New hermit crabs (Paguroidea, Anomura) from the Eocene of Huesca, Spain

IF 0.5 4区地球科学 Q4 GEOLOGY

Boletin De La Sociedad Geologica Mexicana Pub Date : 2021-12-01 DOI:10.18268/bsgm2021v73n3a070121

F. Ferratges, P. Artal, S. Zamora

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引用次数: 1

Abstract

A new genus and two new species of fossil hermit crabs (Anomura, Paguroidea) are described from the southern Pyrenean basins (Huesca, NE Spain). Parapetrochirus nov. with P. robustus n. gen., n. sp., as type species, comes from the lower Eocene (Ypresian) Roda Formation. It preserves both chelipeds exhibiting a notable heterochely, a larger left cheliped and a concavity without granulation in the inner upper portions. Eocalcinus gerardbretoni n. sp. comes from the highest levels of the Arguis Formation (Priabonian) in Yeste locality. This species is characterized by a hemispherical outline and a sinuous lower margin of the chela, which differs from the type species of the genus. The cheliped morphology of such species allows inclusion in the families Diogenidae and Calcinidae, respectively. Fossil paguroids are relatively rare in the Eocene of Spain, therefore, the description of these two new taxa increases the known diversity of this group. Parapetrochirus robustus n. gen., n. sp. inhabited siliciclastic substrates within a prodelta environment and E. gerardbretoni n. sp. was collected from the last levels of coral rudstones just below the continental influence of Yeste-Arrés Formation.

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西班牙韦斯卡始新世寄居蟹新种(paguro总科，反常目)

描述了比利牛斯山脉南部盆地（西班牙东北部韦斯卡）的一个新属和两个新种的寄居蟹化石（Anomura，Paguroidea）。Parapetrochirus nov.与P.robustus n.gen.，n.sp.为模式种，产于始新世下统（伊普雷西阶）罗达组。它保留了两种螯肢，表现出显著的杂环性、较大的左螯肢和内上部没有肉芽的凹陷。始钙菌来源于Yeste地区Arguis组（Priabonian）的最高层。本种的特征是具有半球形轮廓和弯曲的螯下部边缘，这与本属的模式种不同。这类物种的螯足形态可以分别归入龙科和龙科。paguroids化石在西班牙始新世相对罕见，因此，对这两个新分类群的描述增加了该类群的已知多样性。粗壮副岩藻（Parapetrochirus robustus n.gen.，n.sp.）栖息在前三角洲环境中的硅质碎屑基质中，而杰拉德布雷托尼E.gerardbretoni n.sp.是从Yeste Arrés组大陆影响下的最后一层珊瑚砾状岩中采集的。

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来源期刊

Boletin De La Sociedad Geologica Mexicana GEOLOGY-

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

50 weeks

期刊介绍： The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers. We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.