三分節蟲

{{Automatic Taxobox
| taxon = Triarthrus
| authority = Green, 1832
| fossil_range = 
| image = Triarthrus eatoni bottom light CRF 01.jpg
| image_caption = Triarthrus eatoni
| type_species = Triarthrus beckii| type_species_authority = Green, 1832
| subdivision_ranks = 種
| subdivision = 見內文
}}三分節蟲'（學名：）是生存於奧陶紀海洋中的一屬三葉蟲，生活在海床上。這類三葉蟲的外骨骼長度是其體寬的兩倍。牠們具有很大的頭甲和很小的尾甲。頰部沒有棘刺，眉間可見兩對很深的溝。

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 

 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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