Ascidie Rose

Overview

Ascidia mentula is a large, solitary sea squirt commonly found attached to solid surfaces in marine environments. It is recognized by its thick, cartilaginous, and often translucent body, which typically displays shades of pink, red, or olive green depending on light exposure.

Appearance

This species has an elongate, flask-shaped body that can grow up to 18 cm in length. The outer covering, or tunic, is leathery and often features irregular, rounded swellings. It possesses two inconspicuous siphons: the oral siphon is located at the tip and surrounded by small, white-tipped lobes, while the atrial siphon is positioned further down the body. In deeper or more silty waters, the animal may appear grey, though it often retains tiny red or pink spots.

Distribution & habitat

Ascidia mentula is widely distributed across the Northeast Atlantic, the Mediterranean Sea, and the Black Sea. It is frequently found attached to rocky substrates, including vertical faces, crevices, wrecks, and large shells, ranging from the lower shore down to significant depths.

Biology & behavior

Unlike many other ascidians that attach at their base, this species typically adheres to the substrate on its left side. It is a relatively long-lived tunicate, with some individuals surviving for several years. As a filter feeder, it draws in water through its oral siphon to extract organic particles and microorganisms. It is also a subject of interest in developmental biology due to its larval characteristics, which share evolutionary links with vertebrates.