三分節蟲（學名：）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。
下属物种
本属包括以下物种：
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
圖片
Image:Triarthrus becki.jpg|Triarthrus eatoni的復原圖
Image:Triarthrus eatoni ventral cropped.jpg|Triarthrus eatoni
Image:Triarthrus spinosus slantlight CRF 01.jpg|Triarthrus spinosus
參考文獻
延伸閱讀
Thomas E. Whiteley, Gerald J. Kloc, and Carlton E. Brett Trilobites of New York*. Cornell University Press, 2002. 456 pages.
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