Orthacanthus is an extinct genus of fresh-water xenacanthiform cartilaginous fish, named by Louis Agassiz in 1843, [3] [4] ranging from the Upper Carboniferous [3] into the Lower Permian. [1] Orthacanthus had a nektobenthic life habitat, with a carnivorous diet. [5]

Fossil of the month: Orthacanthus? This month's fossil is an extremely tiny type of fossil shark tooth. Orthacanthus is one of several types of ancient, strange-looking sharks called xenacanthids.

2024年1月26日 · With an elongate eel-like body, a long dorsal fin extending the length of its back, and a peculiar spine extending backward from the head, the 3-meter-long Orthacanthus was one of the most terrifying inhabitants of freshwater swamps and bayous in ancestral North America and Europe. It fed on fishes and tetrapods.

2022年12月1日 · Orthacanthus is a genus of sharks that went extinct during the lower Permian, meaning around 250 million years ago. It was part of the extinct Orthacanthidae family and consisted of freshwater xenacanthid carnivorous sharks living in Europe and North America. If you’re wondering what xenacanthid means, here’s the answer!

General appearance and parts of the xenacanthid shark, Orthacanthus. Tiny boney teeth and head (or dorsal) spines are the only boney parts usually preserved as fossils, and you may need a magnifying glass to see the teeth.

The original Orthacanthus gracilis fossil was found in Germany and named in 1848. That species gets to keep the name. The remaining two fossils were found in Ohio and named by the famous American paleontologist John Strong Newberry in 1857 and 1875.

Orthacanthus was an apex terror of freshwater swamps in prehistoric North America. Its body reached nearly 10 feet in length, and its powerful jaws were lined with double-fanged teeth. Orthacanthus lived from roughly 280 million years ago during the end of the Permian period

Species of Arachnophyllum. Some of the different characteristics of external features used to differentiate species of Arachnophyllum found in Kentucky (based on information in Foerste (1931), Stumm (1964), and Laub (1979)). More information on internal features can be found in the same references.

2023年8月27日 · Orthacanthus, meaning “straight spine”, was a 10 foot long freshwater shark-like fish which lived during the late Carboniferous Period and early Permian Period roughly 315-275 million years ago.

2013年5月16日 · As the larger of the two,‭ ‬Orthacanthus would have specialised in larger and more powerful prey that it would have seized with its double fanged teeth.‭ ‬The overall eel like body morph of Orthacanthus is a reflection of its habitat.‭ ‬Rather than being a pelagic open seas predator,‭ ‬Orthacanthus hunted in freshwater swamps ...