7047
Saltatory conduction occurs widely in the myelinated nerve fibers of vertebrates , but was later discovered in a pair of medial myelinated giant fibers of " Fenneropenaeus chinensis " and " Marsupenaeus japonicus " shrimp , as well as in a median giant fiber of an earthworm .
 animal: shrimp; animal: earthworm
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 animal: shrimp; animal: earthworm