Modern planktonic foraminifera from the eastern Indian Ocean
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Modern planktonic foraminifera from the eastern Indian Ocean MUNIR Sonia1, 2, SUN Jun1, 2* 1 Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, Tianjin
300457, China 2 Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin 300457, China
Received 20 June 2017; accepted 6 April 2018 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2018
Abstract
A brief morphometric study of the recent planktonic foraminifera in the eastern Indian Ocean was provided with the taxonomic key to species, synonyms, SEM microphotographs of shells and chamber arrays. By recent classification, currently 20 species representing 13 genera and 6 families (Canderinidae, Heterohelicoidae, Hedbergellidae, Higerigerinoidae, Globigerinoidae, and Globorotaloidae) identified from the planktonic material of the eastern Indian Ocean up to a depth of 200 m. Their distribution in water (0–200 m) also reports on the new range of expansion in the eastern Indian Ocean, with Dentigloborotalia anfracta, Hastigerina pelagica, Streptochilus globigerus, Globigerinella calida, Globigerinella adamsi, Orcadia reidelii, Tenuitella parkerae, Tenuitella compressa, reported for the first time in this study area. In general, only around 50 planktonic species are valid worldwide, more specifically the species, e.g., H. pelagica, G. calida, G. adamsi, S. globigerus, O. riedeli, T. parkerae, T. compressa, which occur in the eastern Indian Ocean to fill the the paucity of the recent regional taxonomic literature and the problematic identification from the eastern Indian Ocean. This work aims to bridge this gap and help scientists, managers, educators and students to identify plankton foraminifers by using species notes and images. Key words: planktonic foraminiferida, Heterohelicoidae, Hedbergellidae and Higerigerinoidae, Globigerinoidae and Globorotaloidae, eastern Indian Ocean Citation: Munir Sonia, Sun Jun. 2018. Modern planktonic foraminifera from the eastern Indian Ocean. Acta Oceanologica Sinica, 37(10): 46–63, doi: 10.1007/s13131-018-1300-7
1 Introduction The distribution of planktonic foraminifera in the major oceans, Atlantic to Indo-Pacific Ocean, Indian Ocean and Arctic Ocean is described from the poles to the equator, shallow intertidal region to the deep sea. More than 50 planktonic foraminifera are the tropical, subtropical, temperate, sub-polar and polar species that have the highest richness in the northeast Atlantic Ocean (Bé and Tolderlund, 1971; Loeblich and Tappan, 1988; Hemleben et al., 1989; Bradshaw, 1959), and it is diverse in the Caribbean Sea and the Red Sea (Bijma and Hemleben, 1994; Schmuker, 2000). Mostly dead forams shells of planktonic species have been recovered from the globigerina ooze on the ocean floor. These thick blankets of forams shells have been used for the biostratigraphy, paleoenvironment studies, and isotope geochemistry of all ocean’s (Kucera et al., 2005; Aurahs et al., 2011) for example
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