Gravicalymene

Gravicalymene is a genus of trilobites from the order Phacopida, suborder Calymenia. Gravicalymene has been a 'hot button' trilobite lately. The species that are currently in this genus have been in Calymene and Sthenocalymene. One thing that seems to be consistent with the genus Gravicalymene is that they sometimes occur in Dolomitic limestone and that many occur in the Silurian age.

The most rare example of the genus is the Middle Ordovician species Gravicalymene magnotuberculata. This species is also amongst the rarest of all Calymenidae and is regionally confined to one or two exposures in New York State. G. magnotuberculata is noted for its extremely pustulose exoskeleton, bell shaped glabella and lack of complete articulated specimens.

Species

Some known species and locations include:

• Gravicalymene abbreviata (Foerste, 1910), southwestern Ohio, southeastern Indiana, and northern Kentucky.^[2]
• Gravicalymene arcuata, around Wales Great Britain.
• Gravicalymene hagani, North America
• Gravicalymene magnotuberculata, 2 localized bedding planes, New York State, United States.
• Gravicalymene truncatus, North America^[3]

References

v t e Trilobites Taxonomy Orders Agnostida Asaphida Corynexochida Harpetida Nektaspida Redlichiida Lichida Phacopida Proetida Ptychopariida Genera List of trilobites Geochronology Cambrian Ordovician Silurian Devonian Carboniferous Permian Notable fossils Acropyge Calymene Cheiropyge Eofallotaspis tioutensis Hupetina antiqua Isotelus Kathwaia Misszhouia Olenus Ogygiocarella debuchii Paraphillipsia Phacops rana Profallotaspis jakutensis Pseudophillipsia Serrania gordaensis Notable trilobitologists Alexander von Humboldt Joachim Barrande Alfred Russel Wallace Charles Doolittle Walcott Charles Emerson Beecher Roderick Murchison Adam Sedgwick Rudolf Kaufmann Rudolf Richter & Emma Richter Martin Basse Niles Eldredge George Frederic Matthew Harry B. Whittington Brian D. E. Chatterton Richard Fortey Euan Clarkson Franco Rasetti Gregory D. Edgecombe Bruce S. Lieberman Gerald J. Kloc Gerhard K. B. Alberti Teiichi Kobayashi Johan Wilhelm Dalman Paleobiology Cambrian explosion Cruziana Diplichnites Permian–Triassic extinction event Rusophycus Trilobite zone Notable fossil sites Anti-Atlas Mountains Beecher's Trilobite Bed Burgess Shale Emu Bay Shale Gees, Gerolstein Hunsrück Slate Jince Formation Latham Shale Llandeilo Group Maotianshan Shales Silica Shale Formation Walcott–Rust quarry Wenlock Group Wheeler Shale Wolchov River Wren's Nest Morphology Exoskeleton Tagmata Cephalon Thorax Pygidium Axial lobe Pleural lobe Terminology Cranidium Effacement Enrollment Facial sutures Fixigena Gena Genal angle Glabella Gonatoparian Heteronomous Homonomous Hypostome Isopygous Librigena Macropygous Micropygous Opisthoparian Proparian Prosopon Spinosity Subisopygous Soft body parts Appendages Digestive tract Internal organs Musculature Antennae Eyes Sensory pits Category:Trilobites