Box jellyfish
In Australia (mainly northern; however, box jellyfish can live in subtropical waters as far south as Sydney, with "Carybdea marsupialis" being recorded as far south as Bermagui, Sapphire Coast) the highest risk period for the box jellyfish is between October and May, but stings and specimens have been reported all months of the year. Similarly, the highest risk conditions are those with calm water and a light, onshore breeze; however, stings and specimens have been reported in all conditions.
Carybdea
Carybdea is the only genus of venomous box jellyfish in the family Carybdeidae. "Carybdea sivickisi" is known as the smallest species in the genus and is sexually dimorphic.As of August 2013, the following genera previously classified in this family have been reassigned to the family Carukiidae: