Didemnum fulgens

Didemnum fulgens is a sessile species found in temperate and subtropical waters, particularly in the Atlantic and the Mediterranean regions, including the UK and France. This species typically inhabits depths shallower than 40 meters, with most occurrences recorded at depths of around 30 meters or less. It is often found on hard substrates, making it a common sight in various marine environments. Its appearance can be distinguished from similar species by its colonial structure and coloration, although specific visual characteristics are not detailed in the sources. As a hermaphroditic organism, Didemnum fulgens reproduces through both cross- and self-fertilization. The life cycle begins with eggs that develop into lecithotrophic larvae, which then metamorphose into benthic adults. This reproductive strategy allows for flexibility in population dynamics, especially in varying environmental conditions. Encounters with Didemnum fulgens during dives can be intriguing, as divers may observe its colonial formations on surfaces. The species does not pose any threat to humans and is not currently evaluated for conservation status. Observations suggest it is relatively widespread, although specific information on its population density is not provided.