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The youngest and first tooth at the center of the spiral, referred to as the "juvenile tooth arch", is hooked, but all other teeth are generally triangular in shape, laterally compressed and often serrated. [7] Tooth size increases away from the center of the spiral (abaxial), with the largest teeth possibly exceeding 10 cm (3.9 in) in length.
Members of the Eugeneodontiformes are further classified into different families, the most well-preserved members that have been discovered are commonly placed within the families Helicoprionidae ("spiral saws"), and Edestidae ("those which devour"), the former containing the genera Helicoprion, Sarcoprion, and Parahelicoprion, and the latter ...
Ornithoprion is a genus of extinct cartilaginous fish in the family Caseodontidae. The only species, O. hertwigi, lived during the Moscovian stage of the Pennsylvanian, between 315.2 and 307 million years ago, and is known from black shale deposits in what is now the Midwestern United States.
Onychodus (/ ɒ ˈ n ɪ k ə d ə s /, from Greek meaning "claw-tooth") [1] is a genus of prehistoric lobe-finned fish which lived during the Devonian Period (Eifelian - Famennian stages, around 374 to 397 million years ago). It is one of the best known of the group of onychodontiform fishes.
One of the coolest, most prehistoric-looking fish lives in Florida’s offshore waters of the Gulf of Mexico. It happens to be one of the best to eat but also one of the most elusive.
It has been noted that the teeth of Cenozoic Cylindracanthus are much smaller than the already-small teeth of the Cretaceous Cylindracanthus, suggesting that the teeth may have been a vestigial structure that became gradually reduced over time. It is also uncertain whether the spines are really rostra, or may instead be the ray spines of a fish ...
The photos were posted on Facebook by a woman who said she reeled it in near the Stockton Boat Docks. Many are now Rare fish with 'human-like' teeth found in Delta
A mysterious "monster" fish with teeth washed up on shores of a California park in a "very rare" sighting on Friday, 13 October. Crystal Cove State Park posted images of the specimen on their ...