''Docidoceras'' is an extinct

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

genus from the order

Ammonitida Ammonitida is an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, a ...

that lived during the

Middle Jurassic The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations co ...

. ''Docidoceras'' is included in the family

Otoitidae Otoidtidae: stephanoceratoid ammonitina from the early Middle Jurassic that begin as cadicones but become more planualte with age; derived from the Hammitoceratidae (Hildoceratoidea), probably through '' Erycites'' by way of ''Abbasites''. Sh ...

which makes up part of the ammonite superfamily

Stephanoceratoidea Stephanoceratoidea, formerly Stephanocerataceae, is a superfamily of middle- upper Jurassic ammonoid cephalopods within the order Ammonitida containing diverse forms, generally with sharp ribbing and complex suture lines. Aptychi are believed t ...

. ''Docidoceras'' has a broad, finely ribbed, evolute shell with a depressed whorl section. The venter, the outer rim, is broadly arched and crossed by the ribs without interruption. The dorsum, on the inner rim of the whorls is broadly impressed.

Distribution

Fossils of ''Docidoceras'' have been found in: * Laberge Group, Yukon, Canada * Agoudim Formation, Morocco * Andalusia, Spain *

Inferior Oolite The Inferior Oolite is a sequence of Jurassic age sedimentary rocks in Europe. It was deposited during the Middle Jurassic.Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, Europe)." In: Weishampel, David B.; Dodson, Pet ...

, United Kingdom * Kialagvik Formation, Alaska, United States

References

Bibliography

* Arkell ''et al.'', 1957; Ammonitina in the Treatise on Invertebrate Paleontology, Part L, Ammonoidea; Geological Soc of America and Univ Kansas press. Middle Jurassic ammonites Bajocian life Middle Jurassic ammonites of Europe Jurassic Spain Fossils of Spain Jurassic United Kingdom Fossils of England Ammonites of Africa Jurassic animals of Africa Middle Jurassic Africa Jurassic Morocco Fossils of Morocco Jurassic ammonites of North America Jurassic Canada Fossils of Canada Jurassic United States Fossils of the United States Ammonitida genera Stephanoceratoidea {{jurassic-animal-stub