Question: The Lower-Middle Cambrian animal Rhabdotubus is the earliest known pterobranch. which bears strong similarity to the graptolites - indeed for some time it was misclassified as a dendroid graptolite. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Animal