Gephyrocapsa kennettii sp. nov., a new calcareous nannofossil species from the Middle Pleistocene, Solomon Sea, western equatorial Pacific

Chih Kai Chuang, Kuo Yen Wei, Horng Sheng Mii, Hui Ying Suk, Li Lo*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Detailed examinations of middle Pleistocene sediments of ODP Hole 1115B and Core MD05-2925 in the Solomon Sea, southwest equatorial Pacific, reveal a distinctive new form of the calcareous nannofossil group of gephyrocapsid which has peculiar elongate kite-shaped slits on the distal shields of the coccolith. A new species, Gephyrocapsa kennettii sp. nov., is proposed and described in this study with SEM (scanning electron microscope) images. The coccolith of this new species is elliptical in shape, bearing 2 to 19 kite-shaped slits on the distal shield and a low-angle, raised arch-like bridge. The distal shield has fewer slits than G. protohuxleyi which has slits in between all elements. The bridge is orientated clockwise with a ~10° angle to the long axis when viewed distally. The average length of the distal shield is 3.26 ± 0.22 (1s) mm (n = 36), and, by definition, this new species belongs to the small Gephyrocapsa group. The chronologic range of this species is short, spanning only from 0.520-0.465 Ma. Its last occurrence datum is almost coeval with that of Pseudoemiliania lacunosa at the bottom of Marine Isotope Stage 12. Morphologically, G. kennettii sp. nov. is intermediate between G. ericsonii and G. protohuxleyi and considered to be a transitional species originated by hybridization between them.

原文英語
頁(從 - 到)1-10
頁數10
期刊Micropaleontology
67
發行號1
出版狀態已發佈 - 2021 一月

ASJC Scopus subject areas

  • 古生物學

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