湖南涟源发现的新类型的头足类口盖化石

A NEW TYPE OF OPERCULUM OF CEPHALOPODS FOUND IN LIANYUAN,HUNAN

涟源虎溪山发现的头足类口盖构造特殊,这种口盖由一块中板和两块侧板复合而成,代表一种新类型,命名为三分口盖。本文记录了化石的层位,分析了该化石层的沉积环境描述了口盖的形态并推断其为华南菊石的口盖。图2,参3。

Aperfect specimen of operculum has been found in Dalong Formation of Upper Permian in Lianyuan Huxingshan,Hunan. The operculum consists of one medial plate and two lateral plates and represents a new type named triapthychi.This paper indicates the fossil stratigraphic horizon and discusses the depositional environment,in which the operculum fossil was preserved.The shape of the operculum specimen is described and analysed in detail. It is inferred that this operculum is belong to a Hunanoceras. 2figs., 3refs.