| 词条 | Gravicalymene |
| 释义 |
| name = Gravicalymene | fossil_range = {{Geological range/linked|Middle Ordovician|Early Devonian}}[1] | status = EX | status_system = | image = Gravicalymene yamakoshii - National Museum of Nature and Science, Tokyo - DSC07017.JPG | image_caption = Gravicalymene yamakoshii | regnum = Animalia | phylum = Arthropoda | classis = †Trilobita | ordo = †Phacopida | subordo = †Calymenina | familia = †Calymenidae | genus = †Gravicalymene | subdivision_ranks = Species | subdivision = See text. }}{{Commonscat}} 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. SpeciesSome known species and locations include:
References1. ^{{cite web|title=†Gravicalymene Shirley 1936 (trilobite)|url=http://www.paleodb.org/cgi-bin/bridge.pl?a=basicTaxonInfo&taxon_no=21587|publisher=Paleobiology Database|accessdate=21 August 2011}} {{Trilobites}}{{Taxonbar|from=Q5597973}}{{phacopida-stub}}2. ^Ohio University 3. ^Trilobites of eastern North America 6 : Calymenidae|Silurian trilobites|Extinct animals of the United States|Ordovician first appearances|Devonian extinctions|Paleozoic life of Quebec |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。