Assertion: arthropod's head | /r/MadeOf | acronal remnant
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text: The view that the arthropod head must contain an acronal remnant has been shaken by the relatively recent revision of protostome phylogeny, which has dismantled the Articulata and placed the arthropods together with a group of unsegmented worms often referred to as the Cycloneuralia in the so-called Ecdysozoa.