Muramotoceras Temporal range:
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Fossil of Muramotoceras from Upper Cretaceous of Japan | |
Scientific classification
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Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | † Ammonoidea |
Order: | † Ammonitida |
Suborder: | † Ancyloceratina |
Family: | † Nostoceratidae |
Genus: | †
Muramotoceras Matsumoto, 1967 [1] |
Muramotoceras was an unusual genus of heteromorphic ammonite. [2] It was known only from Japan until researchers reported in 2001 that the genus was present in Alaska's Matanuska Formation as well. [2] Its remains likely date to the middle Turonian (from 89.8 to 93.9 million years ago) in both areas. [2] Subsequently it was also described from the Santonian Gosau Group ( Austria). [3]