Taxonomy Tournament: Invertibrates
Pterobranchia. This class is made up of small worm-shaped sessile marine filter feeders that life in secreted tubes.
Tardigrada. This phylum is made up of tardigrades, also known as water bears, eight-legged segmented micro-animals. They're among the most resilient animals, able to survive high and low extremes in temperature and pressure.
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Water is a key ingredient to all life on Earth, yet tardigrades with their near immortal-like powers can somehow endure being sapped of almost all their H2O.
Now, researchers have discovered another trick these chubby microscopic anomalies use to survive years of extreme dehydration.
"Although water is essential to all life we know of, some tardigrades can live without it potentially for decades," says University of Tokyo biologist Takekazu Kunieda.
[...]
"After testing several different kinds, we have found that cytoplasmic-abundant heat soluble (CAHS) proteins, unique to tardigrades, are responsible for protecting their cells against dehydration," Kunieda explains.
Using experiments in human and insect cells, the researchers were able to demonstrate CAHS proteins increase cell stiffness, buttressing the cell against shrinkage caused by lost water pressure. The proteins even protected cells against too much water pressure as well.
Continue Reading.
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me and my mutuals are like tardigrades. we're tough enough to survive almost any conditions...plus there's the whole "tard" part.
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Taxonomy Tournament: Ecdytes
Tardigrada. This phylum is made up of tardigrades, also known as water bears, eight-legged segmented micro-animals. They're among the most resilient animals, able to survive high and low extremes in temperature and pressure.
Euonychophora. This phylum is made up of velvet worms, long soft-bodied many-legged invertibrates. They are the only phylum of animal to exist on land but not water. They have slime glands on their heads, which produce and squirt slime they use to ensnare prey and deter predators.
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will you still find me attractive when i step out of the shower only wearing water bear slippers ?
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Just a reminder that in 2019, a shipment of tardigrades, aka moss piglets, crash-landed on the moon. These little guys are also able to survive in the most extreme environments, including in space. So the moon may very well be populated by moss piglets.
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As one form of extremotolerance, tardigrades can survive almost complete desiccation by entering a dormant state called anhydrobiosis (i.e., life without water), which allows them to reversibly halt their metabolism.
The authors were surprised by the sheer number of independent duplications of heat-soluble genes, which painted a much more complex picture of anhydrobiosis-related gene evolution.
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