#ancient sharks

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Shark News!! Fossil of an ancient shark that swam in the age of dinosaurs solves centuries-long mystery

🦈🦈🦈🦈🦈🦈🦈🦈🦈🦈🦈🦈🦈

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Ancient Elasmobranchii

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A mystery surrounding Cladoselache is that of its missing claspers. Despite there being strong evidence of these reproductive organs in its contemporaries, there is no indication that any of the known specimens had them.

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Cladoselache, who lived about 370 mya, is one of the most well-known early sharks. Like most sharks of its time, Cladoselache had a jaw entirely fused to its head, and did not have dermal denticles- its skin was smooth.

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Bandringa resembled a modern-day sawfish or paddlefish, and are among the earliest closest relatives of modern day sharks.

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Featured Species: Japanese Bullhead Shark (Heterodontus japonicus)

Featured Species: Japanese Bullhead Shark (Heterodontus japonicus)

This week’s featured species is a strikingly beautiful species from the Northwestern Pacific Ocean. The Japanese Bullhead Shark (Heterodontus japonicus) is a small shark, typically reaching lengths of 3.5 feet (1.2 m). They have stocky, blunt heads with prominent eye ridges (Ebert, Fowler, & Dando, 2015). As juveniles, they have 12 irregular dark saddle-like bands along their bodies. As they age,…

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SPECIES: Tooth Whorl Shark (Helicoprion) PRICE: $5 USD / 500 DA Points EXTRAS: N/A

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Buzzsaw-toothed leviathans cruised the ancient seas

The so-called “buzzsaw shark” Helicoprion was a prominent feature of the oceans roughly 290 to 250 million years ago. Known mostly for its strange spiral set of teeth, it was also a titanic marine monster that sometimes stretched more than 12 meters in length and was the biggest marine animal of its day.

Helicoprion had a whorl of teeth that fit into the front of its jaws, with some whorls reaching remarkable sizes.

Image by Julio Lacerda / @paleoart