Gymnites
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, the Anisian age.
Species
Gymnites aghdarbandensis Krystyn and Tatzreiter 1991Gymnites asseretoi Tozer 1972Gymnites billingsi Bucher 1989Gymnites calli Smith 1914Gymnites compressus Tozer 1994Gymnites evolutus Shevyrev 1995Gymnites humboldti Mojsisovics 1882Gymnites incultus Beyrich 1867Gymnites machangpingensis Zhao and Wang 1974Gymnites perplanus Meek 1877Gymnites petilus Wang and Chen 1979Gymnites procerus Tozer 1994Gymnites robinsoni Shevyrev 1995Gymnites toulai Arthaber 1914Gymnites tozeri Bucher 1992Gymnites tregorum Silberling and Nichols 1982Gymnites vastesellatus Welter 1915Description
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 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 included Gymnites in the Gymnitidae along with Ophiceras, Flemingites, and Xenaspis, genera since assigned elsewhere, and included the Gymnitidae in the suborder Ceratitoidea. Smith shows Gymenites derived from Xenaspis and giving rise to the Pinacoceratidae.The American Treatise also includes Gymnites in the Gymnitidae, along with mainly descendant forms such as Buddhaites, Japonites, 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.