Chromodoris magnifica (Quoy & Gaimard, 1832), a new nudibranch host for the shrimp Periclimenes imperator Bruce

branchia; Chromodorus magnifica; new association. During the NNM/Maluku Expedition 1996, in the framework of the NNM Fauna Malesiana Marine Program, a shrimp belonging to the species Periclimenes imperator Bruce, 1967, was found on a nudibranch while diving at 20 m depth in Seri Bay, on the south coast of Ambon. Periclimens imperator has been recorded throughout the tropical Indo-West Pacific, from East Africa and the Red Sea to Hawaii, from nudi-branch and holothurian hosts. The nudibranch was identified as Chromodorus magnifica (Quoy & Gaimard, 1832) (see Rudman, 1982: 216-219, figs. 17A, B, 18, 19). The association with Chromodorus magnifica is recorded here for the first time. The Maluku Expedition 1996 was a joint coastal marine zoological research pro-gram of the National Museum of Natural History (NNM), Leiden, and the Pusat Penelitian dan Pengembangan Oseanologi (PPPO) in co-operation with the Balai Penelitian dan Pengembangan Sumberdaya Laut of LIPI-PPPO on Ambon. Abbreviation: pocl. = post orbital carapace length