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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Molecular phylogeny of hemichordata, with updated status of deep-sea enteropneusts. Mol.
Notably, support for enteropneust monophyly is moderate (65/0.99), and SH testing did not reject the alternative hypothesis (enteropneust paraphyly).
EXTERNALLY BROODING ENTEROPNEUST Table 1 Specimen and sequence identification 18S 16S Voucher Citation Torquaratoridae Yoda purpurata JN886757 JNSS6740 NHMUK 2011.5 Osborn et (117l-36a) al., 2012 Yoda purpurata JN886758 JN886741 NHMUK 2011.6 Osborn et (117l-36b) al., 2012 Yoda purpurata JN886759 JN886742 NHMUK 2011.9 Osborn et (1174-43a) al., 2012 Genus B sp.
A comparative molecular approach to mesodermal patterning in basal deuterostomes: the expression pattern of Brachyury in the enteropneust Ptychodera flava.
It is robust and can be collected intact, unlike many other species of enteropneust, which are fragile and easily broken.
Given the unquestionable shared form of the hemichordate pharynx with that of fossil echinoderms and protochordates, I decided to investigate the potential for filter feeding in the enteropneust worm Harrimania planktophilus.
How is the pterobranch feeding apparatus and ciliation similar to an enteropneust's proboscis and collar?
"Our description of Spartobranchus tenuis, a creature previously unknown to science, pushes the fossil record of the enteropneusts back 200 million years to the Cambrian period, fundamentally changing our understanding of biodiversity from this period," he added.
The discovery of a 500-million-year-old penis-shaped fossil has provided a missing link that pushes back evolution of enteropneusts by 200 million years.
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 1.5 miles below the surface of the Atlantic Ocean.