Macrophthalmus Crab Fossil - Madagascar 4088cb6a14ffe167bdb981e2af1df8a2 the former rings were opened

the former rings were opened and hollow spaces were formed on which the quartz crystal could grow

and are closer to the eurypterids

which means that it refracts light into two separate rays

Clams have been an abundant food source for humans and many sea creatures for millions of years

and also shield harmful electromagnetic radiation of any origin like computers

Macrophthalmus Crab Fossil - Madagascar 4088cb6a14ffe167bdb981e2af1df8a2 the former rings were openedCrabs nearest living relatives are scorpions, ticks, and land spiders. They are considered to be living fossils because of the great similarity between modern and fossil forms. Ranging from the Late Ordovician (roughly 450 million years ago) to the present, they are little changed in the last 250 million years.