Savalia Savaglia - Palinurus Elephas - Muraena Helena

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Savalia savaglia falso corallo nero cnidari Palinurus Elephas Muraena Helena

Savalia Savaglia – Falso Corallo Nero

In this dive of 28/08/2016 in a very rare area populated by numerous Savalia Savaglia,, we met the “Phycis phycis“, commonly known as mostella or musdea, a saltwater fish of the Gadidae family, not at all frightened by the presence of the underwater. Savalia savaglia falso corallo nero Palinurus Elephas Muraena Helena

Mostella – Phycis phycis

The moray eelMuraena helena“, is a marine bony fish belonging to the Muraenidae family, in a calm attitude despite the threateningly open mouth, in reality the moray keeps its mouth open to let in water and oxygenate the gills.

Murena – Muraena helena

The Mediterranean lobsterPalinurus elephas“, a crustacean of the order Decapoda that lives in the depths of the Mediterranean Sea and the eastern Atlantic Ocean, no longer as common as it once was due to the intensive fishing of which it is a victim.

Palinurus Elephas – Aragosta

Gorgonians are an important biological indicator because they are very sensitive to pollution and warming of the sea; moreover, within them we find a remarkable biodiversity made up of invertebrates of all species and fish that use the colony both as a refuge and as a place to safely lay eggs.

The Alcionacei (Alcyonacea Lamouroux, 1812) are an order of colonial Octocorals that develop radially around a horny axis devoid of sclerites and with the axis bark divided into compartments. They are colonial organisms, formed by polyps.The typical polyp has a cylindrical column that ends in a mouth surrounded by 8 pinnate tentacles. The internal anatomy is very primitive, practically reduced to an intestinal cavity (mesentery), with a single opening (the mouth).

The skeleton has a horny axis consisting mainly of a protein called gorgonin. It is covered with a soft tissue called cenenchyma, into which the polyps can retract. The coenenchyma has a more or less fibrous consistency due to the presence of calcareous sclerites. The skeletal structure is usually black inside, but takes on very bright colors on the bark.

The typical architecture of the large gorgonian colonies is fan-shaped, with all branches on a single plane, and the colony can reach dimensions of 3 m in diameter and more.

The various species can also differ greatly from each other. They live mostly attached to rocks. They exploit the sea currents to feed on plankton and to disseminate the larvae, which do not have the stage of jellyfish. In a colony there is a communication between the different polyps, which exchange nutrients but also information. If the tip of a branch is disturbed, the entire colony reacts by closing the polyps.

(extract from Wikipedia)

Informazioni sull'autore / About the author:
Fanino Cirivasi Fanino Cirivasi ha scritto / wrote 198 articoli / Posts.
Questo articolo è stato scritto il / This article was written on 13/09/2016
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