三分節蟲
三分節蟲(學名:Triarthrus)是生存於奧陶紀的一屬三葉蟲,生活在海床上。這類三葉蟲的外骨骼長度是其體寬的兩倍,頭甲很大而和尾甲很小,沒有頰刺,頭鞍上有兩對很深的溝。[1]
三分节虫属![]() 化石时期:
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Triarthrus eatoni | |
科学分类 ![]() | |
界: | 动物界 Animalia |
门: | 节肢动物门 Arthropoda |
(未分级): | †類肢類 Artiopoda |
纲: | †三叶虫纲 Trilobita |
目: | †褶頰蟲目 Ptychopariida |
科: | †油栉虫科 Olenidae |
亚科: | †三分节虫亚科 Triarthrinae |
属: | †三分节虫属 Triarthrus Green, 1832 |
模式種 | |
Triarthrus beckii Green, 1832
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種 | |
下属物种
本属包括以下物种:
- Triarthrus beckii Green, 1832, 異名 Paradoxides beckii, Calymene beckii
- Triarthrus billingsi Barrande, 1872
- 加拿大三分节虫 Triarthrus canadensis Smith, 1861
- Triarthrus eatoni (Hall, 1838), 異名 T. macastyensis
- Triarthrus glaber Billings, 1859
- Triarthrus huguesensis Förste, 1924
- Triarthrus latissimus Månsson, 1998
- Triarthrus linnarssoni Torslund, 1940
- Triarthrus rougensis Parks, 1921
- 四川三分节虫 Triarthrus sichuansis Lu & Chang, 1974
- Triarthrus spinosus Billings, 1857
重新分配的物種
以下的物種現時已被置入其他屬。
- Triarthrus angelini = Bienvillia angelini
- Triarthrus belli = Parabolinella sp.
- Triarthrus caenigenus = Porterfieldia caenigena
- Triarthrus convergens = Porterfieldia convergens
- Triarthrus fisheri = Porterfieldia fisheri
- Triarthrus goldwyerensis = Porterfieldia goldwyerensis
- Triarthrus humilis = Porterfieldia humilis
- Triarthrus jachalensis = Porterfieldia jachalensis
- Triarthrus pacificus = Porterfieldia pacifica
- Triarthrus papilosus = Porterfieldia papilosa
- Triarthrus parapunctatus = Porterfieldia parapunctata
- Triarthrus parchaensis = Bienvillia parchaensis
- Triarthrus punctatus = Porterfieldia punctata
- Triarthrus rectifrons = Bienvillia rectifrons
- Triarthrus reedi = Porterfieldia caenigena
- Triarthrus shinetonensis = Bienvillia shinetonensis
- Triarthrus sinensis = Porterfieldia sinensis
- Triarthrus tetragonalis = Bienvillia tetragonalis
- Triarthrus thor = Porterfieldia thor
- Triarthrus variscorum = Parabolina frequens[2]
圖片
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Triarthrus eatoni的復原圖
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Triarthrus eatoni
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Triarthrus spinosus
參考文獻
- ^ Walker, Cyril; Ward, David. Fossils. Smithsonian Handbooks revised, illustrated. Dorling Kindersley. 2002: 57. ISBN 0789489848.
- ^ Ludvigsen, R.; Tuffnell, P.A. A revision of the Ordovician olenid trilobite Triarthrus. Geological Magazine. 1983, 120 (6): 567–577. doi:10.1017/s0016756800027722.
延伸閱讀
- Thomas E. Whiteley, Gerald J. Kloc, and Carlton E. Brett Trilobites of New York. Cornell University Press, 2002. 456 pages. ISBN 978-0-8014-3969-8