Hyperlioceras

<i>Hyperlioceras</i>

Hyperlioceras

Genus of molluscs (fossil)

Quick Facts Scientific classification, Species ...

Hyperlioceras is an extinct genus of cephalopod included in the ammonitid family Graphoceratidae that lived during the Bajocian stage of the Middle Jurassic. The type species is Hyperlioceras discites (Waagen, 18567)

Morphology

The shell of Hyperlioceras is very compressed and involute, with a tall persistent keel and a deep umbilicus.

Biostratigraphic significance

The International Commission on Stratigraphy (ICS) has defined the base of the Bajocian Stage of the Jurassic as the lowest occurrence of the genus Hyperlioceras, at 170.3 ± 1.4 million years ago, which defines base of the Hyperlioceras discites Zone. This point also marks the end of the preceding Aalenian Stage. The upper boundary of the Bajocian is indicated by the lowest occurrence of the ammonite Parkinsonia (G.) convergens, at about 167.7 Ma, which defines base of Zigzagiceras zigzag Zone.

Distribution

Luxembourg, Saudi Arabia, Spain and the United Kingdom.[2]

Synonyms

Source:[2]

  • Braunsella Buckman, 1904
  • Braunsina Buckman, 1902
  • Darellia
  • Darellina Buckman, 1904
  • Deltoidoceras Buckman, 1902
  • Deltotoceras Buckman, 1904
  • Dissoroceras Buckman, 1902
  • Hugia Buckman, 1904
  • Hyperlioceras (Toxolioceras)
  • Lopadoceras Buckman, 1904
  • Reynesella
  • Reynesia Buckman, 1902
  • Toxolioceras

References

  1. [1]
    Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2017-10-16.
  2. [2]
    Paleobiology Database - Hyperlioceras. 2017-10-16.
  • W. Arkell et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. p. L264


Stub icon

This Ammonitina-related article is a stub. You can help Wikipedia by expanding it.

This article related to a Jurassic animal is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article Hyperlioceras, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.