Filograna implexa (Salmacina incrustans) is a marine species of tubular worm belonging to the class of sedentary Polychaeta of the Serpulidae family. This species is found in the waters of the Mediterranean Sea, the English Channel, the North Sea, the Gulf of Mexico and off the coast of Monzambique, and from South Africa to New Zealand.

During an underwater dive in a submerged reef completely colonized by gorgonians of Paramuricea clavata, I came across Filograna implexa. I was at a depth of between 61 and 65 meters. ...