Nomad Diving School

Nomad Diving School 📍Greece, Neos Marmaras
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•Thuridilla hopei• sea slug This sea slug is known as Hope’s Elysia.These gastropods are native to the Mediterranean Se...
07/06/2026

•Thuridilla hopei• sea slug

This sea slug is known as Hope’s Elysia.

These gastropods are native to the Mediterranean Sea and typically measure around 2 centimeters in length.

They are herbivores that feed on specific types of green or brown algae.

They are easily identified by their bright blue, orange, and white striped pattern and long, smooth body.

•Flabellina affinis• Nudibranch Appearance: It has a translucent violet to bright purple body that can grow up to 50 mm ...
07/06/2026

•Flabellina affinis• Nudibranch

Appearance: It has a translucent violet to bright purple body that can grow up to 50 mm in length.

Cerata: The finger-like projections on its back, called cerata, are used for both respiration and defense. In F. affinis, these cerata typically have a striking opaque purple band just below a clean white tip, which distinguishes it from very similar species like Flabellina ischitana.

Sensory Organs: It features two pairs of tentacles on its head: long oral tentacles for sensing the environment and wrinkled, ear-like rhinophores used for detecting chemical scents (smell) in the water.

Diet: It feeds primarily on hydroids, specifically those in the genus Eudendrium.

Unique Defense: Remarkably, these slugs can ingest stinging cells (nematocysts) from their hydroid prey without being harmed. They store these cells in the tips of their cerata to use as a defensive weapon against predators.

Warning Coloration: Its vibrant purple hue serves as aposematism, a warning to potential predators that it may be toxic or distasteful.

Location: It is widely distributed throughout the Mediterranean Sea and parts of the eastern Atlantic Ocean, including the coasts of Portugal and the Canary Islands.

Environment: They typically inhabit rocky reefs and seagrass meadows at depths ranging from shallow waters down to about 50 meters.

•black-faced blenny•• Unique Fins: They belong to the “triplefin blenny” family, meaning their dorsal fin is divided int...
19/05/2026

•black-faced blenny•

• Unique Fins: They belong to the “triplefin blenny” family, meaning their dorsal fin is divided into three distinct sections.

• Gender Differences: While the male in your image is vibrant yellow and black, females are much more cryptically colored (often mottled or brown) to blend into the seabed.

• Habitat: They are commonly found in the Mediterranean Sea and eastern Atlantic, often hiding in shaded areas like rock faces and overhanging cliffs

• The Dance: To attract females, males perform an elaborate “figure-of-eight” swimming dance.

• A Tiny Triplefin: Its genus name, Tripterygion, literally means “three-wing” or “three-fin” because its dorsal fin is split into three distinct sections.

•Cuttlefish•• W-Shaped Pupils: Their unique eye shape (visible in your image) helps balance uneven light fields from abo...
17/05/2026

•Cuttlefish•

• W-Shaped Pupils: Their unique eye shape (visible in your image) helps balance uneven light fields from above and below, providing high-contrast vision even in flickering light.

• Polarized Sight: They are colorblind but can perceive the polarization of light, allowing them to see hidden prey that might be invisible to humans.

• Blind Spots: Unlike humans, their optic nerves attach to the back of the retina, meaning they have a completely continuous field of vision.

• Rapid Transformation: They can change their skin color, pattern, and even physical texture in less than a second to blend into sand, rocks, or seaweed.

• Displays: During breeding season, males display intense black and white “zebra” patterns to attract mates or ward off rivals.

• Invisibility Cloak: They use specialized cells called leucophores to scatter light and match the exact intensity of their surroundings.

• the marshmallow test: Cuttlefish have passed versions of the famous “marshmallow test” for children, showing they can resist an immediate snack if they know a better one (like a live shrimp) is coming later.

• Larger Brains: They have one of the highest brain-to-body size ratios of all invertebrates.Counting Skills: Research shows they can distinguish between different quantities and even “count” to identify where more food is located.

• Blue Blood: Their blood is blue because it uses a copper-based protein (hemocyanin) to carry oxygen instead of iron.

• Three Hearts: They have two hearts dedicated just to pumping blood to their gills and a third for the rest of their body.Internal Buoyancy: They possess a cuttlebone a porous, chalky internal shell that they fill with gas to float or sink at will

•triplefin blenny•• Distinctive Dorsal Fins: These fish are named for their three distinct dorsal fins, although this ca...
17/05/2026

•triplefin blenny•

• Distinctive Dorsal Fins: These fish are named for their three distinct dorsal fins, although this can be hard to see in a single photo.

• Coloration: Males typically have bright yellow bodies and black heads during the breeding season, while females are more cryptically colored with spots and patches.

• Habitat: They are found in shallow coastal waters, usually living on rocky bottoms or in small caves and under overhangs.Size: They are quite small, typically reaching a maximum length of around 4 centimeters

• Three-Part Dorsal Fin: As their name suggests, they are easily recognized by a dorsal fin that is divided into three distinct sections.

• A “Zig-Zag” Dance: During the breeding season, males perform an elaborate “zig-zag” courtship dance with all their fins fully deployed and their heads moving rapidly up and down to attract females.

• Stay-at-Home Dads: After females lay eggs in a male’s territory, it is the male who guards and takes care of the eggs until they hatch.

• Territorial Mood Rings: Male black-faced blennies can change their head color during territorial fights. A head turning grey is a sign of aggression toward an opponent.

• Tiny Titans: Most species are quite small, often measuring only 3 to 6 cm (about 1–2 inches) in length.

• Sticky Eggs: Their eggs are covered in sticky threads that help anchor them to algae or sponges in the male’s nesting site.

•Key Identification Features•• Distinctive Head Markings: Its head is covered in narrow, wavy blue lines and red blotche...
17/05/2026

•Key Identification Features•

• Distinctive Head Markings: Its head is covered in narrow, wavy blue lines and red blotches that resemble ancient script or Arabic calligraphy, which is how it earned its species name “scriba”.

• Body Pattern: It typically has 5–7 dark brown vertical bars on its flanks

• Blue Spot: A prominent, diffuse purplish-blue blotch is usually visible in the middle of its body.

• Coloration: The overall body color can range from grey to reddish, and it often has pale yellow pelvic and pectoral fins.

Habitat & Behavior

• Found in the Mediterranean Sea, the Black Sea, and the eastern Atlantic Ocean from the Bay of Biscay down to Mauritania.

• Environment: They prefer rocky bottoms and seagrass beds (such as Posidonia) at depths of 5 to 150 meters.

• Diet: These are territorial ambush predators that feed on small fish, crustaceans, cephalopods, and worms.

• Unique Biology: They are simultaneous hermaphrodites, meaning each individual possesses both male and female reproductive organs.

•yellow umbrella slug•• Appearance: They have a bright yellow body and a limpet-like shell on their back that is compose...
17/05/2026

•yellow umbrella slug•

• Appearance: They have a bright yellow body and a limpet-like shell on their back that is composed primarily of protein rather than calcium carbonate.

• Diet: These slugs are dietary specialists that feed exclusively on sponges, particularly those in the Aplysina genus, from which they derive their yellow pigment.

• Habitat: They are found in the Mediterranean Sea and Adriatic Sea, often at depths between 0 and 15 meters.

• Protein Shells: Unlike most snails that have calcium carbonate shells, the “umbrella” shell on this slug’s back is composed primarily of protein. This shell is typically small compared to their body size.

• Unique Senses: They have large, enrolled head tentacles called rhinophores. These are sensory organs that allow them to “smell” chemical particles in the water, helping them locate food and mates.

• Biological Superpowers: Some species in this family can incorporate toxins from the sponges they eat into their own bodies for defense. Tiny glands or sacs on their body may store these defensive chemicals.

• Hermaphrodites: Like many sea slugs, they are hermaphrodites, possessing both male and female reproductive systems. This allows any two individuals that meet to reproduce

• Felimare picta • • A Growing Palette: They aren’t born this colorful. Young specimens start as dark blue or black with...
17/05/2026

• Felimare picta •

• A Growing Palette: They aren’t born this colorful. Young specimens start as dark blue or black with three simple yellow lines. As they age, these lines break apart into the intricate spots and complex patterns you see, making every individual unique.

• Giant of the Mediterranean: While most nudibranchs are just a few centimeters long, Felimare picta is one of the largest in its family, sometimes reaching lengths of up to 20 cm (about 8 inches).

• Sensory “Horns”: The two blue-violet horns on its head are called rhinophores. These aren’t ears or eyes; they are highly sensitive “scent” organs that allow the slug to “taste” chemical signals in the water to find food or mates.

Survival & Diet

• Toxic Recycling: These slugs feed almost exclusively on certain marine sponges. They are able to absorb the toxic chemical defenses from the sponges they eat and store them in their own mantle to use against predators.

• Warning Colors: Their brilliant yellow-on-blue pattern is a form of aposematism—a visual warning to predators that they are toxic or foul-tasting.

• ”Naked Gills”: The feathery plume at the tail end is actually its gills. They sit completely exposed on the outside of its body, which is how the species earned the “naked gills”

• True Hermaphrodites: Every individual possesses both male and female reproductive organs. This means any adult it encounters is a potential mate.A “

• Right-Handed” Body: Slugs have asymmetrical bodies; their breathing pore and many major organs are oriented primarily toward the right side

•Common octopus• • Eyes: The octopus has prominent, highly developed eyes with red-colored pupils, which are used to nav...
03/05/2026

•Common octopus•

• Eyes: The octopus has prominent, highly developed eyes with red-colored pupils, which are used to navigate and hunt in marine environments. 

• Habitat: Common octopuses are found in the eastern Atlantic, Mediterranean Sea, and Black Sea, typically hiding in rocky crevices or dens. 

• Intelligence: They are among the most intelligent of all octopus species, capable of complex behaviors. 

• Camouflage: The skin texture around the eyes is textured and mottled, helping the octopus blend in with its surroundings for protection and hunting. 

• Colorblind Vision: Despite their expert camouflage, octopuses are believed to be colorblind. They may perceive color through chromatic aberration, using their uniquely shaped pupils to split light into different colors.

• Defense Tactics: When threatened, they can release a cloud of ink that obscures a predator’s view and contains compounds that can irritate eyes and temporarily paralyze the predator’s sense of smell and taste.

• Triple-Hearted and Blue-Blooded: Octopuses have three hearts. Two pump blood to the gills, while the third circulates it to the rest of the body. Their blood is blue because it uses a copper-rich protein called hemocyanin to transport oxygen, which is more efficient in cold, low-oxygen environments than human hemoglobin.

By vivi michel 📸

Εθελοντικος Καθαρισμος Λιμενα Νεου Μαρμαρά04 - 10 -2025 10:00πμΣυμμετοχη Πληροφορίες - +306976904453Voluntary Cleani...
17/09/2025

Εθελοντικος Καθαρισμος Λιμενα Νεου Μαρμαρά
04 - 10 -2025 10:00πμ
Συμμετοχη Πληροφορίες - +306976904453

Voluntary Cleaning of Neos Marmaras Port
04 - 10 - 2025 10:00 AM
Participation & Information: +306976904453

Diving School - Neos Marmaras

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Nomad Diving School
Néos Marmarás
63081

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