NEW AMPITHOID AMPHIPODS FROM PORT JACKSON, NEW-SOUTH-WALES, AUSTRALIA(CRUSTACEA, AMPHIPODA, AMPITHOIDAE)

Seven species of ampithoid amphipods are reported from subtidal macroa lgae living in Port Jackson, Sydney, Australia. In the genus Ampithoe the Indo-West Pacific species Ampithoe kava Myers, 1985, is recorded f or the first time from Australia, and two new species, A. caddi, sp. n ov. and A, ngana, sp. nov., are described. One new species of Cymadusa , C. munnu, sp. nov., is described. The genera Exampithoe (Melanesius) , Peramphithoe and Plumithoe are recorded for the first time from Aust ralian waters. The new species E. (M.) kutti, sp. nov. and Peramphitho e parmerong, sp. nov. are described, and Plumithoe quadrimana (Haswell , 1879b), comb. nov. is redescribed and a neotype is selected. New eco logical and behavioural information is presented for these species. A new key and diagnoses for all known genera of Ampithoidae are presente d. Paradusa Ruffo, 1969 is synonomised with Cymadusa Savigny, 1816. Ex ampithoe (Melanesius) gracilipes Ledoyer, 1984 is transferred to Examp ithoe (Exampithoe) and Cymadusa uncinata Stout, 1912 and C. variata Sh eard, 1936 are transferred to Paragrubia.