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三分节虫
来自维基百科，自由的百科全书
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三分节虫（学名：Triarthrus）是生存于奥陶纪的一属三叶虫，生活在海床上。这类三叶虫的外骨骼长度是其体宽的两倍，头甲很大而和尾甲很小，没有颊刺，头鞍上有两对很深的沟。[1]
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下属物种
本属包括以下物种：
- Triarthrus beckii Green, 1832, 异名 Paradoxides beckii, Calymene beckii
- Triarthrus billingsi Barrande, 1872
- 加拿大三分节虫 Triarthrus canadensis Smith, 1861
- Triarthrus eatoni (Hall, 1838), 异名 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
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以下的物种现时已被置入其他属。
- 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]
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图片
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Triarthrus eatoni的复原图 -
Triarthrus eatoni -
Triarthrus spinosus
参考文献
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