PLANKTONIC OSTRACODS (MYODOCOPA, HALOCYPRIDIDAE) FROM SIX ELTANIN CRUISES IN SOUTH PACIFIC AND ANTARCTIC WATERS

Abstract

ABSTRACT In this posthumous paper, the third in a series of reports on pelagic ostracods collected in southern-hemisphere and waters by RV Eltanin, and provided by the Smithsonian Oceanographic Sorting Center, depth and station records are reported for Gigantocypris sp., Macrocypridina poulseni, and 76 halocypridid species and subspecies. Records are based on examination of 473 samples from 182 stations between 33° and 70°S in the Pacific sector of the Southern Ocean; South Atlantic and Indian Ocean sectors were covered in previous reports. No new taxa were recognized in this study. Of the 76 halocypridids, 17 were not seen in Eltanin samples from other sectors, but most (perhaps all) of these are widespread and occur in northcrn-hemisphere waters. Six species, including Archiconchoecia bidens Deevey, 1982, and Conchoecia eltaninae Deevey, 1982, listed in previous Eltanin reports but not in this one, bring the far-southern halocypridid species list to 82. Fewer than half of these (at least 24 and perhaps 37) are known south of the Convergence. Of the list of 24, because many Antarctic ostracods live at great depths in other oceans, probably none are exclusively in distribution, though A. bidens is not yet known beyond its type locality at 71°56'S.