Xenacanthus

godzillakiryu91  asked:

What is the sharkiest shark to ever shark?

Well, there’s a couple worth mentioning for good candidates. The standard would be Megalodon as shown below, but I have a few others that would qualify for the sharkiest shark. Bigger modern shark doesn’t mean best.

Stethacanthus is a shark that had teeth on it’s head and it’s main pectoral fin. While not the largest or longest lasting, certainly a good tier of sharkiest shark. Plus it’s adorable, and that’s always a good bonues.

Helicoprion was a shark with a whorl like bottom jaw, primarily a squid feeding animal. It took over a hundred years to figure out exactly how it looked, but the image below shows the most recent reconstruction. Not my primary contender either, but a personal favorite.

Xenacanthus was one of the more primitive sharks to exist, and is just one of my favorite prehistoric sharks. If I was going to make a shark monster, this one would provide the base form. Not to mention it was a single genus that survived both the Devonian Mass Extinction and the Permian Mass Extinction, vanishing from the fossil record at the end of the Triassic Period. That is success, and places him at Number 2 for the sharkiest Shark.

Hybodus however, takes the title as the sharkiest shark. Evolving in the Permian era, and lasting til near the end of the Cretaceous. Blending prehistoric and modern parts of sharks, it lasted longer than most, and was able to last in a world of terrifying sea reptiles that would easily hunt down most others. This impresses me the most, and makes Hybodus the sharkiest shark.

Saturday’s shark for SharkWeekSketchJam: the ancient Xenacantus!

Xenacanthus is a genus of prehistoric sharks. The first species of the genus lived in the later Devonian period, and they survived until the end of the Triassic, 202 million years ago. Fossils of various species have been found worldwide.

Xenacanthus had a number of features that distinguished it from modern sharks. This freshwater shark was about one meter (three feet) in length. The dorsal fin was ribbonlike and ran the entire length of the back and round the tail, where it joined with the anal fin. This arrangement resembles that of modern conger eels, and Xenacanthus probably swam in a similar manner. A distinctive spine projected from the back of the head and gave the genus its name. The teeth had an unusual “V” shape, and it probably fed on small crustaceans and heavily scaled palaeoniscid fishes.

As with all fossil sharks, Xenacanthus is mainly known because of fossilised teeth and spines.