Southern Hemisphere Fresh Water Isopods - Suborder Phreatoicidea

Living fossils in Australia

Phreatoicideans (order Isopoda; suborder Phreatoicidea) are found in surface streams (like this isopod from Kakadu NT, Eophreatoicus Nicholls), in sphagnum swamps, springs and ground waters, in yabbie (crayfish) burrows, and even burrowing in soil. Phreatoicideans have a fossil record extending back 325 million years into the Palaeozoic, with fresh water fossils known from Triassic age (200mybp) shales of Sydney, NSW. Despite their long history, phreatoicideans show surprisingly little morphological differentiation. Eophreatoicus from Kakadu

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