Ammonoidea - Wikipedia
WebAmmonoids are extinct spiral shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids (such as the living Nautilus).
2.3 Ammonoidea - Digital Atlas of Ancient Life
WebAmmonoidea, 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.
Ammonoid - New World Encyclopedia
WebAmmonoid or Ammonites are an extinct group of marine animals of the subclass Ammonoidea in the class Cephalopoda, phylum Mollusca. Ammonoidea is one of three subclasses of cephalopods, the others being Coleoidea (octopuses, squids, cuttlefishes, extinct belemites), and Nautiloidea (nautilus and extinct relatives).
Fossil Focus: Ammonoids - PALAEONTOLOGY[online]
WebAmmonoids (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.
Ammonite Fossils Unravel the Geological History of Ancient …
WebJul 8, 2023 · The evolution and classification of ammonites reveal a fascinating story of diversification and adaptation over millions of years. Ammonites belong to the subclass Ammonoidea within the class Cephalopoda, which also includes living cephalopods like squid, octopuses, and nautiluses.
Ammonoid | Mesozoic, Extinct, Shell | Britannica
WebMar 22, 2024 · 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).
Ammonoidea: From the Ram’s Horns of the God Jupiter Ammon …
WebAug 23, 2022 · The Ammonoidea constitute a subclass of the Cephalopoda, included in the Phylum Mollusca. They appear in the Devonian and spread in all the seas with a wealth of species of the most varied forms, the most common of which is a …
Ammonoidea | SpringerLink
WebThe Ammonoidea (ammonoids) are an order of the class Cephalopoda (q.v.), phylum Mollusca. The nearest living relative of the ammonoids is the pearly Nautilus of which Oliver Wendell Holmes wrote “ This is the ship of pearl, which, poets feign, /Sails the unshadowed main .”. The hollow shell of most ammonoids is essentially a cone, coiled in ...
The Secret of Ammonoid Success - National Geographic
WebMay 2, 2012 · Such a shame. Ammonoids had a long and successful tenure in the world’s oceans, spanning about 300 million years, and a new paper by Kenneth De Baets and colleagues outlines the evolutionary ...
Ammonoid Habitats and Life History | SpringerLink
WebJan 1, 2015 · Ammonoids probably spawned in benthic, demersal or even midwater habitats (Mapes and Nützel 2009) in the neritic to oceanic zone above the shelf areas and upper slopes (Westermann 1996 ). Females are thought to have laid 100–500000 eggs on the sea floor (r- strategy) or spawned egg masses in the water column.
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