32 research outputs found
Population structure of the grapsid crab, Helice tridens latimera (PARISI) in the Taiho mangrove, Okinawa, Japan
Grapsid crab Helice tridens latimera inhabiting mangroves, seashores as well as muddy and
rocky areas. Ovigerous females were observed from December to May. Juveniles appeared
in July and from December to April. In the laboratory they reached 9.50 mm in carapace
width 4 months after hatching. It is likely that spawning of this crab occurs throughout
the year
Larval development of a semi terrestrial mangrove sesarmine crab Chasmagnathus convexus (Crustacea: Decapoda: Brachyura: Grapsidae) reared in laboratory
Four zoeal stages and one megalopal stage were identified in laboratory reared
semiterrestrial mangrove sesarmine crab Chasmagnathus convexus. At an average salinity
and temperature of 20±1% and 19.2±0.2°C, the megalopa was attained 24 days after
hatching. Morphologically, the first zoae of C. convexz1s is very similar to those of other
species of the genus Chasmagnathus as well as species of the genus Helice, in that view all
share the following characteristics: lateral spine on the carapace, three pairs of setae on
the posterior margin of the telson furca, one plus five setae on the endopod of the
maxillule, and two plus two setae on the endopod of the maxilla. The differences
between the first zoea and megalopa of and those of its congeners are discussed
Proof-of-principle experiment for laser-driven cold neutron source
The scientific and technical advances continue to support novel discoveries by allowing scientists to acquire new insights into the structure and properties of matter using new tools and sources. Notably, neutrons are among the most valuable sources in providing such a capability. At the Institute of Laser Engineering, Osaka, the first steps are taken towards the development of a table-top laser-driven neutron source, capable of producing a wide range of energies with high brightness and temporal resolution. By employing a pure hydrogen moderator, maintained at cryogenic temperature, a cold neutron (≤25meV) flux of ∼2×103n/cm2/pulse was measured at the proximity of the moderator exit surface. The beam duration of hundreds of ns to tens of \upmu \hbox {s}μsis evaluated for neutron energies ranging from 100s keV down to meV via Monte-Carlo techniques. Presently, with the upcoming J-EPoCH high repetition rate laser at Osaka University, a cold neutron flux in orders of ∼1×109n/cm2/sis expected to be delivered at the moderator in a compact beamline
Atyid shrimps (Crustacea: Decapoda: Caridea) of the Ryukyu Islands, southern Japan, with descriptions of two new species
10.1080/00222930601084049Journal of Natural History4038-402123-2172JNAH
Report on a collection of freshwater shrimps (Crustacea: Decapoda: Caridea) from the Philippines, with descriptions of four new species
Raffles Bulletin of Zoology542245-27
A first record of anchialine crab of the genus Orcovita Ng and Tomascik, 1994 (Decapoda: Brachyura: Varunidae) from Japan, with description of the species
10.1007/s10201-006-0176-yLimnology73147-15
The first-stage zoeas of Carpilius convexus (Forskål, 1775) and Carpilius maculatus (Linnaeus, 1758) (Crustacea: Decapoda: Brachyura: Xanthoidea: Carpiliidae): An example of heterochrony
10.1093/plankt/fbh169Journal of Plankton Research272211-219JPLR
A revision of the Geothelphusa levicervix species group (Crustacea: Decapoda: Brachyura: Potamidae), with descriptions of three new species
10.1080/00222930600773378Journal of Natural History4013-14759-781JNAH
On the species of Japanese atyid shrimps (Decapoda: Caridea) described by William Stimpson (1860)
10.1651/C-2572.1Journal of Crustacean Biology263392-419JCBI