Gravicalymene
| Gravicalymene Temporal range: [1]
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| Gravicalymene yamakoshii Kobayashi & Hamada, 1977. From the Devonian of Japan. | |
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| Genus: | †Gravicalymene
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Gravicalymene Shirly, 1936, is a genus of trilobites from the order Phacopida, suborder Calymenia. Gravicalymene has been a 'hot button' trilobite lately.[clarification needed] 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 convolva Shirley 1936, found only at Birdshill Quarry, near Llandeilo, Wales (Ordovician of the United Kingdom).
- Gravicalymene arcuata Price, 1982. Rawtheyan Stage, Dolhir Beds, Cynwyd Forest, Denbighshire, North Wales, UK.[2]
- Gravicalymene capitovata Siveter, 1976[3] From the Middle Ordovician of the Oslo Region, Norway.
- Gravicalymene yamakoshii Kobayashi & Hamada, 1977.[4]
- Gravicalymene abbreviata (Foerste, 1910), southwestern Ohio, southeastern Indiana, and northern Kentucky.[5]
- Gravicalymene bakeri (Smith & Ebach, 2020), Tasmania[6][7]
- Gravicalymene hagani, North America
- Gravicalymene magnotuberculata, 2 localized bedding planes, New York State, United States.
- Gravicalymene truncatus, North America[8]
References
- ^ "†Gravicalymene Shirley 1936 (trilobite)". Paleobiology Database. Retrieved 21 August 2011.
- ^ Price, D. 1982. Calymene quadrata King, 1923 and allied species of trilobites from the Ashgill Series of North Wales. Geological Magazine, Volume 119 , Issue 1 , January 1982 , pp. 57 - 66. DOI: https://doi.org/10.1017/S0016756800025656
- ^ Siveter, D. J. 1976. The Middle Ordovician of the Oslo Region, Norway, 27. Trilobites of the Family Calymenidae. Norsk Geologisk Tidsskrift 56: 335-396.
- ^ Kobayashi & Hamada, 1977. Devonian trilobites of Japan in comparison with Asian, Pacific and other faunas. Palaeontological Society of Japan, Special Papers, no. 20, pp. i–vii + 1–202, pls. 1–13. (Reference No. 0551)
- ^ "Ohio University". Archived from the original on 2011-07-20. Retrieved 2011-01-06.
- ^ Enrico de Lazaro: Fossils of New Trilobite Species Found in Tasmania, on:sci-news, Sep 28, 2020
- ^ Patrick M. Smith, Malte C. Ebach: A new Ordovician (Katian) calymenid, Gravicalymene bakeri sp. nov., from the Gordon Group, Tasmania, Australia. In:: Alcheringa: An Australasian Journal of Palaeontology, published online September 16, 2020; doi:10.1080/03115518.2020.1797874
- ^ "Trilobites of eastern North America". Archived from the original on 2011-08-31. Retrieved 2011-01-06.
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