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Ancient trapped water explains Earth's first ice age

Tiny bubbles of water found in quartz grains in Australia may hold the key to understanding what caused the Earth's first ice age, say scientists.

Space & Earth - Earth Sciences

Jun 05, 2013

5 / 5 (10)

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'Caldas tear' resolves puzzling seismic activity beneath Colombia

Colombia sits atop a complex geological area where three tectonic plates are interacting, producing seismicity patterns that have puzzled seismologists for years. Now seismologists have identified the "Caldas ...

Space & Earth - Earth Sciences

Jun 06, 2013

4.7 / 5 (3)

Expedition to study ancient continental breakup west of Spain

An international team of scientists has embarked on a shipboard expedition to study how the Earth's crust was pulled apart in an area beneath the Atlantic Ocean off the coast of Spain. The team includes geophysicists ...

Space & Earth - Earth Sciences

May 27, 2013

4.5 / 5 (2)

Crustacean

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.

This text uses material from Wikipedia, licensed under CC BY-SA

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