mm do not appear to eat. These individuals are believed not have yet developed all of their secondary tentacles and they are therefore unable to catch prey. Scientists believe that H. antarcticus eats the largest prey it is able to handle. The largest individuals from South Georgia Island, Antarctica were found to consume calanoid copepods, while smaller individuals ate amphipods. The greatest proportion of the food of individuals from Chile appeared to be harpacticoid copepods followed by gammarid amphipods, chironomid fly larvae and podocopid ostracods. The remainder of the diet included empidid fly larvae, polychaete worms, isopods, juvenile decapod crustaceans and gastropods. Smaller adult individuals from the Chile population appeared to eat mostly copepods, while larger animals ate mostly amphipods. Lifecycle A recent genetic analysis has suggested that Microhydrula limopsicola, originally classified as a member of the order Limnomedusae, is in fact a developmental stage of Haliclystus antarcticus. In its mature form H. antarcticus has eight gonads which are organised into four pairs and run from the central mouth to the ends of the arms. The gonads are approximately 1.6–12.9 mm in length and are visible through the wall of the calyx. The gonads are mature in specimens which have a calyx height of about 11.72 mm and greater. Predation H. antarcticus is occasionally eaten by the fish Notothenia rossii. References External links Haliclystus antarcticus entry on WoRMS Haliclystidae Animals described in 1889