Bryozoaire Encroûtant Noir

Overview

Reptadeonella violacea is a colonial bryozoan known for its distinct, dark-colored encrusting growth form. It is one of the few encrusting bryozoans that can be readily identified in the field due to its specific coloration and preference for well-lit environments.

Appearance

This species forms thin, flat, and hard plates that range in color from brown to deep violet or black. Colonies can reach approximately 10 cm in diameter, though they often appear as a mosaic of multiple smaller colonies that together may cover significant surface areas. The edges of the colony are typically beige, marking the active growth zone where new zooids are formed. Under close inspection, the surface exhibits a fine, granular texture.

Distribution & habitat

Reptadeonella violacea is found in various marine regions, including the Mediterranean Sea and the Northeast Atlantic, such as the English Channel. It is typically observed on rocky substrates and is known to inhabit areas exposed to light, including dimly lit rocky walls and sometimes coarse, sandy bottoms.

Feeding

Like other bryozoans, this species is a suspension feeder. It captures microscopic food particles, such as diatoms and other unicellular algae, from the surrounding water column using its lophophore.