HALYSESTHERIA YUI FROM THE NENJIANGIAN TAIPINGLINCHANG FORMATION OF HEILONGJIANG PROVINCE, CHINA

The specimens of Halysestheria yui (Chang) described in this peper are from the blackish grey shales of the basal Taipinglinchang Formation (Nenjiangian) at Yongan village of Jiayin County, Heilongjiang Province, China. Through the comparison between H. yui and H. qinggangensis, it is considered that the latter should be a junior synonym of the former. According to the SEM study of the species H. yui, it is noted that the growth bands near the umbo have regular reticulations between the long radial ridges, while the reticulation feature was overlooked by the observation under light microscope in the early literature. Thus, the description of the species H. yui is revised.

Project Supported:

Clc Number:

P534.53 F326.25