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寒武纪海洋中的双瓣壳节肢动物耙肢虾Occacaris Hou,1999曾被报导出现在云南澄江生物群和贵州凯里生物群中,延续了一个相对短的地质时间。本文报道了在贵州省剑河县辣子寨村杷榔组中上部发现的Occacaris。杷榔组的Occacaris以壳背缘和前腹边缘呈大角度相交为特征,不同于澄江生物群和凯里生物群发现的背缘和前腹边缘交角均小于90°角的O.oviformis Hou,1999和O.magnus(Yao,2009),应为一新种,命名为O.lazizhaiensis sp.nov.。O.lazizhaiensis sp.nov.在贵州杷榔组的发现表明起源于云南寒武纪早期扬子地台浅水区的Occacaris,在寒武纪早中期开始向贵州较深水区的杷榔组迁移,延续进入时代较晚的凯里组,为适应生态环境的改变,出现了体构上较大的差异。杷榔组Occacaris的发现增加了Occacaris分类学、生态学、古地理分布和演化发育的新信息。
Occacaris Hou, a bivalve arthropod shrimp in the Cambrian ocean, has been reported in the Chengjiang biota in Yunnan and the Kaili biota in Guizhou for a relatively short geologic time. This paper reports the Occacaris found in the upper part of the Balang group in the Spicy Zi Village in Jianhe County, Guizhou Province. Occacaris is characterized by a large angle of intersection between the dorsal margin of the shell and the anterior margin of the abdomen. Unlike the O.oviformis Hou found in the Chengjiang biome and the Kaili biota, the angle between the dorsal and anterior abdominal margins is less than 90 °, 1999 and O. magnus (Yao, 2009), should be a new species named O. lazizhaiensis sp.nov. O. lazizhaiensis sp.nov. The discovery of the Guizhou loam group indicates that Occacaris originating from the shallow terrain of the Yangtze platform in Early Cambrian, Yunnan, migrated to the loquat group in the deeper waters of Guizhou in the early and middle Cambrian age and continued The later Kaili Formation, in order to adapt to changes in the ecological environment, there have been structurally larger differences. The discovery of Occacaris in the group of Occacaris increased new information on taxonomy, ecology, palaeogeographical distribution and evolution of Occacaris.