Gondwanothrix halsei is a species of small crustaceans (ca. 1.0–1.3 millimetres or 0.039–0.051 inches) within the order Cladocera, in the suborder Anomopoda, placed in its own family, Gondwanotrichidae. It exists in a macrotrichid habitus found in humic coastal dune lakes and swamps in southwest Western Australia.