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Annelid metatrochophore Annelid nectochaete larva Annelid trochophore April Surface/Benthic Asteroid gastrula August Surface/Benthic bilge pump Biol bipinnaria Bivalve veliger Borge Bay Boxwood Press British Antarctic Survey Crustacean December Surface/Benthic December to January Deeper water 28 Echinoderms February Surface/Benthic Filtration efficiency flowmeter Gastropod veliger gastrula Hard and soft Hard substrata Fig Hard substratum Comments Holothurian J.S. Pearse January Surface/Benthic July Surface/Benthic larvae Lophophorates Mainly benthic Mainly surface March Surface/Benthic mean mm(n N/A Occurrence N/A Only seen Nemertean Pilidium November Surface/Benthic occasion Seasonality Occasionally seen October Surface/Benthic Ostracod Pearse and V.B. pelagic pelagic larvae plankton Planula Rarely caught Seasonality Rarely seen Seasonality Regular in season Regularly caught Reproduction of marine round Peak sea ice season Seasonality seawater seen in season September Surface/Benthic Signy Island Sipunculid soft sediment soft substrata Comments soft substrata Fig South Orkney Islands substratum Surface and benthic Taxonomy Thorson Tunicate tadpole Unknown V.B. Pearse eds Zooplankton Zooplankton sampling