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.
What is an ammonite? | Natural History Museum
WEBThe subclass Ammonoidea, a group that is often referred to as ammonites, first appeared about 450 million years ago. Ammonoidea includes a more exclusive group called Ammonitida, also known as the true ammonites. These animals are known from the Jurassic Period, from about 200 million years ago.
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).
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). The ammonoids were shelled forms, …
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 …
Ammonoidea - Oxford Reference
WEBThe Ammonoidea were probably tetrabranchiate cephalopods. They constitute the largest cephalopod subclass, with 163 families, including the ammonites, in which the suture lines form very complex patterns; the ceratites, in which part of the suture line is frilled; and the goniatites, which have relatively simple suture lines.
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 …
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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