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double-walled cone-shaped skeletons formed some of Earth’s earliest reef ecosystems before most species went extinct by the Middle Cambrian
Modern Homola species are known as “carrier crabs” for their behaviour of carrying sponges or debris for camouflage
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Australian fossil ammonite ("Myloceras ammonoide") Astronomy equipment double-walled cone-shaped skeletons formed someMyloceras ammonoides (Millstone Horn Ammonite) is an extinct marine cephalopod from Australias Cretaceous inland seas. This species is dated to approximately 100113 million years ago (Cretaceous) and is known from the Allaru Formation, Currane Station, Ilfracombe, Central West Queensland. The specimen represents a nektonic mollusc that swam within the warm shallow waters of the Eromanga Sea system. Originally described by Dr Frederick W Whitehouse in