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Helicoprion is a genus of extinct shark-like [1] eugeneodont fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls", which in life were embedded in the lower jaw. As with most extinct cartilaginous fish, the skeleton is mostly unknown.
A fossil specimen of Onychodus from Western Australia was found with a placoderm fish half its length logged in its throat. [20] [21] This interesting find was described and illustrated by Dr. John A. Long. [4] [19] [21] The pectoral fins were strong enough for the animal to "walk" around the sea floor in search of a hiding place between coral ...
The study of prehistoric fish is called paleoichthyology. A few living forms, such as the coelacanth are also referred to as prehistoric fish, or even living fossils, due to their current rarity and similarity to extinct forms. Fish which have become recently extinct are not usually referred to as prehistoric fish.
Helicoprion bessonovi, teeth at the front of the lower jaw (reversed for more natural position) Restoration of Romerodus (Caseodontidae). The Eugeneodontiformes, (also called Eugeneodontida) is an extinct and poorly known order of cartilaginous fishes.
Orodus (from Greek: ωραίος oraíos, 'beautiful' and Greek: ὀδούς odoús 'tooth') [1] is an extinct genus of orodontiform cartilaginous fish. Fossils are known from the late Devonian to Late Carboniferous of Europe, Asia and North America. Most species are only known from their rounded, ridge covered teeth, designed for crushing prey ...
Living Fossil: the Story of the Coelacanth. W. W. Norton. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 364: 560. Archived from the original on 20 February 2009; Weinberg, Samantha (1999). A Fish Caught in Time: The Search for the Coelacanth. Fourth Estate. Bruton, Mike (2015).
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.
Placoderms were among the first jawed fish (their jaws likely evolved from the first pair of gill arches), as well as the first vertebrates to have true teeth. They were also the first fish clade to develop pelvic fins , the second set of paired fins and the homologous precursor to hindlimbs in tetrapods .