I want to know the answer to the following question:
What subtypes of polychaetes were useless classifications, according to the 2007 study?
All the background I'm provided with is that "It also concluded that the classification of polychaetes into Scolecida, Canalipalpata and Aciculata was useless, as the members of these alleged groups were scattered all over the family tree derived from comparing the 81 taxa.". Is that enough to answer the question?