2] Fossils of Ptychodus teeth are found in many Late Cretaceous marine sediments worldwide. [3]
The shark is believed to be an ancestor of the great white shark. It is now extinct, but its teeth once spanned up to 8.9 cm (3.5 inches) in length, while adults could grow to near seven meters in ...
Cretoxyrhina (/ k r ɪ ˌ t ɒ k s i ˈ r h aɪ n ə /; meaning 'Cretaceous sharp-nose') is an extinct genus of large mackerel shark that lived about 107 to 73 million years ago during the late Albian to late Campanian of the Late Cretaceous.
The behemoth clocked in at a whopping 6 1/6 inches in length—roughly the size of a human hand!
The sharks were about 50 feet long, experts say.
Aquilolamna is an extinct genus of shark-like elasmobranch from the Late Cretaceous ()-aged Agua Nueva Formation of Mexico.It is currently known to contain only one species, A. milarcae, also known as the eagle shark, and it is classified in its own family Aquilolamnidae, which has been tentatively assigned to the mackerel sharks.
Paleontologists discovered the fossilized remains of an aquatic “dragon” that prowled the Pacific Ocean millions of years ago. The monstrous predator — which measured as long as a great ...
The extant species of frilled shark, C. anguineus and C. africana, do not have a defined breeding season, because their oceanic habitats register no seasonal influence from the ocean's surface; [16] the male shark reaches sexual maturity when he is 1.0–1.2 m (3.3–3.9 ft) long, and the female shark reaches sexual maturity when she is 1.3–1 ...