小油櫛蟲（學名：）是生存於寒武紀第二世第四期的一屬三葉蟲，是目前發現最古老的三葉蟲品種之一。這類原始的三葉蟲生活在海底，不怎麼活躍。牠們的尾部較小，頭及眼大，並有眾多長有棘刺的胸節，其中一節特別顯眼。胸部呈錐狀、往後逐漸變小。頭甲周圍有一圈窄小的縫，與頰刺連成一體。外骨骼的護膜很薄。牠們沒有背部表面的骨縫——這是其他三葉蟲擁有的特徵。
物種
- Olenellus agellus Resser & Howell, 1938
- Olenellus clarki (Resser, 1928),
- Olenellus transitans (Walcott, 1910), pl. 40, fig 12, 13, 15, 16, non fig. 14 = Grandinasus argentus
- Olenellus argentus p. 8. fig 1-11, non pl. 7, fig 1, 2, 5 = Bristolia harringtoni
- Olenellus bufrontis = Bolbolenellus sphaerulosus
- Olenellus callavei = Callavonia callavei
- Olenellus cylindricus = Mesonacis cylindricus
- Olenellus eagerensis = Mesonacis eagerensis
- Olenellus euryparia = Bolbolenellus euryparia
- Olenellus forresti = Redlichia forresti
- Olenellus fremonti p. 220, pl. 5, fig. 7, non fig. 6 = Mesonacis vermontanus
- Olenellus gigas = Andalusiana cornuta
- Olenellus gilberti = Bristolia bristolensis
- Olenellus groenlandicus = Bolbolenellus groenlandicus
- Olenellus halli = Fremontella halli
- Olenellus hamoculus = Mesonacis hamoculus
- Olenellus hermani = Bolbolenellus hermani
- Olenellus hyperboreus = Mesolenellus hyperboreus
- Olenellus insolens = Bristolia insolens
- Olenellus intermedius = Fritzolenellus lapworthi or F. reticulatus
- Olenellus kentensis = Bolbolenellus groenlandicus
- Olenellus lapworthi = Fritzolenellus lapworthi
- Olenellus laxocules = Elliptocephala laxocules
- Olenellus logani = Elliptocephala logani
- Olenellus mickwitzi = Schmidtiellus mickwitzi mickwitzi
- Olenellus mohavensis = Bristolia mohavensis
- Olenellus multinodus = Nephrolenellus multinodus
- Olenellus paraocules = Elliptocephala paraocules
- Olenellus praenuntius = Elliptocephala praenuntius
- Olenellus reticulatus = Fritzolenellus reticulatus
- Olenellus sequomalus = Elliptocephala sequomalus
- Olenellus sphaerulosus = Bolbolenellus sphaerulosus
- Olenellus svalbardensis = Mesolenellus svalbardensis
- Olenellus terranovicus = Mesonacis bonnensis
- Olenellus torelli = Schmidtiellus mickwitzi torelli
- Olenellus truemani = Elliptocephala walcotti
- Olenellus truemani = Fritzolenellus truemani
- Olenellus truncatooculatus = Mummaspis truncatooculatus
- Olenellus vermontanus = Mesonacis vermontanus
- Olenellus walcottanus = Wanneria walcottana
圖片
Image:Olenellus NT small.jpg|Olenellus thompsoni的復原圖
Image:Olenellus fowleri CRF.jpeg|Olenellus fowleri
Image:Olenellus-fowleri.jpg|Olenellus fowleri
Image:Olenellus gilbert rightlight CRF.jpg|吉伯特氏小油櫛蟲（Olenellus gilberti）
Image:Olenellus yorkensis CRF.jpg|Olenellus roddyi
Image:Olenellus chiefensis cephalon CRF.jpg|Olenellus chiefensis
Image:Olenellus clarki 37mm CRF.jpeg|Olenellus clarki
Image:Olenellus nevadensis CRF.jpg|Olenellus nevadensis
Image:Olenellus terminatus Pyramid Shale Carrara Formation.jpg|Olenellus terminatus
參考文獻
外部連結
- [http://paleodb.org/cgi-bin/bridge.pl?action=basicTaxonInfo&taxon_no=19149 Olenellus] in the Paleobiology Database
- [http://www.fossilmuseum.net/Fossil_Galleries/TrilobitesNevada/Olenelluschiefensis/atrilobites26.htm photograph of Olenellus chiefensis]
- [https://web.archive.org/web/20120316021009/http://trilobites.lifedesks.org/pages/79 photograph of Olenellus getzi]
- [http://www.sciencephoto.com/media/132483/enlarge photograph of Olenellus gilberti]
- [http://www.westerntrilobites.com/trilobites/Olenellus-terminatus/Olenellus-terminatus.htm photograph of Olenellus terminatus]
- [https://archive.today/20130415103212/http://trilobites.lifedesks.org/pages/198 photograph of Olenellus thompsoni]
- [https://archive.today/20130415062616/http://trilobites.lifedesks.org/pages/199 photograph of Olenellus transitans]
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