Cnidaria 8 Hydrozoa Aeginidae 4 Antarctica 4 Coelenterata 4 King George Island 4 Narcomedusae 4 Potter Cove 4 South Shetland Islands 4 new genus 4 new species 4 plankton 4 Argentina 2 Assemblages 2 Atlantic Ocean 2 Atlantic Ocean (Southwest) 2 Biogeography 2 Buenos Aires [Argentina] 2 Buenos Aires province 2 Fungi 2 Genus hydra 2 Hydra 2 Hydra vulgaris 2 Hydroida 2 Invertebrata 2 Mollusca 2 Mytilus edulis 2 Pectinidae 2 Polychaeta 2 Richness 2