多股蟲（學名：Pliomera）是生存在奧陶紀海洋中的一屬三葉蟲。牠們的胸部分為12~18節，尾部則分為4-5節，且其尾部肋區（Pleura）並未密合，因此學者推測當牠們身體捲曲成防衛型態時，海水仍可順利由其尾部的縫隙流入下腹，使牠們能以防禦之姿順利呼吸。[3]其化石分佈於阿根廷、中國、俄羅斯和挪威等地。[1]
物種
- Pliomera anderkensis Weber, 1948
- Pliomera brevicapitata (Lamansky, 1903)
- 費氏多股蟲 Pliomera fischeri (Eichwald, 1825) 異名 Asaphus fischeri, Calymene polytoma, C. frontiloba
- P. fischeri fischeri
- P. fischeri asiatica Chugaeva, 1964
- Pliomera iliensis Koroleva, 1959
- Pliomera ingsanigensis Reed, 1906
- Pliomera mathesii Angelin, 1854
- Pliomera pseudoarticulata Reed, 1910
- Pliomera tmetophrys Harrington & Leanza, 1957
以下的物種現時已被置入其他屬。
- P. insangensis = Encrinurella insangensis
- P. insolita = Kanoshia insolita
- P. linnarssoni = Pliomerops linnarssoni
- P. martelli = Pliomerina martelli
- P. sulcifrons = Pliomerina sulcifrons
參考文獻
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