The enigmatic medusoid Peytoia and a comparison of some Cambrian biotas
The enigmatic medusoid Peytoia and a comparison of some Cambrian biotas
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神秘的水母佩托亚和一些寒武纪生物群的比较
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
R. Robison
中科院分区：
文献类型：
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作者：
S. Morris;R. Robison
本文描述了美国犹他州中西部中寒武纪惠勒组的两种软体水母（Peytoia cf. P. nathorsti）标本。这扩大了Peytoia的地理和时间范围，迄今为止，Peytoia仅在不列颠哥伦比亚省南部中寒武纪早期的伯吉斯页岩中被记录。在犹他州北部中寒武纪早期的铅钟页岩中也发现了一种表面相似但不确定的水母状体。通过对不同地层中含硬体的属的总数和比例的比较表明，伯吉斯页岩包含的生物群可能代表了北美中寒武纪、低纬度、开放陆架环境。
Two specimens of a soft-bodied medusoid, Peytoia cf. P. nathorsti, are described from the Wheeler Formation of middle Middle Cambrian age in west-central Utah. This extends the observed geographical and temporal ranges of Peytoia, which hitherto has been recorded only from the Burgess Shale of early Middle Cambrian age in southern British Columbia. A superficially similar, but indeterminate, medusoid from the Lead Bell Shale of early Middle Cambrian age in northern Utah is also described. Comparison of total numbers and proportions of genera with hard parts from different formations suggests that the Burgess Shale contains a biota that is probably representative of Middle Cambrian, low-latitude, open-shelf environments in North America.