Cubozoa

class of cnidarians

irukandji jellyfish

Chirodropida is an order of box jellyfishes. They can be distinguished from other box jellyfish by the presence of branched muscular bases at the corners of their cubic umbrella, and of small saccules associated with the gastric cavity. They typically have multiple tentacles at each corner.

Carybdeida is an order of box jellyfish. It contains five families. They are distinguished from other box jellyfish by possessing unbranched muscular bases at the corners of the cubic umbrella. Most species have four tentacles.