acorn worm


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acorn worm

a hemichordate, one of the three groups of invertebrate chordates collectively referred to as PROTOCHORDATES.
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It's astonishing how similar Spartobranchus tenuis fossils are to modern-day acorn worms, except that they also formed fibrous tubes.
Researchers say these tubes were lost in the lineage that resulted in modern-day acorn worms, but were retained through graptolites and pterobranchs.
Tergivelum cinnabarinum is the name given to a vibrant scarlet-orange acorn worm -- cinnabarinum is Latin for cinnabar which is a red colored mineral.
It is only 10 years since the first species of deep sea torquaratorid acorn worm was found in the Pacific Ocean; now we have three new species from the Atlantic it seems different species will be found throughout the deep sea.
Yoda purpurata -- to be exact -- is the name now given by a University of Aberdeen-led team of scientists to one of three new species of deep sea acorn worms or Enteropneusts discovered 2,500m or around 1.
Acorn worms are themselves part of the hemichordates, a group of marine animals closely related to today's sea stars and sea urchins.
It's astonishing how similar Spartobranchus tenuis fossils are to modern day acorn worms, except that they also formed fibrous tubes," he noted.