9662
Traditionally , based on phenotypic features , acoelomorphs were considered to belong to the phylum Platyhelminthes , which was long seen as the sister group to all other bilaterian phyla .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None