Skeletal Microstructures of the Chiton Ischnochiton hakodadensis and a Comparison with the Cambrian Halkieria


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发布日期2017-09-22
资源类型报告
全部作者ZHANG Xiaochuan and YAO Jinxian
机构团队北京大学自然保护与社会发展研究中心
关键字comparative anatomy, SSFs, Mollusca, polyplacophoran, sclerite microstructure, Halkieria
引用方式SkeletalMicrostructuresoftheChitonIschnochitonhakodadensisandaComparisonwiththeCambrianHalkieria[J]. 地质学报(英文版), 2014, 88(5):1378-1387.
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摘要

Halkieria is an Early Cambrian fossil genus with proposed phylogenetic affinities ranging from stem group lophotrochozoan to stem-group aculiferan.Skeletal similarities are often cited as evidence in support of a mollusk interpretation for Halkieria and related Cambrian fossils.The skeletal microstructures of the polyplacophoran mollusk(chiton) Ischnochiton hakodadensis,which bears perinotum elements resembling sclerites of halkieriids and other coeloscleritophoran small shelly fossils(SSFs),were studied to evaluate the interpretations.There are both similarities and differences between chiton skeletal structures and halkieriid sclerites:1) the head valve of /.hakodadensis and the dorsal shell of Halkieria evangelista share a similar pattern of fine concentric growth lines,but halkieriid dorsal shells lack other polyplacophoran valve characteristics,including V-shaped indentation,radiate ribs;2) the arrangement of I.hakodadensis perinotum elements in three zones is somewhat similar to the arrangement pattern of halkieriid sclerites;3) the inner perinotum scales of /.hakodadensis(~200 渭m in diameter) have a base and a blade,remarkably similar in morphology to halkieriid palmate sclerites(~400 渭m in diameter).However,/.hakodadensis perinotum scales are nearly solid whereas halkieriid sclerites are hollow.These observations add a microstructural dimension to the skeletal comparison between mollusks and halkeriids,and may prove to be useful in resolving the phylogenetic affinity of Halkieria and the Halwaxiidae.


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