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New Freshwater crab species discovered in Chinese Fish market by Researchers

Being a primarily aquatic species, the new crab prefers the pools of limestone hill streams, therefore its name Yuebeipotamon calciatile, where calciatile means 'living on limestone'

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BEIJING, September 8, 2016: An examination of the ornamental fish market in southern China has led to the discovery of a new species and even a new genus of freshwater crab, researchers have reported.

Knowing about the growing demand for eye-catching freshwater crabs from southern China, the authors took a look at the ornamental fish market to eventually identify an individual with unusually structured male gonopod, which in crustaceans is a swimming appendage modified to serve as a reproductive organ.

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Despite the superficial resemblance to an already existing freshwater crab genus, at second glance, the crab turned out to be quite distinct thanks to a unique set of features including the carapace, the monopod and the relatively long and slender legs.
Once the molecular analyses’ results were also in, the authors had enough evidence to assign the freshwater crab as a species and even a genus new to science.

Being a primarily aquatic species, the new crab prefers the pools of limestone hill streams, therefore its name Yuebeipotamon calciatile, where calciatile means ‘living on limestone’.

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To adapt to the habitat, the species seems to have developed its characteristic slender legs, which make it easier for the crab to climb and move around whenever the short-lived limestone hill streams make it search for a new home, the researchers reported in the journal ZooKeys.

The carapace of the new crab is usually coloured in maroon to dark brown, while the claws and legs are reddish to purplish, the study said. (IANS)

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US Researchers Redefine Conditions that Makes a Planet Habitable

The researchers also found that planets with thin ozone layers, which have otherwise habitable surface temperatures, receive dangerous levels of UV dosages

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Planet
Instruments, such as the Hubble Space Telescope and James Webb Space Telescope, have the capability to detect water vapor and ozone on a Planet. Pixabay

A team of US researchers has redefined the conditions that make a Planet habitable by taking the star’s radiation and the planet’s rotation rate into account – a discovery that will help astronomers narrow down the search around life-sustaining planets.

The research team is the first to combine 3D climate modeling with atmospheric chemistry to explore the habitability of planets around M dwarf stars, which comprise about 70 per cent of the total galactic population.

Among its findings, the Northwestern team, in collaboration with researchers at the University of Colorado Boulder, NASA’s Virtual Planet Laboratory and the Massachusetts Institute of Technology, discovered that only planets orbiting active stars — those that emit a lot of ultraviolet (UV) radiation — lose significant water to vaporization.

Planets around inactive, or quiet, stars are more likely to maintain life-sustaining liquid water.

The researchers also found that planets with thin ozone layers, which have otherwise habitable surface temperatures, receive dangerous levels of UV dosages, making them hazardous for complex surface life.

“It’s only in recent years that we have had the modeling tools and observational technology to address this question,” said Northwestern’s Howard Chen, the study’s first author.

“Still, there are a lot of stars and planets out there, which means there are a lot of targets,” added Daniel Horton, senior author of the study. “Our study can help limit the number of places we have to point our telescopes”.

The research was published in the Astrophysical Journal.

Horton and Chen are looking beyond our solar system to pinpoint the habitable zones within M dwarf stellar systems.

M dwarf planets have emerged as frontrunners in the search for habitable planets.

Planet
A team of US researchers has redefined the conditions that make a Planet habitable by taking the star’s radiation and the planet’s rotation rate into account. Pixabay

They get their name from the small, cool, dim stars around which they orbit, called M dwarfs or “red dwarfs”.

By coupling 3D climate modeling with photochemistry and atmospheric chemistry, Horton and Chen constructed a more complete picture of how a star’s UV radiation interacts with gases, including water vapor and ozone, in the planet’s atmosphere.

Instruments, such as the Hubble Space Telescope and James Webb Space Telescope, have the capability to detect water vapor and ozone on exoplanets. They just need to know where to look.

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“‘Are we alone?’ is one of the biggest unanswered questions,” Chen said. “If we can predict which planets are most likely to host life, then we might get that much closer to answering it within our lifetimes.” (IANS)