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小油栉虫

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小油栉虫属
化石时期:522–510 Ma
寒武纪
Olenellus thompsoni
科学分类 编辑
界: 动物界 Animalia
门: 节肢动物门 Arthropoda
(未分级) 类肢类 Artiopoda
纲: 三叶虫纲 Trilobita
目: 莱得利基虫目 Redlichiida
科: 小油栉虫科 Olenellidae
亚科: 小油栉虫亚科 Olenellinae
属: 小油栉虫属 Olenellus
Billings英语Elkanah Billings, 1861
模式种
Olenellus thompsoni
(Hall英语James Hall (paleontologist), 1859)

见内文

小油栉虫学名Olenellus)是生存于寒武纪第二世第四期的一三叶虫,是目前发现最古老的三叶虫品种之一。这类原始的三叶虫生活在海底,不怎么活跃。牠们的部较小,大,并有众多长有棘刺的胸节,其中一节特别显眼。胸部呈锥状、往后逐渐变小。头甲周围有一圈窄小的缝,与颊刺连成一体。外骨骼的护膜很薄。牠们没有背部表面的骨缝——这是其他三叶虫拥有的特征。[1]

物种

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  • Olenellus agellus Resser & Howell, 1938[2]
  • Olenellus chiefensis Palmer英语Allison R. Palmer, 1998[3]
  • Olenellus clarki (Resser, 1928),[2] 异名 Paedeumias clarki
  • Olenellus crassimarginatus Walcott, 1910,[2] 异名 O. thompsoni crassimarginatus, O. wanneri, O. latilimbatus
  • Olenellus fowleri Palmer, 1998[3]
  • Olenellus getzi Dunbar英语Carl Owen Dunbar, 1925,[2] 异名 O. alius, O. peculiaris
  • Olenellus howelli Meek英语Fielding Bradford Meek, 1874[3]
  • Olenellus nevadensis (Walcott, 1910),[2] 异名 Paedeumias nevadensis, Callavia nevadensis
  • Olenellus parvofrontatus Fritz, 1991[2]
  • Olenellus puertoblancoensis Lochman, 1952[2]
  • Olenellus robsonensis Burling, 1916,[2] 异名 Paedeumias robsonensis
  • Olenellus roddyi Resser & Howell, 1938,[2] 异名 O. similaris, O. nodosus, O. nitidus, O. jonasae, Paedeumias glabrum, P. yorkense, P. eboracense
  • Olenellus romensis Resser & Howell, 1938,[2] 异名 O. buttsi
  • Olenellus terminatus Palmer, 1998[3]
  • Olenellus thompsoni (Hall英语James Hall (paleontologist), 1859)[2][4]
  • Olenellus transitans (Walcott, 1910),[2] 异名 O. brachycephalus, Paedeumias perkinsi

重新分配的物种

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以下的物种现时已被置入其他属。

图片

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参考文献

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  1. ^ Walker, Cyril; Ward, David. Fossils. Smithsonian Handbooks revised, illustrated. Dorling Kindersley. 2002: 56. ISBN 0789489848. 
  2. ^ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Lieberman, B.S. Systematic Revision of the Olenelloidea (Trilobita, Cambrian) (PDF). Bulletin of the Peabody Museum of Natural History. 1999, 45 [2017-11-29]. (原始内容存档 (PDF)于2016-06-24). 
  3. ^ 3.0 3.1 3.2 3.3 Palmer, A.R. Terminal Early Cambrian Extinction of the Olenellina: Documentation from the Pioche Formation, Nevada. Journal of Paleontology. 1998, 72 (4): 650–672. JSTOR 1306693. 
  4. ^ Cowie, J.; McNamara, K.J. Olenellus (Trilobita) from the Lower Cambrian Strata of North-West Scotland (PDF). Palaeontology. 1978, 21 (3): 615–634 [2017-11-29]. (原始内容存档 (PDF)于2012-05-26). 
  5. ^ 5.0 5.1 5.2 5.3 5.4 Walcott, C.D., Olenellus and other genera of the Mesonacidae, Smithsonian Miscellaneous Collections, 1910, 63 (6): 231–422 
  6. ^ Riccio, J.F., The Lower Cambrian Olenellidae of the Marble Mountains, California, Bulletin of the Californian Academy of Sciences, 1952, 51: 25–49 
  7. ^ Resser, C.E.; Howell, B.F., Lower Cambrian Olenellus zone of the Appalachians, Bulletin of the Geological Society of America, 1938, 49: 195–248 
  8. ^ Fritz, W.H., Lower Cambrian Trilobites from the Sekwi Formation type section, Mackenzie Mountains, northwestern Canada, Bulletin of the Canadian Geological Survey, 1972, 212: 1–90 
  9. ^ Walcott, C.D., Cambrian geology and paleontology, No. 11, New Lower Cambrian subfauna, Smithsonian Miscellaneous Collections, 1913, 67 (11): 309–326 

外部链接

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