CHANCELLORIID SCLERITES WITH THE WELL-PRESERVED MICROSTRUCTURES FROM THE CAMBRIAN TERRENEUVIAN TIANZHUSHAN MEMBER AT THE SONGLINPO SECTION OF THE THREE GORGES AREA
Abundant chancelloriid sclerites were collected from the Cambrian Terreneuvian Tianzhushan Member at the Songlinpo section of Yichang,Hubei Province.They are classified into 2 genera,3 species and an indeterminated species,including Chancelloria cf.eros,Ch.irregularis,Chancelloria sp.,and Cambrothyra ampulliformis.Well-preserved pits microstructure can be observed on the basal facet of some sclerites,which is concentrically and regularly distributed around the foramen of each sclerite ray.The pits microstructure is morphologically similar to the muscle attachment structure on the hyolith operculum.Therefore,such microstructure is probably related to the attachment sites of the primary epithelial muscle cells of the epidermis and may make a steady connection between the sclerites and the soft body wall of chancelloriids,which further indicates that chancelloriids are the basal epitheliozoans rather than the sponge or sponge-grade metazoans.
chancelloriidsattachment structuresTianzhushan MemberTerreneuvianThree Gorges area
NETL
NSTL
万方数据
