A team of researchers from Australia, Switzerland and Japan has found evidence suggesting that the asteroid Vesta was stuck by a very large rock approximately 4.5 billion years ago. In their paper published in the journal ...
The huge magnetic field which surrounds the Earth, protecting it from radiation and charged particles from space—and which many animals even use for orientation purposes—is changing constantly, which is why geoscientists ...
Earth Sciences
Jun 06, 2019
5
151
In countless grade-school science textbooks, the Earth's mantle is a yellow-to-orange gradient, a nebulously defined layer between the crust and the core.
Earth Sciences
May 20, 2019
0
156
In 2020, NASA and European-Russian missions will look for evidence of past life on Mars. But while volcanic, igneous rock predominates on the Red Planet, virtually the entire Earth fossil record comes from sedimentary rocks.
Space Exploration
May 17, 2019
3
189
Eclogitic diamonds formed in Earth's mantle originate from oceanic crust, rather than marine sediments as commonly thought, according to a new study from University of Alberta geologists.
Earth Sciences
Apr 24, 2019
2
45
A team of researchers with members affiliated with several institutions in China, one in Canada and one in the U.S. has found evidence of naturally occurring photocurrents in inorganic mineral systems. In their paper published ...
The tectonic deformation and growth pattern of the western Kunlun, which is the northwestern margin of the Tibetan Plateau, are not currently well understood. The surface rupture caused by an earthquake can provide a unique ...
Earth Sciences
Apr 18, 2019
0
14
MAX phases are viewed as promising materials for the future, for example, in the power, aerospace and medical implants industries. A new method developed by scientists from Forschungszentrum Jülich now makes it possible ...
Materials Science
Apr 04, 2019
0
30
The heavy bombardment of terrestrial planets by asteroids from space has contributed to the formation of the early evolved crust on Earth.
Earth Sciences
Jan 31, 2019
0
20
The surface of many Old Master paintings has been affected by the appearance of whitish lead-rich deposits, which are often difficult to fully characterise, thereby hindering conservation. Painted in 1663, Rembrandt's Homer ...
Analytical Chemistry
Jan 28, 2019
0
12
Thylacocephala? Branchiopoda
Remipedia Cephalocarida Maxillopoda
Ostracoda
Malacostraca
Crustaceans (Crustacea) form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles. The 50,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 12.5 ft (3.8 m) and a mass of 44 lb (20 kg). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by the nauplius form of the larvae.
Most crustaceans are free-living aquatic animals, but some are terrestrial (e.g. woodlice), some are parasitic (e.g. fish lice, tongue worms) and some are sessile (e.g. barnacles). The group has an extensive fossil record, reaching back to the Cambrian, and includes living fossils such as Triops cancriformis, which has existed apparently unchanged since the Triassic period. More than 10 million tons of crustaceans are produced by fishery or farming for human consumption, the majority of it being shrimps and prawns. Krill and copepods are not as widely fished, but may be the animals with the greatest biomass on the planet, and form a vital part of the food chain. The scientific study of crustaceans is known as carcinology (alternatively, malacostracology, crustaceology or crustalogy), and a scientist who works in carcinology is a carcinologist.
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