[eng] The work on the general state and biometrics of two species of marine gastropods is shown: Patella rustica (Linnaeus, 1758) and Phorcus turbinatus (Born, 1778), on the island of Cabrera and comparing in a series of spaces in Mallorca. The results of the comparison between the localized species of both species have some common points, but most are divergent. In this sense, rather than making clear conclusions, new questions have been posed possibly related to the warming of seawater due to climate change, such as the apparent absence or low presence of P. rustica specimens in Cabrera.