Mediterranean Slipper Lobster

Overview

The Mediterranean Slipper Lobster is a large, benthic crustacean easily recognized by its flattened, shield-like antennae and lack of true claws. It is primarily found in the Mediterranean Sea and the eastern Atlantic Ocean, where it inhabits rocky and sandy seafloors.

Appearance

This species features a robust, reddish-brown to blue-grey carapace with rust-colored stippling, providing excellent camouflage against rocky substrates. Its most distinct feature is the pair of enlarged, flattened second antennae that extend forward like plates. Adults lack claws and can reach lengths of up to 45–50 cm, though they are more commonly observed at smaller sizes. To further enhance their concealment, individuals may occasionally carry small algae or invertebrates on their shells.

Biology & Behavior

Primarily nocturnal, these lobsters spend their daylight hours sheltering in caves, crevices, or under rocky ledges, often exhibiting gregarious behavior by sharing dens with others. They are slow-moving but capable of rapid escape using a "burst-and-coast" swimming pattern, achieved by powerful, rhythmic flexions of the abdomen. When threatened, they rely on their strong grip to cling to the substrate or use their tail-flipping movement to retreat.

Feeding

As specialized predators, they forage at night for mollusks, with a particular preference for limpets and bivalves. They use their specialized legs to manipulate and open these shells. When competing for food, individuals may use their flattened antennae to flip opponents or engage in physical contests to secure their meal.