Bluestriped Light Bulb Tunicate

Overview

The bluestriped light bulb tunicate (Clavelina dellavallei) is a colonial ascidian characterized by its striking transparency and delicate, bell-like appearance. These marine organisms are typically found in clusters or small bouquets, with individual zooids connected by a common basal stolon.

Appearance

Each zooid can reach up to 3 cm in height, with the entire colony sometimes forming larger groupings. The body is highly transparent, revealing internal organs that often appear as a violet-colored mass at the base. A key diagnostic feature is the presence of a fine, blue-violet vertical line running along the endostyle, complemented by light yellow or white circular markings that highlight the branchial gill slits. The two siphons are prominent, positioned close together at the top of the body, and may feature subtle white or blue-violet pigmentation.

Distribution & Habitat

This species is primarily found in the Mediterranean Sea and the temperate waters of the nearby Atlantic Ocean, including areas around Madeira and the Canary Islands. It prefers hard substrates such as rocky reefs, coralligenous formations, gorgonians, and occasionally algae. While it can be found from shallow waters, it is most commonly observed at depths between 10 and 90 meters.