. Collected reprints, Essa Institute for Oceanography. Oceanography Reprinted from JOURNAL OF PALEONTOLOGY Vol. kl, No. 6 The Society of Economic Paleontologists and Mineralogists 21 SOME SPUMELLARIAN RADIOLARIA FROM THE JAVA, PHILIPPINE, AND MARIANA TRENCHES HSIN-YI LING and WILLIAM A. ANIKOUCHINE University of Washington, Seattle Abstract—Eight species belonging to five genera of patagium-bearing and morphologically closely related spumellarian Radiolaria were found in three sediment cores from the Java, Philippine, and Mariana Trenches in the Indo-Pacific region. These various
. Collected reprints, Essa Institute for Oceanography. Oceanography Reprinted from JOURNAL OF PALEONTOLOGY Vol. kl, No. 6 The Society of Economic Paleontologists and Mineralogists 21 SOME SPUMELLARIAN RADIOLARIA FROM THE JAVA, PHILIPPINE, AND MARIANA TRENCHES HSIN-YI LING and WILLIAM A. ANIKOUCHINE University of Washington, Seattle Abstract—Eight species belonging to five genera of patagium-bearing and morphologically closely related spumellarian Radiolaria were found in three sediment cores from the Java, Philippine, and Mariana Trenches in the Indo-Pacific region. These various forms are illus- trated and discussed with special emphasis on their intraspecific variation in the degree of patagium development or preservation. INTRODUCTION IN 1964, while returning from the International Indian Ocean Expedition, the USC&GS Pioneer collected sediment cores from three trenches in the Indo-Pacific region (Text-fig. 1). The core locations are (names approved by the United States Board on Geographic Names): Java Trench, lat 6°00' S., long 101°17' E.; water depth, 3,380 m. Philippine Trench, lat 5°25' N., long 127°40' E.; water depth, 8,010 m. Mariana Trench, lat 11°18' N., long 141°57' E.; water depth, 10,170 m. During the preliminary examination of the core samples, the presence of uncommonly rich radiolarian faunas and abundant fragments of a diatom, Ethmodiscus rex (Rattray) Hendey, were noticed. Some Radiolaria in the assemblage possess highly diversified degrees of patagium. In a previous paper, Ling (1966) pointed out an inconsistent degree of patagium found in some spumellarian Radiolaria genera and discussed in detail its relationship to ontogenetic develop- ment and taxonomy. At that time, his observa- tion was based only on the radiolarian assem- blage in bottom sediments from the northeast Pacific Ocean. The finding of a similar feature in 20° 100° E 20°. 100° E Text-fig. /—Geographic locations of three trench cores from the Indo-P
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