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・ Triaxomera caucasiella
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Triarthrus
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Triarthrus : ウィキペディア英語版
Triarthrus

''Triarthrus'' is an Upper Ordovician trilobite found in New York, Ohio, Kentucky, and Indiana, eastern and northern Canada, China and Scandinavia. It is the last of the Olenid trilobites, a group which flourished in the Cambrian period. The specimens of ''T. eatoni'' that are found in the Beecher's Trilobite Bed, Rome, New York area are exquisitely preserved showing soft body parts in iron pyrite. Pyrite preservation has given scientists a rare opportunity to examine the gills, walking legs, antennae and digestive systems of trilobites, which are rarely preserved. ''Triarthrus'' is therefore commonly used in science texts to illustrate trilobite physiology.
== Distribution ==

* ''T. beckii'' Upper Caradoc and Ashgill, Snake Hill Formation, Cohoes, New York State; and Kentucky.
* ''T. billingsi'' Ashgill?, Quebec
* ''T. canadensis'' is known from the Upper Ordovician of Canada (Katian, lower Member of the Whitby Formation, Craigleith vicinity, Georgian Bay area; middle Member of the Whitby Formation, Whitby, Rogue River and Pickering, all Lake Simcoe area, Ontario)〔 ''cited in'' (【引用サイトリンク】author= Paleobiology Database )
* ''T. eatoni'' Upper Caradoc-Ashgill, N.Y., is known from the Upper Ordovician of Canada (Ashgill, lower Member of the Whitby Formation, Craigleith vicinity, Georgian Bay area, Lake Simcoe area, Ontario;〔 and Quebec) and the United States (New York)
* ''T. glaber'' Ashgill, Quebec
* ''T. huguesensis'' Ashgill, Quebec
* ''T. latissimus'' Sweden
* ''T. linnarssoni'' Norway and Sweden
* ''T. rougensis'' Ashgill, Ontario
* ''T. sichuansis'' China
* ''T. spinosus'' is known from the Upper Ordovician of Canada (Katian, middle Member of the Whitby Formation, Rogue River and Pickering, both Lake Simcoe area, Ontario〔 and Quebec), and the United States (New York).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Triarthrus」の詳細全文を読む



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