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ammonoid, any of a group of extinct cephalopods (of the phylum Mollusca), forms related to the modern pearly nautilus ( Nautilus ), that are frequently found as fossils in marine rocks dating from the Devonian Period (began 419 million years ago) to the Cretaceous Period (ended 66 million years ago). The ammonoids were shelled forms, and nearly ...
Mollusca – 2. Cephalopoda –– 2.1 Cephalopoda stem groups –– 2.2 "Nautiloidea" –– 2.3 Ammonoidea ← –– 2.4 Coleoidea –– 2.5 QuizAbove: Diorama reconstruction of Cretaceous sealife that once lived in Tennessee; on exhibit at the American Museum of Natural History, New York. Photograph by Jonathan R. Hendricks.Ammonoidea, or ammonoids, constitute one of the most important ...
Ammonites are perhaps the most widely known fossil, possessing the typically ribbed spiral-form shell as pictured above. These creatures lived in the seas between 240 - 65 million years ago, when they became extinct along with the dinosaurs. The name 'ammonite' (usually lower-case) originates from the Greek Ram-horned god called Ammon.
Ammonites are a distinctive class of extinct invertebrates within the Phylum Mollusca. These spectacular looking marine animals thrived in the Paleozoic and Mesozoic Eras, which equates to approximately 408 to 65 million years ago. The Ammonoidea are ancient cephalopods that are closely related to the modern day chambered Nautilus, cuttlefish ...
1886 Items ($3 to $19,500) 9.5" Brilliant Red Ammonite Preserved In Precious Ammolite. $19,500. 9.8" Brilliant Ammonite Fossil Preserved In Precious Ammolite! $19,500. 13" Impressive Promicroceras Ammonite Cluster - Somerset, England. $2,950. 14.3" Honey-Orange Ammonite (Argonauticeras) - Befandriana, Madagascar.
We now know ammonites are extinct cephalopod molluscs related to squids and octopuses, which lived in the seas of the Mesozoic Era between about 201 and 66 million years ago. They are preserved as fossils. But before science had an answer, ammonite fossils were mysterious objects that gave rise to rich and fascinating folklore all over the world.
8 de jul. de 2023 · Amonites são moluscos marinhos extintos que pertencem à classe Cephalopoda e à subclasse Ammonoidea. Foram criaturas difundidas e diversas que viveram nos oceanos desde o período Devoniano, há cerca de 400 milhões de anos, até o final do período Cretáceo, há cerca de 66 milhões de anos, quando foram extintos junto com os dinossauros. As amonitas estavam entre os organismos marinhos ...
