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Blue spiny starfish Coscinasterias tenuispina Stella marina variabile_intotheblue.it-2025-04-12-20h38m23s818
10
01:48

Blue spiny starfish

Coscinasterias tenuispina, Variable starfish or Spiny starfish is an echinoderm very common in the Mediterranean Sea. It is one of the most common starfish in the "Mare nostrum" and I would also say one of the most fascinating. Usually Echinoderms (sea urchins and starfish) have a pentaray symmetry. This species is indeed variable! ...
Andrea Cirivasi
106
0
Brown Mesh Sea Star – Stella marina Nardoa – Nardoa galatheae – www.intotheblue.it – www.intotheblue.link-2024-01-06-09h22m08s362
15
02:50

Brown Mesh Sea Star

Brown Mesh Sea Star, Nardoa galatheae, is a genus of sea stars in the family Ophidiasteridae. The Ophidiasteridae are a family of sea stars with about 30 genera. Occurring both in the Indo-Pacific and Atlantic Oceans; ophidiasterids are greatest in diversity in the Indo-Pacific.
Stefano
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Biodiversity – Biodiversità – www.intotheblue.it-2025-01-11-15h39m18s489
21
13:24

Biodiversity

We are on an isolated patch of rock and coralligenous about 7.5 miles from the coast; the seabed varies from 49 to 52 meters, the area to explore has a surface area of ​​about a couple of basketball courts (about 600 square meters X 2). All around a sea of ​​mud and a mixture of mud/sand separates us from the main submerged reef 400/500 meters away, always on the bathymetric of 50 meters.
Andrea Cirivasi
94
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Luce del sole intotheblue.it-2024-08-11-11h48m32s861
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14:24

Colours of the Mediterranean Sea

Deep sea has an intense blue color. The light that penetrates the water changes its light intensity and its spectral composition by effect of  selective absorption by water of the different wavelengths that make up the visible spectrum. The ultraviolet and infrared stop the first few centimeters of depth, then extinguished the red, orange, yellow, green and purple and blue that reaches greater depths. ...
Andrea Cirivasi
243
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Variable spiny starfish Coscinasteris s082
19
03:12

Variable spiny starfish

The Variable spiny starfish (Coscinasterias tenuispina) is called this because instead of the classic five arms it usually has seven. It is therefore an exception regarding the classic five-ray symmetry of echinoderms. Furthermore, as can be seen in this specimen, three of the seven arms are very small and are therefore slowly growing back. ...
netartstudio
273
0
Red starfish Echinaster sepositus-16h58m11s527
12
02:25

Red starfish

Finding a starfish is one of the first experiences a diver can have, especially the Red starfish - Echinaster sepositus - one of the many species among the most common in the Mediterranean Sea. It is one of the first encounters, but even the most experienced divers always find this species of echinoderm fascinating. However, when they meet, some precautions must be taken to avoid causing damage to these splendid starfish. Surely picking them up with some care, handling them and forcibly removing them from the substrate on which they are located can lead to damage ...
netartstudio
810
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Spiny starfish Stella marina spinosa-2023-07-17-17h28m41s252
15
06:50

Spiny starfish Martasteria

Martasteria or Thorny starfish (Marthasterias glacialis Linnaeus, 1758) is one of the most common starfish in the Mediterranean Sea, it is an echinoderm of the Asteriidae family. In this video we see it lying on a cliff that varies from 41 to 49 meters deep, rich in red Gorgonians of the Paramuricea clavata species and the classic yellow sponges of the Verongia species, therefore a guaranteed show of colors at the expense, however, of the visibility of the water about two or three meters. ...
netartstudio
233
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vlcsnap-2022-03-16-11h16m43s348
15
04:37

Spiny Starfish - Tank Star

The Martasteria or Spiny Starfish, Marthasterias glacialis, is an echinoderm of the Asteriidae family common in the Mediterranean Sea. Also called a Tank star, due to the characteristic plates bristling with thorns that distinguish it from other starfish, it has a regular shape with five arms. The body is characterized by spines of variable color: white, gray, brown, red, blue. It appears to be the largest species in the Mediterranean, capable of reaching even 85 centimeters in diameter.
Fanino Cirivasi
175
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vlcsnap-2021-11-03-12h10m05s880
27
04:39

Purple Starfish

The Purple Starfish, is a species of starfish from the East Atlantic (from mainland Portugal and the Azores down to the Gulf of Guinea) and the Mediterranean Sea. It has a big variation in colour (from red to orange) and may present brown spots. The central disc is small, covered by irregular plates, and the arms are thinner near the central disc. Each arm has lines of respiratory papillae. It can reach 40 cm in diameter.
Stefano
321
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vlcsnap-2021-01-15-11h56m24s577
21
03:11

Basket Star

The Basket Star is characterized by five tentacles, each branched several times, with which it clings to the branches of the soft corals and which are opened at night to feed on. The body has a diameter that can reach 8 centimeters, with the complete opening of the tentacles the maximum width of the entire animal can reach 80 centimeters. It feeds passively with the open tentacles, in particular of planktonic microparticles.
Fanino Cirivasi
294
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vlcsnap-2021-11-05-20h51m36s915_T
10
11:11

Sea urchin reproduction

Also this summer we met some sea urchins all piled in one place. We therefore think we have filmed again the reproduction of  Sphaerechinus granularis. Like other echinoderms, sea urchins reproduce in the summer ...
Andrea Cirivasi
365
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Missing Island L’Isola mancata www.intotheblue.it-2021-08-17-11h04m06s568
20
17:02

Missing Island

Missing Island is a shoal halfway between the Island of Gorgona and Livorno. The shoal has two summits a couple of miles apart which rise to a depth of about 36 and 46 meters, from a depth of 80 meters on the side of Livorno and over 120 meters on the side of the Island of Gorgona ...
Andrea Cirivasi
241
0
vlcsnap-2021-02-15-16h17m40s823
23
05:16

Invasion of Stylocidaris affinis

I did the underwater video in a stretch of sea between Livorno and the island of Gorgona at a depth of over 50 meters. I was surprised to meet so many sea urchins, known as Stylocidaris affinis, concentrated in a short stretch of cliff. Frankly, I wondered why so many sea urchins had colonized those rocks?
Fanino Cirivasi
139
0
vlcsnap-2019-04-24-14h29m15s330
24
00:58

Star red of Mediterranean sea

The Star red of Mediterranean sea, Echinaster sepositus, is a species of starfish from the East Atlantic, including the Mediterranean Sea. Echinaster sepositus has five relatively slender arms around a small central disc. It usually has a diameter of up to 20 cm, but can exceptionally reach up to 30 cm.
Fanino Cirivasi
588
vlcsnap-2019-11-08-11h17m21s225
12
01:19

Purple sea Urchin

The Sphaerechinus granularis is a species of sea urchin in the family Toxopneustidae, commonly known as the purple sea urchin. Its range includes the Mediterranea Sea and eastern Atlantic Ocean. Echinoderm is the common name given to any member of the philum Echinodermata  of  marine animals.
Fanino Cirivasi
236
Medusa mediterranea Rhizostoma pulmo – Polmone di mare – Big mediterranean barrel jellyfish – www.intotheblue.it-2024-01-31-15h09m09s191
0

Symmetry and marine organisms

Symmetry in biology is the balanced distribution of duplicate body parts or shapes within the body of an organism. In nature and biology, symmetry is always approximate. Symmetry creates a class of patterns in nature, where the quasi-repetition of the pattern element is of reflection or rotation.
Andrea Cirivasi
1.11K
vlcsnap-2020-05-13-18h07m38s589
20
02:07

Blue spiny starfish

Coscinasterias tenuispina is a starfish in the family Asteriidae. It is sometimes called the Blue spiny starfish or the white starfish. It occurs in shallow waters in the Atlantic Ocean and the Mediterranean Sea. Coscinasterias tenuispina has from 6 to 12 arms (usually 7), often of varying lengths, and grows to 20 cm. in diameter.
Fanino Cirivasi
673
Carlo-Terreni-dorsale-fuori-Livorno-1024×576
12
02:48

Ridge outside Livorno

We are in a stretch of sea between Livorno and the island of Gorgona, off the island of Gorgona at a depth of between -62m. -67m. The seabed is typical of the Mediterranean Sea at high depths (even if there are no Gorgonians) we see a rocky wall full of life
Carlo Terreni
237
La Stella Gorgone – The Basket Star – Astrospartus mediterraneus – intotheblue.it – vlcsnap-2019-11-27-10h10m19s383
8
01:53

Basket Star

The Basket Star is characterized by five tentacles, each branched several times, with which it clings to the branches of the soft corals and which are opened at night to feed on.
Fanino Cirivasi
852
La Stella Serpentina Liscia – The Brittle Starfish – Ophiodermatidae – intotheblue.it – vlcsnap-2019-10-19-17h04m28s512
11
01:26

Brittle Starfish

The brittle starfish is present throughout the Mediterranean Sea and generally lives hidden in the crevices of the cliffs or sheltered under rocks or debris present in the sea. We find it with great ease starting from the surface up to the depth of a hundred meters.
Fanino Cirivasi
3.12K
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