小油櫛蟲學名Olenellus)是生存於寒武紀第二世第四期的一三葉蟲,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。牠們的部較小,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。[1]

Quick Facts 科學分類, 模式種 ...
小油櫛蟲屬
化石時期:522–510 Ma
寒武紀
Thumb
Olenellus thompsoni
科學分類 編輯
界: 動物界 Animalia
門: 節肢動物門 Arthropoda
(未分級) 類肢類 Artiopoda
綱: 三葉蟲綱 Trilobita
目: 萊得利基蟲目 Redlichiida
科: 小油櫛蟲科 Olenellidae
亞科: 小油櫛蟲亞科 Olenellinae
屬: 小油櫛蟲屬 Olenellus
Billings英語Elkanah Billings, 1861
模式種
Olenellus thompsoni
(Hall英語James Hall (paleontologist), 1859)

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物種

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

重新分配的物種

以下的物種現時已被置入其他屬。

  • Olenellus alabamensis = Fremontella halli
  • Olenellus altifrontatus = Bolbolenellus altifrontatus
  • Olenellus argentus[5] pl. 40, fig 12, 13, 15, 16, non fig. 14 = Grandinasus argentus
  • Olenellus argentus[5] pl. 40, fig 14, non fig. 12, 13, 15, 16 = Holmiella falx
  • Olenellus bondoni = Fallotaspis bondoni
  • Olenellus bonnensis = Mesonacis bonnensis
  • Olenellus brevoculus = Mesonacis bonnensis
  • Olenellus broegeri = Callavia broegeri
  • Olenellus bristolensis = Bristolia bristolensis
  • Olenellus bristolensis[6] 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[5] pl. 15, fig. 18 = Bristolia fragilis
  • Olenellus fremonti[5] pl. 37, fig. 1, 4-5 = Bolbolenellus euryparia
  • Olenellus fremonti[5] pl. 37, fig. 1-2 = Mesonacis fremonti
  • Olenellus georgiensis,[7] 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[8] = Elliptocephala walcotti
  • Olenellus truemani[9] = Fritzolenellus truemani
  • Olenellus truncatooculatus = Mummaspis truncatooculatus
  • Olenellus vermontanus = Mesonacis vermontanus
  • Olenellus walcottanus = Wanneria walcottana

圖片

參考文獻

外部連結

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