Taphonomic features of Haplophrentis carinatus from the Cambrian Kaili Formation, Jianhe, Guizhou and its symbiotic?relationship with eocrinids
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Abstract:
The Cambrian Kaili Formation in Jianhe, Guizhou province yielded abundant hyolitha fossils, among which Haplophrentis carinatus accounted for the largest proportion and was the most well-preserved. Previous researches on Haplophrentis carinatus were merely limited to taxonomy, lacking further discussion on the taphonomic features of Haplophrentis carinatus and its symbiotic relationship with other organisms. Herein, we conducted a systematic research on 324 specimens of Haplophrentis carinatus. Four taphonomic modes of opercula were recognized: separately preserved opercula, internal or external molds of opercula, partially and completely?articulated opercula. Few helens were preserved and conchs were mainly preserved as internal molds. In addition, a trident-like structure occurring on internal molds or fossil impressions, which resembles soft-tissue preservation, was taphonomic artifacts. The symbiotic relationship between Haplophrentis carinatus and eocrinids was also discussed and treated as an amensalism.
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Project Supported:
National natural science foundation of China (49060010,49462010), national climbing special project (95-expert-01-1-6), science and technology foundation of guizhou province, national 973 project (2006CB806401)
