Biology:Placenticeras

Placenticeras is a genus of ammonites from the Late Cretaceous. Its fossils have been found in Asia, Europe, North and South America.

Taxonomy

Placenticeras, named by Fielding Bradford Meek, 1870, is the type genus for the Placenticeratidae, a family that is part of the Hoplitoidea, a superfamily of the Ammonitida.

Species

The genus contains the following species:

• Placenticeras bidorsatum
• Placenticeras costatum
• Placenticeras cumminsi
• Placenticeras fritschi
• Placenticeras grossouvrei
• Placenticeras intercalare
• Placenticeras kolbajense
• Placenticeras maherndli
• Placenticeras mediasiaticum
• Placenticeras memoriaschloenbachi
• Placenticeras meeki
• Placenticeras orbignyanum
• Placenticeras paraplanum
• Placenticeras placenta
• Placenticeras polyopsis
• Placenticeras pseudoplacenta
• Placenticeras semiornatum
• Placenticeras syrtale (syn. Stantonoceras pseudocostatum)
• Placenticeras tamulicum
• Placenticeras vredenburgi
• Placenticeras whitfieldi
• 
  P. costatum, Pierre Shale Formation, South Dakota
• 
  P. placenta with mosasaur bite marks
• 
  P. meeki showing sutures
• 
  P. intercalare ammolite, Bearpaw Formation, Alberta, Canada
• 
  P. whitfieldi with mosasaur bite marks
• 
  Placenticeras sp. showing sutures. Pierre Shale, Upper Cretaceous; Meade County, South Dakota (USA)

References

• Arkell et al., 1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Soc. of America, Univ of Kansas Press. R.C. Moore, (Ed)
• W. A. Cobban and Hook, S. C. 1983 Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
• W. A. Cobban and Hook, S. C. 1979, Collignoniceras woollgari wooollgari (Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States. Memoir 37, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
• Discovering Fossils: How to Find and Identify Remains of the Prehistoric Past (Fossils & Dinosaurs) by Frank A. Garcia, Donald S. Miller, and Jasper Burns
• Placenticeras in the Paleobiology Database

Wikidata ☰ Q3906120 entry