Occurrence of Mysidopsis almyra Bowman, M. bahia Molenock and Bowmaniella brasiliensis Bacescu (Crustacea, Mysidacea) from the Eastern Coast of Mexico

Three species of mysids, Mysidopsis almyra, M. bahia and Bowmaniella brasiliensis are recorded for the first time from four locations along the eastern coast of Mexico. Data on geographical distribution, population structure, length, brood size, and morphological variation are given

Studies on the Crustacea of the Turks and Caicos Islands, British West Indies. V. Records of Mysids from Pine Cay, Fort George Cay, Water Cay, and Adjacent Waters

Only 2 species of mysids, Heteromysis spottei and Stygiomysis clarkei, have been previously reported from the Turks and Caicos Islands. Between 1988 and 1990, 21 species of mysids were collected from reef (to 38 m) and shallow non-reef habitats surrounding Pine Cay, Fort George Cay, and Water Cay, Turks and Caicos Islands. One species collected, Anchialina typica, is distributed throughout tropical and subtropical seas. Twelve species (Bowmaniella johnsoni, Dioptromysis paucispinosa, Heteromysis bermudensis, H. guitarti, H. mayana, Mysidium columbiae, M. gracile, M. integrum, Mysidopsis bispinulata, M. brattstromei, Parvimysis bahamensis, and Siriella chierchiae) are widely distributed throughout the subtropical and tropical waters of the Northwest Atlantic. Five species (Amathimysis serrata, A. torleivi, Heteromysis coralina, Mysidopsis mathewsoni, and Siriella chessi) are reported for only the second or third time. Three undescribed species are recognized: 2 species of Amathimysis associated with either gorgonians on reefs or grass beds and a species of Heteromysis collected from sponges on deeper reefs

An Annotated Checklist and Key to Hermit Crabs of Tampa Bay, Florida, and Surrounding Waters

Fourteen species of hermit crabs, belonging to 5 genera, were identified from 35 stations in Tampa Bay and adjacent continental shelf waters. Ninety-two samples were taken from the intertidal zone to 15 m with a variety of gear including dip nets, trawls, dredges, and hand collections using SCUBA. Pagurus maclaughlinae, Pagurus longicarpus, and Pagurus pollicaris were distributed throughout the bay. These species were often sympatric, and were commonly found in seagrass beds, sandy substrates, and sand/mud substrates, respectively. Clibanarius vittatus, Pagurus gymnodactylus, and Pagurus stimpsoni inhabited the higher salinity waters of the bay entrance. Paguristes sp., Paguristes hummi, Pagurus impressus and Petrochirus diogenes were collected from the lower bay to offshore on hard substrates and sand. Paguristes puncticeps, Paguristes sericeus and Pagurus carolinensis were collected only offshore on hard substrates. The latter species is reported from the Gulf of Mexico for the first time. Isocheles wurdemanni appears to be restricted to high energy beaches. An illustrated key as well as information on distribution, reproductive biology, taxonomic problems, symbionts, and coloration are presented

An Annotated Checklist and Key to Hermit Crabs of Tampa Bay, Florida, and Surrounding Waters

Fourteen species of hermit crabs, belonging to 5 genera, were identified from 35 stations in Tampa Bay and adjacent continental shelf waters. Ninety-two samples were taken from the intertidal zone to 15 m with a variety of gear including dip nets, trawls, dredges, and hand collections using SCUBA. Pagurus maclaughlinae, Pagurus longicarpus, and Pagurus pollicaris were distributed throughout the bay. These species were often sympatric, and were commonly found in seagrass beds, sandy substrates, and sand/mud substrates, respectively. Clibanarius vittatus, Pagurus gymnodactylus, and Pagurus stimpsoni inhabited the higher salinity waters of the bay entrance. Paguristes sp., Paguristes hummi, Pagurus impressus and Petrochirus diogenes were collected from the lower bay to offshore on hard substrates and sand. Paguristes puncticeps, Paguristes sericeus and Pagurus carolinensis were collected only offshore on hard substrates. The latter species is reported from the Gulf of Mexico for the first time. Isocheles wurdemanni appears to be restricted to high energy beaches. An illustrated key as well as information on distribution, reproductive biology, taxonomic problems, symbionts, and coloration are presented

A taxonomic guide to the mysids of the South Atlantic Bight.

Following the examination of extensive collections from the National Museum of Natural History (NMNH), the Southeastern Regional Taxonomic Center (SERTC), and other regional institutions, 18 species of the family Mysidae are recognized and described from the South Atlantic Bight (Cape Lookout, North Carolina to Cape Canaveral, Florida). This report includes synonymies of previous records, as well as new species distribution records. Previous regional accounts of Metamysidopsis munda and Metamysidopsis mexicana are attributed to Metamysidopsis swifti. New regional records are established for Amathimysis brattegardi, Heteromysis beetoni, and Siriella thompsonii. Two other species tentatively identified as Amathimysis sp. (nr. serrata) and Mysidopsis sp. (cf. mortenseni) may represent new taxa. Neobathymysis renoculata is included and discussed as a potential regional species. An illustrated key to the species currently known from the South Atlantic Bight is presented. Relevant taxonomic, distributional, and ecological information is also included for each species. (PDF file contains 45 pages.

Crustacea of the Cayman Islands, British West Indies. I. Records of Mysids from Shallow Water Non-Reef Habitats

A single species of mysid Siriella chierchiae has been previously reported from the Cayman Islands. However, between May 1995 and August 1999, 20 species of mysids were collected from shallow water non-reef habitats surrounding Grand Cayman and Little Cayman Islands. Of the species collected, one species Anchialina typica has a cosmopolitan distribution in tropical and subtropical seas. Thirteen species (Amathimysis cherados, A. gibba, Bowmaniella johnsoni, Dioptromysis paucispinosa, Heteromysis bermudensis, H. mayana, Mysidium columbiae, M. gracile, M. integrum, Mysidopsis bispinulata, M. brattstromi, Parvimysis bahamensis, Siriella chierchiae) are found widely distributed throughout the subtropical and tropical waters of the Northwest Atlantic. Four species (Heteromysis coralina, Mysidopsis mathewsoni, Siriella chessi, S. macrophthalma) previously known only from their type localities are reported, and two undescribed species of Heteromysis, one from Little Cayman Island, and one from Grand Cayman Island, are recognized

The IGF1 small dog haplotype is derived from Middle Eastern grey wolves

<p>Abstract</p> <p>Background</p> <p>A selective sweep containing the insulin-like growth factor 1 (<it>IGF1</it>) gene is associated with size variation in domestic dogs. Intron 2 of <it>IGF1 </it>contains a SINE element and single nucleotide polymorphism (SNP) found in all small dog breeds that is almost entirely absent from large breeds. In this study, we surveyed a large sample of grey wolf populations to better understand the ancestral pattern of variation at <it>IGF1 </it>with a particular focus on the distribution of the small dog haplotype and its relationship to the origin of the dog.</p> <p>Results</p> <p>We present DNA sequence data that confirms the absence of the derived small SNP allele in the intron 2 region of <it>IGF1 </it>in a large sample of grey wolves and further establishes the absence of a small dog associated SINE element in all wild canids and most large dog breeds. Grey wolf haplotypes from the Middle East have higher nucleotide diversity suggesting an origin there. Additionally, PCA and phylogenetic analyses suggests a closer kinship of the small domestic dog <it>IGF1 </it>haplotype with those from Middle Eastern grey wolves.</p> <p>Conclusions</p> <p>The absence of both the SINE element and SNP allele in grey wolves suggests that the mutation for small body size post-dates the domestication of dogs. However, because all small dogs possess these diagnostic mutations, the mutations likely arose early in the history of domestic dogs. Our results show that the small dog haplotype is closely related to those in Middle Eastern wolves and is consistent with an ancient origin of the small dog haplotype there. Thus, in concordance with past archeological studies, our molecular analysis is consistent with the early evolution of small size in dogs from the Middle East.</p> <p>See associated opinion by Driscoll and Macdonald: <url>http://jbiol.com/content/9/2/10</url></p

SEXTANT X-Ray Pulsar Navigation Demonstration: Additional On-Orbit Results

The Station Explorer for X-ray Timing and Navigation Technology (SEXTANT) is a technology demonstration enhancement to the Neutron-star Interior Composition Explorer (NICER) mission, a NASA Astrophysics Explorer Mission of Opportunity to the International Space Station, launched in June of 2017. In late 2017, SEXTANT successfully completed a first demonstration of in-space and autonomous X-ray pulsar navigation (XNAV). This form of navigation relies on processing faint signals from millisecond pulsars-rapidly rotating neutron stars that appear to pulsate in the X-ray band-and could potentially provide a GPS-like navigation capability applicable throughout the solar-system and beyond. In this work, we briefly review prior SEXTANT results and then present new results focusing on: making use of the high- flux but rotationally unstable Crab pulsar, and using XNAV to estimate position, velocity, and time in the presence of an imperfect local clock

Holographic Vitrification

We establish the existence of stable and metastable stationary black hole bound states at finite temperature and chemical potentials in global and planar four-dimensional asymptotically anti-de Sitter space. We determine a number of features of their holographic duals and argue they represent structural glasses. We map out their thermodynamic landscape in the probe approximation, and show their relaxation dynamics exhibits logarithmic aging, with aging rates determined by the distribution of barriers.Comment: 100 pages, 25 figure

Journal Staff

We present the first measurements of the differential cross section d sigma/dp(T)(gamma) for the production of an isolated photon in association with at least two b-quark jets. The measurements consider photons with rapidities vertical bar y(gamma)vertical bar &lt; 1.0 and transverse momenta 30 &lt; p(T)(gamma) &lt; 200 GeV. The b-quark jets are required to have p(T)(jet) &gt; 15 GeVand vertical bar y(jet)vertical bar &lt; 1.5. The ratio of differential production cross sections for gamma + 2 b-jets to gamma + b-jet as a function of p(T)(gamma) is also presented. The results are based on the proton-antiproton collision data at root s = 1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. The measured cross sections and their ratios are compared to the next- to- leading order perturbative QCD calculations as well as predictions based on the k(T)- factorization approach and those from the sherpa and pythia Monte Carlo event generators