Cold-seep ostracods from the western Svalbard margin: direct palaeo-indicator for methane seepage?

IF 4.1 3区地球科学 Q1 PALEONTOLOGY

Journal of Micropalaeontology Pub Date : 2018-01-05 DOI:10.5194/JM-37-139-2018

M. Yasuhara, Kamila Sztybor, T. L. Rasmussen, Hisayo Okahashi, Runa Sato, H. Tanaka

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引用次数: 7

Abstract

Abstract. Despite their high abundance and diversity, microfossil taxa adapted to a particular chemosynthetic environment have rarely been studied and are therefore poorly known. Here we report on an ostracod species, Rosaliella svalbardensis gen. et sp. nov., from a cold methane seep site at the western Svalbard margin, Fram Strait. The new species shows a distinct morphology, different from other eucytherurine ostracod genera. It has a marked similarity to Xylocythere, an ostracod genus known from chemosynthetic environments of wood falls and hydrothermal vents. Rosaliella svalbardensis is probably an endemic species or genus linked to methane seeps. We speculate that the surface ornamentation of pore clusters, secondary reticulation, and pit clusters may be related to ectosymbiosis with chemoautotrophic bacteria. This new discovery of specialized microfossil taxa is important because they can be used as an indicator species for past and present seep environments ( http://zoobank.org/urn:lsid:zoobank.org:pub:6075FF30-29D5-4DAB-9141-AE722CD3A69B ).

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斯瓦尔巴群岛西部边缘的冷渗介形类:甲烷渗漏的直接古指示物?

摘要尽管它们的丰度和多样性很高，但适应特定化学合成环境的微体化石类群很少被研究，因此鲜为人知。在这里，我们报道了一种介形虫，Rosaliella svalbardensis gen.et sp.nov.，来自斯瓦尔巴群岛西部边缘Fram海峡的一个寒冷的甲烷渗漏点。该新物种表现出独特的形态，不同于其他Eucythrurine介形虫属。它与木细胞介有着显著的相似性，木细胞介是一种介形虫属，以木瀑布和热液喷口的化学合成环境而闻名。svalbardensis玫瑰可能是一个与甲烷渗漏有关的特有物种或属。我们推测，孔簇、次生网状和凹坑簇的表面纹饰可能与化学自养细菌的外共生有关。这一特殊微体化石分类群的新发现很重要，因为它们可以作为过去和现在渗漏环境的指示物种（http://zoobank.org/urn:lsid:zoobank.org:pub:6075FF30-29D5-4DAB-9141-AE722CD3A69B）。

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来源期刊

Journal of Micropalaeontology 生物-古生物学

CiteScore

4.30

自引率

5.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.