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地质学报  2005 

下奥陶统反称笔石属(Anisograptus)的形态分异与分类

, PP. 721-729

Keywords: 形态分异分类特马道克期安徽原始枝长度分支密度胞管密度

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Abstract:

根据安徽省宁国县胡乐地区的反称笔石属(Anisograptus)标本,参照国内外Anisograptus的25种及亚种的资料,发现反称笔石类的形态变化具有原始枝末端分支推迟和笔石枝密度缩减的特点,其中,部分种及亚种的胞管密度较大,与其他种类区别明显。因此,笔者等选择原始枝长度、分支密度、胞管密度为分类依据,将Anisograptus划分为如下5个种类:A.matanensisRuedemann,A.ruedemanniBulman,A.tetragraptoidesBulman,A.compactusCooper和A.delicatulusCooper。

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