Adamsoceras
Extinct genus of cephalopods
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Adamsoceras is a genus of actinocerids of the family Wutinoceratidae, with spheroidal siphuncle segments like Ormoceras, but having a reticular canal system like Wutinoceras. Adamsoceras has a slender, gently expanding, orthoconic shell that is slightly broader than high, i.e. depressed, with close spaced septa that form ventral lobes and a siphuncle that is near the ventral margin.
| Adamsoceras Temporal range: Ordovician | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Actinocerida |
| Family: | †Wutinoceratidae |
| Genus: | †Adamsoceras Flower, 1957 |
| Species[1] | |
| |
Adamsoceras is known from rocks of Whiterockian age (early Middle Ordovician) in Nevada, the Baltic, Tasmania, and Manchuria. It may have been derived from Wutinoceras, or from a common ancestor, and gave rise to Ormoceras.
The genotype is Adamsoceras isabelae from the upper Pogonip Group in Ikes Canyon in the Toquima Range in Nevada.[2]