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雲南頭蟲

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雲南頭蟲
化石時期: 寒武紀早期

化石標本
科學分類
界: 動物界 Animalia
門: 節肢動物門 Arthropod
綱: 三葉蟲綱 Trilobita
目: 褶頰蟲目 Ptychopariida
亞目: 褶頰蟲亞目 Ptychopariina
總科: Ellipsocephaloidea
科: 雲南頭蟲科 Yunnanocephalidae
屬: 雲南頭蟲屬 Yunnanocephalus
Kobayashi, 1936
模式種
雲南雲南頭蟲
Yunnanocephalus yunnanensis

(Mansuy, 1912
  • Yunnanocephalus yunnanensis
    (Mansuy, 1912
  • Yunnanocephalus longioccipitalis
    Palmer & Rowell, 1995
  • Yunnanocephalus macromelos
    Paterson & Brock, 2007
異名
  • Pseudoptychoparia Ting, 1936

雲南頭蟲學名Yunnanocephalus),為三葉蟲的一屬,化石發現於中國澳洲南極等地(在中國澄江尤其常見)[1],體長約 2 至 4 公分。

特徵[编辑]

蟲體前端寬圓,後端狹窄;頭大,略呈橢圓形;頭鞍寬度向前逐漸變小,鞍前葉鈍圓狀;頭鞍溝有3對,但有時不明顯;頸環寬;眼脊粗,由鞍前葉向兩側延伸;固定頰寬,活動頰小而窄;頰角處圓弧狀,無頰刺。頭與胸節腹側均有雙支形附肢,但附肢結構不甚清楚。胸部位有14體節,肋溝淺而寬,除最後軸節外,均有側葉與粗短的邊緣側刺;大部份軸節上均有1個小刺瘤。尾部小,由2個不完全軸節所構成,中軸近四方形,側區小而近似三角形[2]

化石分布[编辑