BENTHEDI, BIOCAL, BIOGEOCAL, Restreint, MD32 (REUNION), MUSORSTOM 5

Ten genera and fourteen species of lysianassoid amphipods are reported from Philippine and Indonesian waters. Nine of these are new species (Aristias coriolis, A. verdensis, Eucallisoma barnardi, Figorella corindon, Onesimoides castellatus, 0. mindoro, Paracentromedon pacificus, Pseudamaryllis andresi and Trischizostoma crosnieri). Five of the genera (Eucallisoma, Figorella, Paracentromedon, Pseudamaryllis and Trischizostoma) are new records for the south-east Asian area. Only four species (Cyphocaris anonyx Boeck, 1871, Ichnopus wardi Lowry & Stoddart, 1992, Onesimoides castellatus and 0. mindoro) are recorded from both areas.

CORINDON 2, KARUBAR, MUSORSTOM 1, MUSORSTOM 2, MUSORSTOM 3

There are currently 20 lysianassoid amphipod species known from the tropical western South Pacific Ocean. We report on 32 species from the area, including one new genus (Coriolisa) and 19 new species (Aristias thio, A. uokonia, Bathyamaryllis ouvea, Clepidecrella tropicalis, Coriolisa novacaledonia, Cyphocaris bellona, Hippomedon vao, Kerguelenia koutoumo, K. lifou, Lepidepecreella sarcelle, Onesimoides abyssalis, Socarnes rurutu, S. tiendi, S. tuscarora, Socarnopsis honiara, S. tandai, Trischizostoma richeri, Tryphosella ama and T. oupi). This brings the total species known from the area to 46.

BIOCAL, BIOGEOCAL, CALSUB, LAGON, MUSORSTOM 4, MUSORSTOM 7, SMCB, VAUBAN 1978-1979

Based on new material from the western Pacific and Indian Oceans, the deep-sea scavenging genus Bathynomus is revised. Six species are redescribed: Bathynomus affinis Richardson, 1910 (range extended to the Arafura and Timor Seas), B. decemspinosus Shih, 1972, B. doederleini Ortman, 1894 (range extended to San Bernardino Strait, Philippine Islands), B. immanis Bruce, 1986 (range extended to Astrolabe Bay, Bismarck Sea), B. kapala Griffin, 1975 (range extended to off the Great Barrier Reef, Coral Sea) and B. pelor Bruce, 1986. Bathynomus propinquus Richardson, 1910 is considered to be a nomen dubium. Six new species are described: B. brucei n. sp. from off the Great Barrier Reef, Coral Sea; B. bruscai n. sp. from off the Great Barrier Reef, Coral Sea and Astrolabe Bay, Bismarck Sea; B. crosnieri n. sp. from off Madagascar, western Indian Ocean; B. keablei n. sp. from off the Malabar Coast, Arabian Sea; B. kensleyi n. sp. from the South China Sea, the Sulu Sea and the Coral Sea; B. richeri n. sp. from off New Caledonia, plus Bathynomus sp. from the Gulf of Aden. Bathynomus giganteus A. Milne Edwards, 1879 is reported for the first time from the east coast of the United States. Two distinct groups occur in Bathynomus, a lineage of giant species which mature at about 150 mm length and a lineage of supergiant species which can grow to 500 mm in length. The greatest diversity of Bathynomus occurs between latitudes 20°N and 20°S on the Indian-Australian plate. Outlying species occur on plates in the western North Pacific and the western Atlantic.

BATHUS 1, BATHUS 2, MUSORSTOM 2

Didymocheliid amphipods are extremely rare. Didymochelia ledoyeri sp. nov. is described from New Caledonian material. It is only the fourth specimen collected and the third species described. This is the first record of the family outside the subantarctic area.

CALSUB

The uristid genus Ichnopus is revised and Glycerina included in its synonymy. A key is provided to the world species. Ichnopus pelagicus Schellenberg, I. pseudoserricrus Ledoyer, I. serricrus Walker, I. spinicornis Boeck, I. taurus Costa, (type species), I. tenuicornis (Haswell), I. teretis (Andres) and I. woodmasoni (Giles) are redescribed. The new species I. annasona, I. capricornus, I. caritus, I. comorensis, I. cribensis, I. malpatun, I. parriwi and I. wardi are described. Ichnopus nossibeensis Ledoyer is considered to be a synonym of I. pelagicus. Ichnopus macrobetomma Stebbing is considered to be an unrecognisable species. Two species groups are recognised: the I. spinicornis group, in which the ischium and carpus of gnathopod 1 are long and most species are pelagic, probably micropredators; and the I. taurus group, in which the ischium and carpus of gnathopod 1 are very long and most species are demersal scavengers. Ichnopus is considered to be . A tropical to warm temperate Indo-Pacific genus with some remnants in the Mediterranean and the eastern North Atlantic Ocean. The most primitive species in both groups are found in the Mediterranean Sea and the eastern North Atlantic. It appears that the modern genus had its origins in the old Tethyan fauna.

BENTHEDI, BIOCAL, MD32 (REUNION), MUSORSTOM 4, Restreint, SMCB

We present an updated classification for the entire Crustacea Decapoda, listing all known families and genera organized by higher taxonomic groups and including estimates of the number of species in every genus. All taxonomic names are also linked to the verified literature in which they were described, the first compilation of its kind for the Decapoda. To arrive at this compilation, we began with the classification scheme provided by Martin & Davis (2001) for extant families,, updated the higher classification and included the fossil taxa. The resultant framework was then populated with the currently valid genera and an estimate of species numbers within each genus. Our resulting classification, spanning both extant (living) and fossil taxa, is the first comprehensive estimate of taxonomic diversity within the entire Decapoda. The classification consists of 233 families of decapods containing 2,725 genera and an estimated 17,635 species (including both extant and fossil species). Of the families in our classification, 53 are exclusively fossil, 109 contain both fossil and extant species, and 71 are extant only. The current estimate for extant species is 14,756, whereas 2,979 species are known exclusively as fossils.

AURORA 2007, MAINBAZA

Eurythenes gryllus is redescribed based on the holotype of Gammarus gryllus Lichtenstein in Mandt, 1822; the holotype of Lysianassa magellanica H. Milne Edwards, 1848; and one of the specimens used by Lilljeborg (1865a) when establishing the genus Eurythenes. Eurythenes obesus (Chevreux, 1905), is redescribed and a neotype is established. New material of E. gryllus and E. obesus is recorded from Australasian waters. Eurythenes thurstoni n. sp. is described and Eurytheneidae n. fam. is established for this genus within the Lysianassoidea.

BIOGEOCAL, KARUBAR, MUSORSTOM 7, SMCB