Olenus
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| Olenus micrurus from Trawsfynydd, N Wales, right free cheek displaced to left and turned 150°, pygidium missing
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| Scientific classification
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| Kingdom:
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Animalia
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| Phylum:
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Arthropoda
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| Clade:
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†Artiopoda
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| Class:
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†Trilobita
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| Order:
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†Ptychopariida
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| Family:
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†Olenidae
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| Genus:
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†Olenus
Dalman, 1827 non Dejean, 1835 nomen nudum, ex Thomson, 1857 (= Trycherus, a beetle)
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| Species
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- O. alpha Henningsmoen, 1957
- O. altaicus Ivshin, 1962
- O. apoxysomatus Jell et al., 1991
- O. asiaticus Kobayashi, 1944
- O. attenuatus (Boeck, 1838)
- O. austriacus Yang in Zhou et al., 1977
- O. cataractes Salter, 1864
- O. delicatus Öpik, 1963
- O. dentatus Westergård, 1922
- O. gibbosus (Wahlenberg, 1821) (type)
- O. guizhouensis Lu and Chien in Yin and Li, 1978
- O. haimantensis Reed, 1910
- O. henningsmoeni Ahlgren and Ahlberg, 1996
- O. micrurus Salter, 1849
- O. mundus Lake, 1908
- O. ogilviei Öpik, 1963
- O. proximus Lazarenko, 1966
- O. rotundatus Westergård, 1922
- O. scanicus Westergård, 1922
- O. sinensis Lu, 1964
- O. solitarius (Westergård, 1922)
- O. transverses Westergård, 1922
- O. truncatus (Brünnich, 1781)
- O. veles Rushton, 1983
- O. wahlenbergi Westergård, 1922
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Olenus is a genus of Upper Cambrian ptychopariid trilobite.