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The Hyperiidea is one ot the six suborders of , small aquatic . Unlike some other suborders of Amphipoda, hyperiids are exclusively marine and do not occur in fresh water. Hyperiids are distinguished by their large eyes and habitat. Most species of hyperiids are or of and jellyfish in the plankton, although Themisto gaudichaudii and a few relatives are free-swimming predators of and other small planktonic animals.
Some controversy exists as to the number of families in the Hyperiidea, being given as between 20 and 23 depending on whether groups like the Thaumatopsidae are considered distinct or not. The taxonomy of Hyperiidea currently accepted by the World Register of Marine Species is as follows:
In the Streetsia challengeri, the left and right eyes fused to form a single cylindrical eye made of ~2500 ommatidia. It can see all around, but not ahead or behind.
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