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首页> 外文期刊>Zootaxa >A new South American Miocene species of 'one-holed' sand dollar (Echinoidea: Clypeasteroida: Monophorasteridae)
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A new South American Miocene species of 'one-holed' sand dollar (Echinoidea: Clypeasteroida: Monophorasteridae)

机译：南美新中新种“单孔”沙钱（Echinoidea：Clypeasteroida：Monophorasteridae）

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摘要

A new species of monophorasterid sand dollar, Monophoraster telfordi n. sp., is described from the Early Miocene basal horizons of the Chenque Formation of Patagonia, Santa Cruz Province, in southern Argentina. The new taxon raises the number of known species in the family to six, and represents first unequivocal record of the genus for the Early Miocene of South America. It is therefore also the oldest member of the genus. M. telfordi is characterized by its test width to length ratio, which is much higher than for the other two described species in the genus, but less than that known for the extremely wide members of the sister taxon, Amplaster. M. telfordi is also unusual among monophorasterids in lacking broad continuity between basicoronal and post-basicoronal plates in the oral interambulacra. A key is provided to all the known species of Monophorasteridae.
机译：Monophorasterid沙钱的一种新物种Monophoraster telfordi n。从阿根廷南部圣克鲁斯省巴塔哥尼亚的Chenque组的中新世早期地层中描述了该物种。新的分类单元将家族中已知物种的数量增加到六个，代表了南美中新世早期属的明确记录。因此，它也是该属的最古老的成员。 telfordi的特征在于其测试的长宽比，该长宽比比该属中其他两个所述物种高得多，但比姊妹分类单元Amplaster的极宽成员所知道的要低。 telfordi菌在monophorasterids中也很不寻常，因为在口腔中的amalbulacra中，在基本孔板和basicoronal板之间缺乏广泛的连续性。为所有已知的独眼科物种提供了一个密钥。

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