A new thalassocypridine genus (Crusacea, Ostracoda) from brackish waters in the Indian and Pacific Oceans, with the description of a new species

Mangalocypria, a new genus of the tribe Thalassocypridini, is described, with a new species, and two previously described species, from Papua New Guinea, the Comoros and Indonesia. The new genus has a remarkable set of characters separating it from other members in the tribe: thin-shelled, translucent and smooth valves, V-process of lower lip developed as a rake, and postero- distal claw of furca fixed to shaft without a joint. The affinities of Mangalocypria gen. nov. with other genera is discussed, and some taxonomical problems in the tribe Thalassocypridini are commented upon. The diagnostic value of incompletely differentiated Zenker organs of premature males is discussed

On the distribution of alien non-marine and estuarine macro-crustaceans in Belgium

The distributions of fifteen species of macroscopic crustaceans living in non-marine and estuarine environments in Belgium are discussed. The species in question are: the conchostracan Leptestheria dahalacensis, the amphipods Gammarus tigrinus, Echinogammarus berilloni, Dikerogammarus villosus, Corophium curvispinum, Crangonyx pseudogracilis and Orchestia cavimana, the atyid shrimp Atyaephyra desmaresti, the crayfish Astacus leptodactylus, Pacifastacus leniusculus and Orconectes limosus and the crabs Callinectes sapidus, Eriocheir sinensis and Rhithropanopeus harrisii

The genus <i>Mungava</i> Harding, 1962 (Crustacea: Ostracoda) from Indo-Pacific brackish waters, with the description of two new species

Mungava munda Harding, type-species of the genus Mungava, and two new species, M. papuensis sp. nov. and M. intermedia sp. nov. are described and figured. A short supplementary description is given for M. marthapuriae Keyser and M. riseri Maddocks on the basis of their paratypes. The genus diagnosis is extended. The interspecific differences and the distribution of the actually known species of the genus Mungava are discussed

Excitations in a non-equilibrium Bose-Einstein condensate of exciton-polaritons

We have developed a mean-field model to describe the dynamics of a non-equilibrium Bose-Einstein condensate of exciton-polaritons in a semiconductor microcavity. The spectrum of elementary excitations around the stationary state is analytically studied in different geometries. A diffusive behaviour of the Goldstone mode is found in the spatially homogeneous case and new features are predicted for the Josephson effect in a two-well geometry.Comment: 5 pages, 2 figure

A new species of the genus <i>Pontocypria</i> (Crustacea, Ostracoda), commensal of a lamellariid gastropod

Pontocypria coriocellae sp. n. is described from Papua New Guinea. The species was found inside the oral tube near the radula, of Coriocella nigra Blainville, 1824 (Gastropoda, Prosobranchia, Lamellariidae). Because of its morphology and its mode of life, the new species may be considered as an occasional commensal of its gastropod hosts. It is the first Pontocypria species to be found inside its host. The distribution of the genus Pontocypria is discussed

A new genus of the family Pontocyprididae (Crustacea, Ostracoda) from the Indian and Pacific Oceans, with the description of two new species

A new pontocypridid genus, Peripontocypris gen. nov. and two new species are described from the Maldive Islands, Papua New Guinea and from Easter Island. The new genus has a remarkable set of characters, which are unknown in other members of the family: six adductor muscle scars, a Y-shaped Zenker's organ and a large furca. Some other characters of the valves and the soft parts are reminiscent of different pontocypridid genera, and suggest a mosaic type of evolution. The affinities of Peripontocypris with other genera, and its taxonomic position are discussed

On the distribution of <i>Cyprideis torosa</i> (Jones) (Crustacea, Ostracoda) in Africa, with the discussion of a new record from the Seychelles

We revised the taxonomy of the East African Lophuromys flavopunctatus species complex using craniometric data of nearly 3000 specimens grouped in 49 operational taxonomical units (OTU's) covering the whole of its geographical distribution. Our study demonstrates that the differences in age and sex composition of OTU's are of no consequence for the branching of the obtained phenetic trees. This observation permitted us to screen the whole of the L. flavopunctatus s.l. species complex, to evaluate the validity of the already known taxa and to describe two species new to science. Our study complements this traditional morphological approach with mitochondrial nucleotide sequences to characterize the two new species and several OTU's