Gravicalymene

Gravicalymene Temporal range: Ordovician to Devonian PreЄ Є O S D C P T J K Pg N [1]
Gravicalymene yamakoshii
Conservation status
Extinct
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Phacopida
Suborder:	†Calymenina
Family:	†Calymenidae
Genus:	†Gravicalymene
Species
See text.

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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

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