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Labidiaster annulatus is a large, multi-armed sea star common in moderate depths along the Antarctic Peninsula and off the islands of the Scotia Arc. Analyses by frequency of occurrence and several volumetric methods of stomach contents from 194 individuals from South Georgia, the South Sandwich Islands, and the Antarctic Peninsula show L. annulatus is an active and opportunistic predator and scavenger on prey from at least 10 phyla. Most common prey are euphausiids and amphipods which are caught initially by large, crossed, toothed pedicellariae arranged in wreaths on annuli along the arms and subsequently retained and passed to the oral surface and along the ambulacral groove to the mouth by the action of flexible arms and tube feet. L. annulatus obtains food, including activelyswimming crustaceans and small fish, directly from the water column, and to a lesser degree from within and on the substrate. Patterns of surface ciliation suggest that no methods of feeding involving cilia are utilized. Differences in the size and function of crossed pedicellariae, sources and types of prey and methods of prey capture now suggest that L. annulatus is not an ecological equivalent of Pycnopodia helianthoides from western North America.

Diet, feeding behavior, and surface morphology of the multi-armed Antarctic sea star Labidiaster annulatus (Echinodermata Asteroidea)