Srinivasania Sundarbanensis gen. et sp. nov., a New Agglutinated Benthic Foraminifer from the World's Largest Mangrove Ecoregion, the Sundarbans, India
Tushar Kaushik, Anupam Ghosh, M. Thirumalai, I. Das
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引用次数: 1
Abstract
We describe Srinivasania sundarbanensis n. gen. et sp. nov., a multichambered textulariid foraminifer from the world's largest mangrove ecosystem, the Sundarbans, India. The new genus has an agglutinated wall structure, planispirally coiled test, and a single high-arched equatorial aperture located at the base of the final chamber with a narrow, agglutinated lip and with morphological similarity to the genera GobbettiaDhillon, 1968, and HaplophragmoidesCushman, 1910. Phylogenetic analyses, using partial small subunit rRNA gene, partial large subunit rRNA gene, and concatenated (LSU+SSU) sequence data clearly show the placement of this new taxon among other textulariid foraminifers, distant from all other genera in a strongly supported clade. In the new genus and species, the test is discoidal, measuring 100 to 350 µm in diameter with six to seven chambers in the final whorl. Elemental characterization (SEM-EDS) of the agglutinated test wall reveals a preference for quartz grains (SiO2) to construct its test. It is a common species and is presently known only from the northern marsh environments of Indian Sundarbans.
Srinivasania Sundarbanensis gen. et sp. nov.,一种来自世界上最大的红树林生态区——印度孙德尔本斯的新型底栖有孔虫
我们描述了Srinivasania sundarbanensis n. gen. et sp. nov.,一种来自世界上最大的红树林生态系统——印度孙德尔本斯的多室有孔虫。新属具有凝集的壁结构,平螺旋盘绕的测试,在最后腔室的基部有一个高拱形的赤道孔,具有狭窄的凝集唇,形态与GobbettiaDhillon(1968)和HaplophragmoidesCushman(1910)属相似。系统发育分析,使用部分小亚基rRNA基因,部分大亚基rRNA基因,和连接(LSU+SSU)序列数据清楚地表明,这个新分类单元的位置在其他纹理有孔虫中,远离所有其他属,在一个强烈支持的进化枝中。在新的属和种中,测试是盘状的,直径为100到350微米,在最后的轮中有6到7个腔室。元素表征(SEM-EDS)的凝集测试壁揭示了石英颗粒(SiO2)优先构建其测试。这是一种常见的物种,目前只在印度孙德尔本斯的北部沼泽环境中发现。
期刊介绍:
JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.