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Ostracodes of the Maple Mill Shale Formation (Upper Devonian) of southeastern Iowa, U.S.A.

机译:美国爱荷华州东南部Maple Mill页岩组(上泥盆统)的Ostracodes。

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摘要

The Upper Devonian Maple Mill Shale Formation in southeastern Iowa, U.S.A., has yielded a diverse and unusual ostracode fauna consisting of eighteen benthic species and one (probably planktonic) entomozoacean species. Only two species have ben previously described. Although the remaining species are considered new, because of poor preservation only three are named herein: Triceratina lethiersi n. sp., Graphiadactylloides kalonaensis n.sp. and Entomozoe (Nehdentomis?) kindlei n. sp. At the species level the fauna is unique. The absence of Bairdiacea suggests a low oxygen (hypoxic) environment. Conodonts indicate that the ostracode-bearing layer correlates with the Scaphignathus velifer Zone and fragments of cephalopods indicate the Platyclymenia do Ⅲ-Ⅳ Zone.
机译:美国爱荷华州东南部的上泥盆世枫树磨坊页岩组已经形成了一种由18种底栖动物和一种(可能是浮游性)昆虫动物组成的多样化且不同寻常的ostracode动物群。先前仅描述了两个物种。尽管其余物种被认为是新物种,但由于保存不良,在此仅命名为三种:Triceratina lethiersi n。 kalonaensis Graphiadactylloides n.sp.和昆虫(Nehdentomis?)kindlei n。 sp。在物种一级,动物区系是独特的。蝇B的缺乏表明低氧(低氧)环境。牙形石表明,含有Ostracode的层与Scaphignathus velifer区相关,头足类​​动物的碎片表明蝶the属Ⅲ-Ⅳ区。

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