The term 'Tiny Marine Animal' can be summarized by the crossword solution 'Rotifer' (7 letters). Rotifers are microscopic aquatic animals that are found in both freshwater and marine environments. They are members of the phylum Rotifera, which is composed of over 2, 000 species. Rotifers are characterized by their ciliated crowns, which they use to capture food particles from the water. They are an important part of the food chain, providing food for larger animals such as fish and crustaceans.