4431
Some worms , such as " Echiurus " , can leave the substrate entirely , swimming by use of the proboscis and contractions of the body wall .
 location: Echiurus
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:
 location: Echiurus