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云南中三叠世豆齿龙类(爬行纲:楯齿龙目)一新属

2008年 第46卷 第3期:171~177

发表日期:2008-11-04李志恒来源:放大 缩小

:赵丽君  李  淳  刘  俊  何  涛

摘要:中国已知的楯齿龙目(Placodontia)化石仅见于贵州省西南部地区,其中豆齿龙亚目(Cyamodontoidea)产自关岭地区的法郎组瓦窑段,时代为晚三叠世卡尼期;楯齿龙亚目(Placodontoidea)产自盘县的关岭组II段,时代为中三叠世安尼期。本文记述的豆齿龙类新属种——康氏雕甲龟龙(Glyphoderma kangi gen. et sp. nov.)产于云南富源的法郎组竹杆坡段,属中三叠世拉丁期。
    正型标本保存于浙江自然博物馆(编号:M 8729),其头骨高度愈合,代表一个完全成年之个体,根据以下特征明显区别于我国的Psephochelys和欧洲的Psephoderma:1)头骨枕部具3枚大型的锥状鳞;2)背甲甲片结构更为复杂,具明显的放射状沟/脊结构。到目前为止,康氏雕甲龟龙是龟龙科(Placochelyidae)中惟一的中三叠世属种,该科的其他成员全部发现于上三叠统。

关键词:云南富源,拉丁期,法郎组竹杆坡段,楯齿龙

卷期:46卷 03期

  A NEW ARMORED PLACODONT FROM THE MIDDLE TRIASSIC OF YUNNAN PROVINCE, SOUTHWESTERN CHINA 

  ZHAO Li-Jun, LI Chun, LIU Jun, HE Tao 

   
Abstract  A new cyamodontoid placodont, Glyphoderma kangi gen. et sp. nov., is established on the basis of an articulated skeleton from the Middle Triassic Zhuganpo Member of the Falang Formation, Yunnan, southwestern China. It differs from the geologically younger Psephochelys polyosteoderma (early Late Triassic) in having a more complicated carapace osteoderm structure, and 3 enlarged tubercular osteoderms fused to the posterior surface of the skull. Glyphoderma is the only Ladinian member of the family Placochelyidae, all other placochelyids being Late Triassic. Placodonts, including both armored and non-armored forms are distributed from the Anisian to the Carnian in China.  
Key words  Fuyuan, Yunnan; Ladinian; Zhuganpo Member of Falang Formation; cyamodontoid placodont 

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