Relating to or belonging to the phylum Enteropneusta, the group of acorn worms and their relatives.
From Enteropneusta + '-al' (adjectival suffix). This adjective form describes anything characteristic of or related to the enteropneust animals.
When scientists use the adjective 'enteropneustal' to describe gill slits or body structures, they're pointing out features that look ancient and primitive—exactly what you'd expect from creatures that haven't changed much in 500 million years.
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