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- Ammonoidea - Wikipedia
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family Nautilidae) [1]
- What is an ammonite? - Natural History Museum
The 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
- 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
- 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
- Ammonoid | Mesozoic, Extinct, Shell | Britannica
ammonoid fossil cephalopod Also known as: Ammonoida, Ammonoidea, ammonite Written and fact-checked by The Editors of Encyclopaedia Britannica
- Ammonites – Fossil Cephalopods, Evolution, and Geological Significance
Ammonites belong to the subclass Ammonoidea, part of the larger class Cephalopoda, which also includes modern squid, octopus, and cuttlefish Their closest living relative today is the nautilus, a shelled cephalopod that still inhabits tropical seas
- Ammonoid - New World Encyclopedia
Ammonoidea is one of three subclasses of cephalopods, the others being Coleoidea (octopuses, squids, cuttlefishes, extinct belemites), and Nautiloidea (nautilus and extinct relatives)
- Ammonoidea - ScienceDirect
Ammonoidea are cephalopods that provide an exceptionally high-resolution marine biostratigraphic scale from Devonian through Cretaceous, including of the iconic ammonites of the Jurassic and Cretaceous
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