I saw about twenty of these free swimming individuals in shallow waters and I presume them to be newly hatched squid. The most common local species is Loligo vulgaris. Their method of locomotion (shown in a video at https://vimeo.com/128562599) is a sort of backwards wriggle somewhat reminiscent of someone trying to squirm down into a duvet with their hands behind their backs. If anyone has any experience with Mediterranean squid I''d love to know more about their lives.
Hiding under rock
Can change colors and camouflage itself to look like a leaf
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα (kephalópoda); "head-feet"). These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishermen sometimes call them inkfish, referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.