摘要
安徽淮南八公山地区寒武纪毛庄-徐庄期地层出露良好,化石丰富。在老鹰山剖面徐庄组底部的紫色页岩内所采集大量三叶虫标本中发现的一种新的三叶虫,命名为Huaiaspishuainanensisgen.etsp.nov.,它代表了一个尚未描记的且科级分类位置待定的新属新种。该三叶虫特点突出,是头部特征极度消隐且不具眼、眼叶、眼脊的“盲三叶虫”。该三叶虫为小尾型后颊类,主要特征为:壳面光滑,背壳呈次椭圆形,头盖半圆形;头鞍呈钟形向前收缩;背沟浅,仅在侧光下可见;活动颊平滑宽大,具有宽阔的活动颊刺;胸部由14节组成;尾部中轴粗壮,无边缘沟。
A distinctive Cambrian trilobite collected from the lower part of Hsuchuang Formation at Laoyingshan, Caijiagang, near Huainan, northern Anhui Province is assigned as a new species belonging to a new genus classified under an undetermined family. The trilobite is named Huaiaspis huainanensis gen. et sp. nov. During Cambrian Period, the fossil locality lay on the southern margin of North China Platform. The material, on which the new taxon is based, includes 6 exoskeletons and more than 15 cranidia and pygidia, all preserved in reddish brown shale near the bottom of Hsuchuang Formation. The formation of the study area is probably of Hsu- chuangian age as used in North and Northeast China. The new form is a blind polymerid with cephalon and pygidium largely effaced, belonging to opisthoparian type. The new trilobite has a thorax bearing 14 segments and a small pygidium with a large axis that is poorly defined and not segmented. Its glabella is bell-shaped, defined obscurely by dorsal furrows that can be only observed under oblique light. Its fixigena is moderately wide, separated by well defined facial suture from a broad librigena that extends rearward into a large genal spine.
出处
《古生物学报》
CAS
CSCD
北大核心
2006年第4期540-548,共9页
Acta Palaeontologica Sinica
基金
国家自然科学基金(No.40272001)
国家重点基础研究发展规划项目(2006CB806400)
中国地质调查局中国震旦纪及显生宇年代地层划分及时限研究项目(No.1991300013011)资助课题
