Gymnites

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This article is about a genus of cephalopods. For the form of antigorite, see Gymnite.

Gymnites
Temporal range: Triassic, 247.2–235.0 Ma [1]
Gymnitidae - Gymnites incultus-001.JPG
Gymnites incultus from Bosnia, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Superfamily:
Ceratitaceae
Family:
Gymnitidae
Genus:
Gymnites

Mojsisovics, 1882

Gymnites is a genus of ammonoid cephalopod from the Middle Triassic belonging to the ceratitid family Gymnitidae. These nektonic carnivores lived during the Triassic period, Anisian age.[2]

Species[]

[1]

  • Gymnites aghdarbandensis Krystyn and Tatzreiter 1991
  • Gymnites asseretoi Tozer 1972
  • Gymnites billingsi Bucher 1989
  • Gymnites calli Smith 1914
  • Gymnites compressus Tozer 1994
  • Gymnites evolutus Shevyrev 1995
  • Gymnites humboldti Mojsisovics 1882
  • Gymnites incultus Beyrich 1867
  • Gymnites machangpingensis Zhao and Wang 1974
  • Gymnites perplanus Meek 1877
  • Gymnites petilus Wang and Chen 1979
  • Gymnites procerus Tozer 1994
  • Gymnites robinsoni Shevyrev 1995
  • Gymnites toulai Arthaber 1914
  • Gymnites tozeri Bucher 1992
  • Gymnites tregorum Silberling and Nichols 1982
  • Gymnites vastesellatus Welter 1915

Description[]

The shell of Gymnites is evolute, generally smooth, with a wide umbilicus. Whorls are moderately embracing, whorl section oval and somewhat compressed. The outer whorl may be costate or have rows of nodes, or both. The suture is ammonitic with a wide bifurcated ventral lobe and two lateral lobes on either side.

Taxonomic relation[]

Hyatt and Smith (1905, p. 115)included Gymnites in the Gymnitidae along with Ophiceras, Flemingites, and , genera since assigned elsewhere, and included the Gymnitidae in the suborder Ceratitoidea (now the superfamily Ceratitaceae). Smith (1932, p. 30) shows Gymenites derived from Xenaspis and giving rise to the .

The American Treatise (Part L, 1957) also includes Gymnites in the Gymnitidae, along with mainly descendant forms such as , , and variations on Gymnites itself, but instead included the Gymnitidae in the Pinacocerataceae which is consistent with Smith's derivation of the Pinacoceratidae from Gymnites.

Distribution[]

Fossils of species within this genus have been found in the Triassic of Afghanistan, Canada, China, Hungary, Iran, Russia, Switzerland, Turkey, United States.[1]

References[]

  1. ^ a b c The Paleobiology Database
  2. ^ Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  • Alpheus Hyatt and James Perrin Smith, 1905. The Triassic Cephalopod General of America. United States Geological Survey Professional Paper no. 40.
  • James Perrin Smith, 1932. Lower Triassic Ammonoids of North America. U.S. Geological Survey PP 167.
  • Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geol Soc. of America and Univ. Kansas Press, 1957. p. L184.
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