Ophiceras

Ophiceras
Temporal range: Induan
↓
Reconstruction of Ophiceras himalayanum
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
†Ammonoidea
Order:
†Ceratitida
Superfamily:
†Otoceratoidea
Family:
†Ophiceratidae
Genus:
†Ophiceras

Griesbach, 1880

Ophiceras is an extinct genus of smooth, evolute ceratitid ammonites from the Griesbachian (Early Triassic), with a rounded venter. Fossils of the genus have been found in Armenia, Azerbaijan, China, Greenland, and India.[1]

Diagnosis

The shell of Ophiceras evolute, whorls all showing, slowly increasing in height, and slightly embracing the previous. Umbilicus, wide and moderately deep. Surface ornamented with faint folds, which in some develop into coarse ribs in the mature growth stage, and transverse striae. Suture is ceratitic, lobes and saddles usually long and narrow.[2][3]

Taxonomy

Ophiceras is included in the Ophiceratidae according to the Treatise on Invertebrate Paleontology,[3] but was earlier placed in the Xenodiscidae.[2]

Five subgenera are recognized (in brackets): Ophiceras (Ophiceras), O. (Acanthophiceras), O. (Discophiceras), O. (Lytophiceras), O. (Metophiceras).

Ophiceras probably gave rise to Flemingites, which it somewhat resembles.

References

  1. ^ Ophiceras at Fossilworks.org
  2. ^ a b Smith, James P. (1932). "Lower Triassic Ammonoids of North America". US Geological Survey Professional Paper 167: 1−199. doi:10.3133/pp167.
  3. ^ a b Arkell, W. J.; Furnish, W. M.; Kummel, B.; Miller, A. K.; Moore, R. C.; Schindewolf, O. H.; Sylvester-Bradley, P. C.; Wright, C. W. (1957). "Part L—Mollusca 4, Cephalopoda, Ammonoidea". In R.C. Moore (ed.). Treatise on Invertebrate Paleontology. Geological Society and University of Kansas Press. ISBN 0-8137-3012-0.

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