Permoceras

Not to be confused with Permonautilus.

Permoceras
Temporal range:
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Family: †Permoceratidae
Genus: †Permoceras
Miller and Collinson, 1953
Species:
†P. bitauniensis[1]
Binomial name
†Permoceras bitauniensis[1]
(Haniel, 1915)

Permoceras is a fossil genus of coiled nautiloids that lived during the Kungurian.[2]

Discovery

Permoceras was first identified in the Lower Permian of Timur in the East Indies and named by Miller and Collinson in 1953.

Description

Permoceras has a smooth, compressed involute shell, whorls higher than wide, earlier whorls hidden from view. The venter is rounded as are the ventral and umbilical shoulders, the flanks flattened. The siphuncle is ventrally subcentral. The suture, which is most characteristic, has a deep, narrow pointed ventral lobe and large, asymmetrical pointed lobes on either side.

The coiling and whorl structure of Permoceras almost precisely resembles those of Pseudonautilus from the Upper Jurassic.

Taxonomy

Permoceras is the sister genus of Foveroceras, and the two are included in the family Permoceratidae, which is a member of the monotypic superfamily Permoceratoidea.[3][4]

See also

References

  1. ^ King, A. H. (1993). "MOLLUSCA: CEPHALOPODA (NAUTILOIDEA)". In Benton, M. J. (ed.). The Fossil Record 2 (PDF) (1st ed.). London ; New York: Chapman & Hall. ISBN 0-412-39380-8.
  2. ^ a b "Permoceratidae Miller & Collinson 1953 - Plazi TreatmentBank". Plazi TreatmentBank.
  3. ^ Permoceratidae in the Paleobiology Database
  4. ^ Permoceratoidea in the Paleobiology Database

Further reading


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