What are the weirdest shark species?

If Steven Spielberg’s film Jaws gave them a bad reputation, few sharks are really dangerous to humans. Of the almost 530 species recorded in 2014 and classified within the clade Selachimorpha, only twenty-five have been involved at least once in an accident. Three are particularly concerned and responsible for the majority of fatal attacks: the great white shark, the tiger shark and the bulldog shark. But sharks are a particularly diverse group, with sometimes astonishing particularities and characteristics.

⋙ England: First shark attack in 175 years?

Sharks with remarkable abilities

For example, more than fifty species of sharks have “photophores” on their ventral parts, i.e. bioluminescent organs that allow them to hide their silhouettes from the eyes of their predators and their prey below. of them. Still others have changed little over the last few million years and have an… unsightly physique. And if it is the so-called “ugly” fish that are most threatened – because yes, sharks are large cartilaginous fish – a CNRS study shows that it is these less attractive species that have the greatest ecological interest. Find out more in this gallery of the 10 species of sharks with strange physiques and abilities.

IN IMAGES, IN PICTURES 10 Species Of Sharks With Weird Physics And Abilities

To learn more about the “powers” of sharks

Did you also know that depending on the species, the shark replaces its damaged teeth every eight days… to several months? This is called the polyphyodont dentition. When this “dental replacement” is done gradually in some people, the ferocious shark (Isistius brasiliensis) renews the entire row each time. According to the book Sharks and rays from around the world (written by Andrea and Antonella Ferrari and published in 2009), individuals of certain species would lose a total of more than 30,000 teeth during their lifetime.

With such teeth, sharks have few competitors in the oceans and seas. It is thus predators that constitute the last link in the marine food chain, essential to the balance of ocean life. But while most sharks are “super predators,” the largest species — the whale shark (Rhincodon typus) and the basking shark (Cetorhinus maximus) — feed mainly on plankton, peacefully filtering the water. The tiburo hammerhead shark (Sphyrna tiburo), as for him, would also delight in sea grasses, making him the first shark on the “omnivorous diet”.

⋙ What is the difference between a whale shark and a basking shark?

The Greenland shark (Somniosus microcephalus), it is distinguished by its longevity. While most sharks live between 10 and 80 years, the animal lives on average 272 years and could even reach 400/500 years. It also has the most toxic flesh in the world, due to its high content of uric acid and trimethylamine oxide. More generally, the flesh of sharks – yet still consumed in many countries – is strongly discouraged for consumption: it can be contaminated with toxins (ciguatoxin, for example) or even heavy metals (mercury, in particular).

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