Title: DUYUNASPIS ZHANG AND QIAN IN ZHOU ET AL.,1977(TRILOBITA) FROM THE BALANG FORMATION(CAMBRIAN,QIANDONGIAN) IN NORTHWESTERN HUNAN PROVINCE AND ITS INTRASPECIFIC VARIATIONS
Abstract:Duyunaspis duyunensis Zhang and Qian in Zhou et al.,1977 and D.paiwuensis sp.nov.are described herein based on the specimens recently collected from the Balang Formation(Cambrian,Qiandongian)at Zila V...Duyunaspis duyunensis Zhang and Qian in Zhou et al.,1977 and D.paiwuensis sp.nov.are described herein based on the specimens recently collected from the Balang Formation(Cambrian,Qiandongian)at Zila Village,Paiwu,Huayuan,NW Hunan.The abundant material,through all ontogenetic stages of the type species Duyunaspis duyunensis,shows wide intraspecific variation for the species in the glabellar shape,the connecting states of the pitted glabellar furrows,the number of thoracic segments and either absence or presence of an anterior indentation on the pygidial end etc.Four species referred previously to Duyunaspis but based on the intraspecific variations are regarded as junior synoniums of D.duyunensis.They are Duyunaspis songtaoensis Qian and Lin in Zhou et al.,1977,D.guzhangensis Zhou in Zhou et al.,1977,D.briaris Chien and Lin in Yin and Li,1978,and D.laevigatus Qian and Lin in Zhang etal.,1980,of which D.briaris is the objective senior synonym of Duyunaspis obesis Qian and Lin in Zhang et al.,1980.The study of intraspecific variation could ensure more correct identification on different species and is very important to the relevant study.Read More
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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