Didymoceras

Didymoceras is an extinct genus of ammonite cephalopod from the Late Cretaceous epoch (approximately 76 Ma). It is one of the most bizarrely shaped genera, with a shell that spirals upwards into a loose, hooked tip. It is thought to have drifted in the water vertically, moving up and down. The generic name is Latin for "paired horns".

Didymoceras
Temporal range: Upper Campanian
Artist's reconstruction of D. stevensoni, D. nebrascensis, and D. cheyennese
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
†Ammonoidea
Suborder:
†Ancyloceratina
Superfamily:
†Turrilitoidea
Family:
†Nostoceratidae?
Genus:
†Didymoceras

Hyatt, 1894
Species

See text

Synonyms
  • Cirroceras Conrad, 1866
  • Helicoceras d'Orbigny, 1842
  • Helicoceras Whitfield, 1877
  • Emperoceras Hyatt, 1894
  • Didymoceratoides Kennedy & Cobban, 1993

Its taxonomic place is often in flux, being placed in either Turrilitidae, Nostoceratidae, or its own family, Didymoceratidae. Species included in the genus are the following:[1]

  • Didymoceras angulatum (Meek and Hayden, 1860)
  • Didymoceras binodosum Kennedy and Cobban, 1993
  • Didymoceras californicum Anderson, 1958
  • Didymoceras cheyenense (Meek and Hayden, 1856)
  • Didymoceras cheyennense (Meek and Hayden, 1856)
  • Didymoceras cochleatus (Meek and Hayden, 1858)
  • Didymoceras hidakense Shigeta in Shigeta et al., 2016
  • Didymoceras hornbyense (Whiteaves, 1876)
  • Didymoceras navarroensis (Shumard, 1861)
  • Didymoceras nebrascense Meek and Hayden, 1856)
  • Didymoceras newtoni (Whitfield, 1877)
  • Didymoceras nicolletii (Hall and Meek, 1856)
  • Didymoceras platycostatum Kennedy and Cobban, 1993
  • Didymoceras stevensoni (Whitfield, 1877)
  • Didymoceras subtuberculatum Howarth, 1965
  • Didymoceras tenuicostatus (Meek and Hayden, 1858)
  • Didymoceras tortus (Meek and Hayden, 1858)
  • Didymoceras tricostatus (Whitfield, 1897)
  • Didymoceras umbilicatu (Meek and Hayden, 1858)
  • Didymoceras uncus (Meek and Hayden, 1858)
  • Didymoceras vespertinus (Conrad, 1874)

References
  1. "Didymoceras Hyatt 1900". Paleobiology Database. Retrieved February 21, 2012.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.