Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. IV. On Nototanoides trifurcatus Gen. Nov., Sp. Nov., with a Key to the Genera of the Nototanaidae

Nototanoides trifurcatus gen. nov., sp. nov. is described and illustrated from the Gulf of Mexico. Nototanoides differs from the other genera of the family by the male possessing a vestigial maxilliped. It most closely resembles the genera Nototanais and Androtanais. In addition to the differences of the maxillipeds the males of Nototanoides can be separated by the 4-segmented antenna 1 and the females are distinguished by the trifurcate spine on the second segment of the palp of the maxilliped. A key to known genera of the family Nototanaidae is presented

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. III. On the Occurrence of Teleotanais gerlachi Lang, 1956 (Nototanaidae) in the Eastern Gulf

Teleotanais gerlachi Lang, 1956, a euryhaline member of the family Nototanaidae, known from Brazil and El Salvador, is reported from the eastern Gulf of Mexico (west coast of Florida) and the west coast of Africa (Nigeria). The species is diagnosed and illustrated. Differences between Teleotanais and the superficially similar genus Paratanais (Pantanaidae) are briefly compared and discussed

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. III. On the Occurrence of Teleotanais gerlachi Lang, 1956 (Nototanaidae) in the Eastern Gulf

Teleotanais gerlachi Lang, 1956, a euryhaline member of the family Nototanaidae, known from Brazil and El Salvador, is reported from the eastern Gulf of Mexico (west coast of Florida) and the west coast of Africa (Nigeria). The species is diagnosed and illustrated. Differences between Teleotanais and the superficially similar genus Paratanais (Pantanaidae) are briefly compared and discussed

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. IV. On Nototanoides trifurcatus Gen. Nov., Sp. Nov., with a Key to the Genera of the Nototanaidae

Nototanoides trifurcatus gen. nov., sp. nov. is described and illustrated from the Gulf of Mexico. Nototanoides differs from the other genera of the family by the male possessing a vestigial maxilliped. It most closely resembles the genera Nototanais and Androtanais. In addition to the differences of the maxillipeds the males of Nototanoides can be separated by the 4-segmented antenna 1 and the females are distinguished by the trifurcate spine on the second segment of the palp of the maxilliped. A key to known genera of the family Nototanaidae is presented

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. VI. On the Genus Mesotanais Dollfus, 1897 with Descriptions of Two New Species, M. longisetosus and M. vadicola

Two new species of tanaidaceans belonging to the family Leptocheliidae were collected from the continental shelves and slopes of the eastem and Gulf coasts of the United States. Both of these species are assigned to the poorly known genus Mesotanais Dollfus, 1897. Mesotanais is unique within the Leptocheliidae because its members lack eyes. The second supposedly important generic character, uniramous uropods, reported in the original description is considered to be a misdiagnosis. The assumption of this error is supported by the rediscovery of the type-species, Mesotanais dubius Dollfus, 1897 (Sieg and Bird, in press). In the present study, the genus Mesotanais is rediagnosed and the two new species from the western Atlantic are described. Mesotanais longisetosus n. sp. can be distinguished from M. vadicola n. sp. by a variety of characters including the much longer terminal setae on antenna 1, the distinctly more elongate carpus of the cheliped, and the shape of the pars molaris of the mandible. Mesotanais longisetosus appears to be closely related to the type-species, M. dubius known from the eastern Atlantic. It is distinguished from M. dubius by having an elongate distal seta on the carpus and more styliform dactylus of the first peraeopod, and by the presence of two short, distal, tergal spines on the merus of peraeopods 4-6. Mesotanais vadicola occurred at depths of 22-865 m, while M. longisetosus was collected mainly from the upper continental slope at depths of 545-1386 m. Between 500 m and 900 m there is a broad area of overlap in the distribution of the two species, but with increasing depth M. vadicola is replaced by M. longisetosus

Stability of antiphase line defects in nanometer-sized boron-nitride cones

We investigate the stability of boron nitride conical sheets of nanometer size, using first-principles calculations. Our results indicate that cones with an antiphase boundary (a line defect that contains either B-B or N-N bonds) can be more stable than those without one. We also find that doping the antiphase boundaries with carbon can enhance their stability, leading also to the appearance of localized states in the bandgap. Among the structures we considered, the one with the smallest formation energy is a cone with a carbon-modified antiphase boundary that presents a spin splitting of about 0.5 eV at the Fermi level.Comment: 5 two-column pages with 2 figures Accepted for publication in Physical Review B (vol 70, 15 Nov.

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. II. The Occurrence of Halmyrapseudes bahamensis Băcescu and Gutu, 1974 (Apseudidae) in the Eastern Gulf with Redescription and Ecological Notes

Halmyrapseudes bahamensis Băcescu and Gutu, 1974 is reported from two localities in the northeastern Gulf of Mexico. A redescription is presented based on examination of type material and a large collection of Gulf specimens. Ecological notes are presented on the occurrence, seasonality and distribution of H. bahamensis in two tidal marsh systems near St. Marks, Florida. The taxonomic status of H. bahamensis in relation to the two other described species of Halmyrapseudes is discussed

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. I. Introduction and an Annotated Bibliography of Tanaidacea Previously Reported from the Gulf of Mexico

A brief summary of the biology and a historical review are presented for the Tanaidacea. An annotated bibliography is provided for published reports and records of Tanaidacea from the Gulf of Mexico

Complete genome sequence of a novel avian polyomavirus isolated from Gouldian finch: Complete genome sequence of a novel avian polyomavirus isolatedfrom Gouldian finch

A novel polyomavirus was identified in a fatally diseased Gouldian finch (Erythrura gouldiae). The new polyomavirus, strain VL 1209, was detected using a broad-spectrum nested PCR