Please answer the following question: Krachia cylindrata is a species of sea snail a gastropod in the family Cerithiopsidae which is known from European waters. It was described by Jeffreys in 1885. 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?
A:
Animal