Shell and associated operculum in Teiichispira (Macluritidae: Gastropoda) from the Early/Middle Ordovician of the Argentine Precordillera

IF 1.3 4区地球科学 Q3 PALEONTOLOGY

Journal of Paleontology Pub Date : 2023-05-01 DOI:10.1017/jpa.2023.7

V. Bertero, Mariel Ferrari, Marcelo G. Carrera

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引用次数: 0

Abstract

Abstract. Two species of Teiichispira Yochelson and Jones reported from the Early/Middle Ordovician marine deposits of the San Juan Formation in the Argentine Precordillera are described. The new species Teiichispira teresae n. sp. is a component of the Early/Middle Ordovician marine gastropod assemblage in the studied region; Teiichispira argentina (Kayser), previously known from the San Juan Formation, is described with a complete teleoconch and associated operculum. The opercula of both Teiichispira species are complete and preserved in life position associated with the shell of T. argentina. The unguiculate morphology of the operculum is here interpreted as a mechanism for increasing the shell weight and ensuring anchoring to the substrate in a more or less fixed mode of life for Teiichispira, and as protection. The new occurrence of Teiichispira provides new taxonomic data on early Paleozoic marine gastropods in Argentina and testifies to a wide paleobiogeographical distribution for the genus, restricted to tropical and subtropical regions during the Early/Middle Ordovician.

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阿根廷Precordillera早/中奥陶世teiichipira (maclurtidae:腹足目)的壳和伴生盖

摘要介绍了阿根廷Precordillera地区早、中奥陶世San Juan组海相沉积中发现的Teiichispira Yochelson和Jones两种。Teiichispira teresae n. sp.是研究区早/中奥陶世海相腹足类组合的组成部分;阿根廷Teiichispira (Kayser)，以前已知来自圣胡安组，描述了一个完整的远程螺壳和相关的盖层。这两种Teiichispira的盖都是完整的，并保存在与阿根廷T.壳相关的生活位置。蝶盖的有蹄类形态在这里被解释为一种增加壳重的机制，并确保在一个或多或少固定的生活模式中锚定在基质上，并作为保护。Teiichispira的新发现为阿根廷早古生代海洋腹足类提供了新的分类资料，证明了该属在早/中奥陶世的热带和亚热带地区具有广泛的古地理分布。

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来源期刊

Journal of Paleontology 地学-古生物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Paleontology publishes original articles and notes on the systematics, phylogeny, paleoecology, paleogeography, and evolution of fossil organisms. It emphasizes specimen-based research and features high quality illustrations. All taxonomic groups are treated, including invertebrates, microfossils, plants, vertebrates, and ichnofossils.