Preliminary study on Dictyonina Cooper,1942,from Kaili Formation(Cambrian Wuliuan)in Eastern Guizhou
A new species of Dictyonina balangia sp.nov.,collected from the Kaili Formation at Miaobanpo Sec-tion,Balang Village,Jianhe County,Guizhou Province is described here.The shell body is medium,and the outline is transversely oval to semicircular,biconvex;the hinge line is nearly straight;the cardinal extremity is obtuse angle;the ventral valve is strongly convex with prominent beak;the ventral valve is apsacline;the dorsal valve is moderate-ly convex;the shell decoration is complex and beautiful,and the shell surface is decorated with oblique radial and concentric lines;the two sets of lines cross,forming a fine grid of holes,and these holes grow in size at the edges.The discovery of Dictyonina balangia sp.nov.not only enriches the understanding of brachiopod community of Kaili Biota,but also provides new material for research on the ornamentation variations and morphology of Dictyonina shells.
万方数据
维普
