The spiral-flanged egg case of a Horn Shark

Why are sharks born from spirals? No, this is not a strange sea pebble. And no, this is not a drill that fell off the installation. You will be surprised, but what you see is an egg. And even more surprised when you find out that the egg is a shark!


The spiral-flanged egg case of a Horn Shark
That embarrassing feeling when I came to visit the girl and saw something very similar to a shark egg on the table ...


Why are sharks born from spirals?

You may be outraged: “But how? From school, we were told that sharks were viviparous. ” Indeed, most sharks are either viviparous or ovoviviparous. And only 30% of these waterfowl predators turned into hens.


The spiral-flanged egg case of a Horn Shark
Strange you have some Luntik ...

These eggs can be different. And spiral, and in the form of an anchor, and with all kinds of processes - in short, the fantasy of sharks in this matter is truly limitless. They stuffed their kids into such strange capsules not because of their designer quirks. All sharks are united by one thing - defenselessness.
 
The spiral-flanged egg case of a Horn Shark
The spiral-flanged egg case of a Horn Shark

Shark eggs develop for a long time - 5-7 months. And all this time, like caviar, they are a light snack for predators of all stripes. But sharks are threatened not only by marine inhabitants, but also by the sea itself. The current and waves can easily lay an egg ashore. Therefore, each of the structures serves its own purposes.
 
The spiral-flanged egg case of a Horn Shark
This baby was pushed ashore, he was found already dead.

For example, a spiral horned shark egg, covered with a cornea, perfectly protects the fetus from carnivores. And the numerous threads on the cat shark egg help the fetus gain a foothold in the ground so that it does not go ashore. And some, for example, polar sharks, take a blende. At once give birth to 500 pieces of eggs, of which only 10 are fertilized. 
More articles at → Wikipedia | Sciencefriday.com
 
The spiral-flanged egg case of a Horn Shark
A whale shark egg reaches 70 cm in length and 40 in width. You can’t eat an egg of this size with all your desire.

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