| Phreatoicidea Temporal range: | |
|---|---|
 | |
| Eophreatoicus , a freshwater isopod from Kakadu National Park, Australia | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Isopoda |
| Suborder: | Phreatoicidea Stebbing, 1893 [1] |
Phreatoicidea is a suborder of isopod crustaceans. Extant species are confined to freshwater environments in South Africa, India, and Oceania. [2] This seemingly Gondwana-derived distribution belies the fact that the group once had a cosmopolitan distribution; fossils which can be assigned to the Phreatoicidea are the oldest isopod fossils, and are found throughout the world. [3] [4] In the intervening 325 million years, phreatoicideans have changed little, and are thus considered living fossils. [5]
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The first Australian phreatoicidean was described by Charles Chilton in 1891. [5] Two families are represented in Australia: Amphisopodidae in the interior of Australia, and in the west, and Phreatoicidae in New South Wales, Victoria and Tasmania. [6]
