Acorn worms, also known as enteropneust (literally, ‘gut-breathing’) hemichordates, are marine invertebrates that share features with echinoderms and chordates. Together, these three phyla comprise ...
The mystery of chordate origins has endured for more than 150 years. Shortly after Darwin's On the Origin of Species, acorn worms were discovered to have chordate-like pharyngeal gill slits 1,2 and to ...
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