It is called Percnon gibbesi. It is an "alien" crustacean spotted in the Mediterranean, for the first time in 2009, in Linosa, but probably already present ...

In this video we can see how animals of different species can live in symbiosis. The relationship between Anemone and Paguro  is well known ...

It is probably the glass Ctenophore or Bolinopsis vitrea and its host: a transparent Shrimp perhaps from the Phronima sedentaria or in any case a crustacean belonging to the Phronimidae family. ...

Palinurus elephas is a spiny lobster, which is commonly caught in the Mediterranean Sea. Is a common species of spiny lobster ...

Often while snorkelling it happens to find some shells and in the Mediterranean it is easy to meet the Murex shell only that we do not always find the mollusk inside, Murex trunculus or Hexaplex trunculus, but the classic Hermit crab which has appropriated a bigger, more beautiful but above all safer house.  We have probably found the Clibanarius erythropus, red-legged hermit crab, devil hermit crab or coast hermit crab, one of the most common hermit crabs in the Mediterranean but rarely of such dimensions as to be able to easily drag a shell like that of the Murex. ...

Eriphia verrucosa (Forskål, 1775),  warty crab or yellow crab is a species of crab, found in the Black Sea, Mediterranean Sea and eastern Atlantic Ocean from Brittany to Mauritania and the Azores. Individual crabs have been caught as far north as Cornwall. ...