question: What subtypes of polychaetes were useless classifications , according to the 2007 study ?
answer: Scolecida , Canalipalpata and Aciculata
turker_answer: Scolecida , Canalippalpata and Aciculata are the subtypes of polychaetes that were a useless classification according to the 2007 study .
rule-based: Useless classifications , according to the 2007 study were Scolecida , Canalipalpata and Aciculata .