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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 .
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. Lists of various prehistoric fishes include: List of prehistoric jawless fish; List of ...
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.
Boaters have been injured, killed by Gulf sturgeon that jump out of the water. They can grow longer than 6 feet & have fleshy "whiskers" on its snout
The shape of Megapiranha's teeth is inferred to effectively focus stress at the tip of the teeth while piercing flesh before distributing its impact stresses throughout the base of the tooth while crushing hard material such as bones in a similar fashion to how pacus crack hard-shelled fruits and nuts.
Inside the stout fins of a fish that prowled the shallow waters of an estuary in what is now eastern Canada about 380 million years ago, scientists have found what they call the evolutionary ...
Using three tests, researchers determined that the 780,000-year-old bones indicated that humans cooked fish before eating it, according to the study. This marks the earliest evidence that hominins ...
Brachydegma is an extinct genus of prehistoric freshwater ray-finned fish that lived during the Leonardian age (Cisuralian/lower Permian) in what is now Texas, United States.It is known from two fossils, which were recovered from the Clear Fork Formation.