Sea pens are colonial marine cnidarians belonging to the order Pennatulacea. There are 14 families within the order and 35 extant genera; it is estimated that of 450 described species, around 200 are valid. Sea pens have a cosmopolitan distribution, being found in tropical and temperate waters worldwide, as well as from the intertidal to depths of more than 6100 m.Sea pens are grouped with the octocorals, together with sea whips (gorgonians).

I filmed this sea Whip coral during an underwater excursion to Maldives. The Gorgonias are an important biological indicator because they are very sensitive to pollution and sea heating; moreover, inside them we find a remarkable biodiversity composed of invertebrates of every species and of fish that use the colony both as a refuge and as a place to lay eggs safely.

I filmed this Gorgonia Flabellum during an underwater excursion in the Red Sea at a depth of about 30 meters. The Gorgonias are ...

Eunicella verrucosa, the broad sea fan, pink sea fan or warty gorgonian, is a species of colonial Gorgonian "soft coral" in the  Gorgoniidae family ...