Squids diverged from other cephalopods during the Jurassic era, meaning that they technically evolved more than 100 million years ago. One of the prehistoric squids that our modern-day squids derived from is the fascinating Belemnotheutis antiquus. Scientists tracked this historic squid by using a fossilized ink sac that they found in England.
The Belemnotheutis antiquus has some of the best-preserved fossils. Scientists often refer to these fossils when trying to learn about squid during the Jurassic period. They are said to have become extinct by being poisoned by algal blooms. These blooms often served as a breeding site for thousands of these prehistoric beauties.
- https://a-z-animals.com/animals/squid/10-incredible-squid-facts/
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