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Orthocereas were squid like marine mosques that lived 480 million years ago during the Ordovician Period. Also known as straight horns, they were slender and arranged from a few inches to over 6 feet in length and crawled along the ocean floor,. This fossil was found in Morocco. Sea Urchins known as echinoids are related to sand our and starfish they have a hard cell which is covered with spines to help fend off predators. The spines usually fall off when they die so finding one with spines is very rare. They lived 500 million years ago. Fossil fish. (Knightia Eocaena) were the smallest freshwater fish that thrived during the Eocene Epoch around 50 million years ago. An average 2.5 to 4 inches. They were related to modern day, herrings, and sardines, and traveled in schools. Ammonites were squid like marine mollusks that first appeared 240 million years ago during the Triassic period and went extinct with the dinosaurs.