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#silurian #phragmoceras #nautilodea #paleolites
Published: 2020-12-30 22:40:06 +0000 UTC; Views: 2339; Favourites: 58; Downloads: 4
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Description
Phragmoceras
North America Europe Asia
1839
A nautiloidean with a characteristic shell that curves on top and becomes wider at the bottom, its known from fragments of its shell
ALT: the hole in the back is for an organ known as a siphuncle, which cephalopods use to lower its density and float underwater
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