STUDY ON HALKIERIA FROM THE CAMBRIAN GEZHONGWU FORMATION IN GUIZHOU PROVINCE
Halkieria is a bilaterally symmetrical metazoan from the Cambrian,with large shell plates on both anterior and posterior parts of the body.It possesses a diverse array of calcareous sclerites and forms several regular longitudinal bands on the dorsal surface.Halkieria is commonly preserved as isolated sclerites in Cambrian deposits worldwide.However,its phylogenetic affinity has long been indetermined and controversial.In this paper,one genus and two species of Halkieria(Halkieria uncostatus,H.elongus)were identified based on morphological characters on sclerites.The microstructure of fiber bundle,imbricate-plating ornamentations,tubercles and holes arranged in parallel to the longitudinal ridges on the surface of the sclerites were observed.Cluster analysis and principal coordinate analysis show that Halkieria shares high similarities in the sclerite morphology with tommotiids rather than that with wiwaxiids,indicating the phylogenetic affinity of Halkieria is more close to tommotiids.
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