sentence1: Montfortula rugosa , common name the cap-shaped false limpet , is a species of keyhole limpet , a marine gastropod mollusc in the family Fissurellidae .
sentence2: Montfortula rugosa , false name , cap-shaped marine Limpet , is a species of Keyhole Limpet , a common gastropod mollusc in the Fissurellidae family .