A new species of Nicon Kinberg, 1866 (Polychaeta,Nereididae) from Ecuador,Eastern Pacific,with a?key?to?all known?species?of the genus

A new species of Nicon Kinberg, 1866 from the east Pacific coast of Ecuador is described. The new species is characterized by a long, thin dorsal ligule on median and posterior parapodia and infracicular sesquigomph falcigers in the neuropodia. A key to all species of Nicon is provided.     

On the cicada genus Nipponosemia Kato,with description of one new species from China (Hemiptera,?Cicadidae)

The cicada genus Nipponosemia Kato is reviewed. Four species are illustrated, photographed and described, including three known species and one new species. A key to all species of this genusis presented, and information on the biology of Nipponosemia are provided. The systematic status of the tribe Cicadatrini and biogeography of Nipponosemia are discussed.     

A remarkable new genus of leafhoppers (Hemiptera,Cicadellidae, Iassinae) from Southeast Asia

Tardrabassus pakneunensis, n. gen. & sp. is described and illustrated. The new genus shows morphological affinities to three leafhopper subfamilies, Tartessinae, Deltocephalinae, and Iassinae, but is tentatively placed in Iassinae based on the position of the ocelli, the reduced lateral frontal sutures, the leg chaetotaxy, and the structure of the male genitalia.     

Description of Careproctus guillemi n. sp. (Pisces: Scorpaeniformes) from Weddell Sea

Careproctus guillemi differs from the other Careproctus species in the following combination of characters: pectoral fin rays 22 (11 + 4+7); pectoral girdle with three round radials (1 + 0+ 1 + 1); mouth oblique and maxillary extending beyond posterior edge of eye. Relationships between C. guillemi and C. longipectoralis are provided. The endochondral pectoral girdle of C. longipectoralis is described for the first time.     

A revision of the Neotropical genus Paraberismyia Woodley (Diptera,Stratiomyidae, Beridinae) with three new species

The Neotropical genus Paraberismyia Woodley, 1995, is revised. Three new species, P. chiapas sp. n., P. mathisi sp. n., and P. triunfo sp. n. are described, all having type localities in Chiapas, Mexico. A key to the four known species is provided.     

Phylogeny of five Prosopium species with comparisons with other Coregonine fishes based on isozyme electrophoresis*

Phylogenetic relationships of Prosopium gemmifer, P. spilonotus, P. williamsoni, P. cylindraceum and P. coulteri species were determined based on variation at 37 allozyme loci, and compared with Stenodus and nine species of Coregonus. Of the three genera, Prosopium was the most distinct with Nei genetic distances to Coregonus of D=0·55—1·05 and to Stenodus of D=0·58—0·92. Stenodus and Coregonus were closely related but grouped as sister taxa with a mean genetic distance of 0·31 (range 0·22—0·40). These results agree with the degree of morphological differentiation among the genera as well as with observations concerning hybridization, e.g. many Coregonus species hybridize with Stenodus, but no natural hybrids are known between Prosopium and other coregonines. Within Prosopium, P. coulteri was the most divergent species branching out at D=0·51 from the others and followed by P. cylindraceum at D=0·28. The three remaining species are closely related. Among them P. williamsoni joins P. gemmifer and P. spilonotus at 0·04, and the distance between the two Bear Lake endemics is only 0·004. The distance between P. cylindraceum and the remaining Prosopium species is similar to distances between Stenodus and Coregonus. The small genetic distance between P. spilonotus and P. gemmifer suggests their recent divergence. Even though no fixed differences were found between them, diVerent alleles were present at two loci at large enough frequencies to indicate reproductive isolation. This confirms that P. gemmifer and P. spilonotus are good biological species as indicated by their distinct morphology and ecology.