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  • Ammonoidea - Wikipedia
    Ammonoids are extinct, typically coiled-shelled cephalopods composing the subclass Ammonoidea
  • Ammonoid | Mesozoic, Extinct, Shell | Britannica
    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)
  • 2. 3 Ammonoidea - Digital Atlas of Ancient Life
    Ammonoidea, or ammonoids, constitute one of the most important clades of extinct invertebrate animals Their lovely shells have long made them favorites of collectors and their fossils have been known since ancient times
  • What is an ammonite? - Natural History Museum
    Ammonites were shelled cephalopods that died out about 66 million years ago Fossils of them are found all around the world, sometimes in very large concentrations The often tightly wound shells of ammonites may be a familiar sight, but how much do you know about the animals that once lived inside? What were ammonites?
  • Fossil Focus: Ammonoids – PALAEONTOLOGY [online]
    Ammonoids (Ammonoidea) are an extinct group of marine invertebrates with an external shell They were cephalopods, and hence closely related to modern cuttlefish, squid, octopuses and the pearly nautilus
  • Ammonoid - New World Encyclopedia
    Ammonoids are excellent index fossils (fossils used to define and identify geologic periods or faunal stages), and it is often possible to link the rock layer in which they are found to specific geological time periods
  • What Is an Ammonoid? Profile of an Extinct Cephalopod
    Ammonoids were extinct marine cephalopods, a group of mollusks that includes modern squids, octopuses, and nautiluses They are classified as the subclass Ammonoidea These animals were free-swimming predators that navigated ancient seas Their fossils are found globally in marine sedimentary rocks
  • Ammonoidea - Paleontology World
    Ammonoids are an extinct group of marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda These molluscs are more closely related to living coleoids (i e , octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species
  • Ammonoid | Paleontology Wiki | Fandom
    Originating from within the bactritoid nautiloids, the ammonoid cephalopods first appeared in the Late Silurian to Early Devonian (circa 400 million years ago) and became extinct at the close of the Cretaceous (65 m y a ) along with the dinosaurs
  • Phylum Mollusca Class Cephalopoda – Subclass Ammonoidea
    There are three types of suture patterns for ammonoids: goniatitic, ceratitic, and ammonitic Ammoinoids with a goniatitic suture are called goniatites, those with ceratitic sutures are called ceratites, and those with an ammonitic suture are called ammonites





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