The Nautiloidea comprises a subclass of cephalopods, all of which possess an external shell. They flourished during the Early Paleozoic era, where they constituted the main predatory animals, and developed an extraordinary diversity of shell shapes and forms. Some 2,500 species of fossil nautiloids are known, but only a handful of species survive to the present day.
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| - The Nautiloidea comprises a subclass of cephalopods, all of which possess an external shell. They flourished during the Early Paleozoic era, where they constituted the main predatory animals, and developed an extraordinary diversity of shell shapes and forms. Some 2,500 species of fossil nautiloids are known, but only a handful of species survive to the present day.
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| - : Plectronoceratoidea
:: Plectronocerida
:: Ellesmerocerida
:: Protactinocerida
:: Yanhecenida
: Endoceratoidea
:: Endocerida
:: Intejocerida
: Actinoceratoidea
:: Actinocerida
: Discosoratoidea
:: Discosorida
: Nautilitoidea
:: Tarphycerida
:: Oncocerida
:: Nautilida
: Orthoceratoidea
:: Orthocerida
:: Ascocerida
:: Pseudorthocerida
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| - (Agassiz, 1847)
- Nautiloidea
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| - The Nautiloidea comprises a subclass of cephalopods, all of which possess an external shell. They flourished during the Early Paleozoic era, where they constituted the main predatory animals, and developed an extraordinary diversity of shell shapes and forms. Some 2,500 species of fossil nautiloids are known, but only a handful of species survive to the present day.
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