''Allocotoceras'' is an

endocerid Endocerida is an extinct nautiloid order, a group of cephalopods from the Lower Paleozoic with cone-like deposits in their siphuncle. Endocerida was a diverse group of cephalopods that lived from the Early Ordovician possibly to the Late Silurian ...

from the Lower Ordovician (upper Canadian) Karmberg Formation of Australia (

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

),''Allocotoceras''
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org included in the

Endoceratidae Endoceratidae is a family of large to very large straight shelled nautiloid cephalopods belonging to the order Endocerida that lived during the Middle and Late Ordovician. They include the largest known Paleozoic invertebrates, represented by '' ...

, based on small, straight or gently curved siphuncles. Septal necks, according to Teichert, 1964, are holochoanitic, reaching to the previous septum. Endocones are described as having a dorsal wedge, or process, making the internal opening, or endosiphocone, semicircular in cross section. In this sense ''Allocotoceras'' seems to resemble the genus ''

Najaceras ''Najaceras'' is a genus of straight, slender endocerid known only from the Whiterockian age Oil Creek Limestone of Oklahoma, introduced and named by Rousseau Flower in 1971 and further described by him in 1976. ''Najaceras'' is characterized ...

''.

References

External links

''Allocotoceras'' -Paleodb
{{Taxonbar, from=Q4733030 † Ordovician cephalopods of Oceania Ordovician Australia Darriwilian Fossils of Australia Paleontology in Tasmania Fossil taxa described in 1953

References

Further reading

External links