Callianira antarctica is a species of ctenophore that physically resembles Mertensia ovum, but lacks the oil sacs.

[2] Callianira antarctica has been found in the waters of Southern Chile and Argentina, specifically the Strait of Magellan and Beagle Channel.

[7] Callianira antarctica is carnivorous, and primarily hunts copepods, but during winter months will eat pteropods, and larval / juvenile krill.

[8] Observed specimens gut contents show that they feed on species such as Calanoides acutus, Limacina helicina,[1] Calanus propinquus, metridia gerlachi, and larval/juvenile Euphausia superba.

C. antarctica needs carbon and lipids from its prey to survive, and it is thought that these needs increase during the winter months, and when in the juvenile stage of life.