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古脊椎动物学报 ›› 2007, Vol. 45 ›› Issue (1): 1-12.

• 古脊椎动物学报 •    下一篇

云南早泥盆世西山村组华南鱼类的首次发现

盖志琨 , 朱 敏   

  • 出版日期:2007-03-15 发布日期:2007-03-15

FIRST DISCOVERY OF HUANANASPIDAE FROM THE XISHANCUN FORMATION (LOCHKOVIAN, DEVONIAN) OF YUNNAN, CHINA

GAI Zhi-Kun, ZHU Min   

  • Published:2007-03-15 Online:2007-03-15

摘要: 记述了云南曲靖地区早泥盆世洛霍考夫期华南鱼类一新属——王冠鱼(Stephaspis gen. nov.)。新属发现于西山村组下部致密坚硬的石英砂岩中,其主要特征是:个体较大的华南鱼类,头甲呈长盾形,后缘向后凸出;角发育,侧向延伸,末端向头甲后侧方自然倾斜,内角不发育;具吻突,但不甚发育;中背孔较大,呈纵向椭圆形,前端稍尖,后端圆钝;眶孔较小,圆形,背位;头甲背面具一对背窗,呈狭长椭圆形,靠近头甲侧缘;感觉管系统不甚发育,仅见后眶上管、侧背管、侧横管及背联络管,后眶仁管呈V字形;纹饰为细小的粒状瘤点。新属不仅是华南鱼类在西山村组的首次发现,也指示了目前华南鱼类出现的最低层位,为探讨华南鱼类的起源与早期辐射提供了重要资料。

Abstract: A new genus of the family Huananaspidae(Galeaspida), Stephaspis is described in this paper. Fossil materials were recovered from the Xishancun Formation(early Lochkovian, Devo-nian) of Qujing, Yunnan Province, China. The new genus is not only the first discovery of the Huananaspidae in the Xishancun Formation but also represents the earliest occurrence of the Huananaspidae in the Devonian to date.