This is the first record of the family Megaluropidae in Australian waters. Gibberosus udarus sp. nov. is described here from Lizard Island, Great Barrier Reef. Megaluropids are sediment-dwelling amphipods that recline in an inverted position, with their legs and antennae projecting from the sediment surface (Barnard et al. 1988). Previously, megaluropids were known from eastern and western Africa (Schellenberg 1925; Ledoyer 1968, 1975), the eastern Pacific (J.L. Barnard 1969; Thomas & Barnard 1986; Ortiz & Lalana, 2002) and the Caribbean Sea (McKinney 1980; Thomas & Barnard 1986). This new species extends the distribution of the Megaluropidae to Australia. Gibberosus udarus sp. nov. is the sixth species described in the genus. Gibberosus is now recorded from the Caribbean, G. myersi (McKinney, 1980); California, G. falciformis (J.L. Barnard, 1969), G devaneyi Thomas & Barnard, 1986); Pacific Panama G. coibaensis Ortiz & Lalana, 2002; Nigeria, G. longimerus (Schellenberg, 1925) and the Great BarrierReef, Australia, G. udarus sp. nov.
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