The leaf sheep sea slug (Costasiella kuroshimae) is an absolutely mesmerizing critter of the deep, adorned in vibrant green hues with hints of purple. *photo by Alex Mustard Underwater Photography
Leaf sheep slugs possess a fascinating ability called kleptoplasty. They consume algae and retain the algae's chloroplasts, which are specialized structures responsible for photosynthesis. These chloroplasts allow the slugs to convert light energy into food, supplementing their nutrition. This unique adaptation sets them apart and contributes to their vibrant green coloration. In essence, leaf sheep slugs can perform photosynthesis like plants, blurring the lines between animal and plant life in the ocean.
I love how it looks like an adorable cartoon creature—but it’s real!! 🥰
Listen to me, boy. You will hear about sea slugs. You will enjoy sea slugs
Costasiella kuroshimae / leaf sheep. Discovered off the coast of Japanese island Kuroshima in 1993, they can indirectly perform photosynthesis by absorbing chloroplasts from algae
Cyerce nigricans. The cerata can be easily cast when disturbed. They can also swim by powerfully flapping said cerata when strongly stimulated. I think they look like butterfly wings!
Jorunna parva / sea bunny. They are covered in papillae, which are fleshy protuberances used for sensory functions. It looks like fur!
Glaucus atlanticus / blue glaucus. They are rarely seen, except during periods of on-shore winds which brings them and their prey into coastal waters. They are the most dangerous sea slug to handle, able to give humans a very painful and potentially dangerous sting
Chromodoris lochi / loch's chromodoris. They are spongivores, and prefer being on the underside of overhangs on rocky reefs. Their distribution is widespread in the Indo-Pacific. Everyone I show sea slugs to seems to love this little guy
Dirona albolineata / white-lined dirona. A translucent predator that often eats bryozoans and small snails. They generally reside on rocks and sometimes mud in the intertidal. Pretty little things, they remind me of shards of glass
Phidiana hiltoni / Hilton's Aeolid. They are known for being quite aggressive, often biting and fighting other aeolids, which is so real of them. They always reminded me of lit matches
Acanthodoris lutea / orange-peel doris. Its bright aposamatic colouration is a warning to predators of its distasteful toxicity. They also notably smell of sandalwood! You don't understand. I NEED to hold one
Nembrotha kubaryana / dusky nembrotha. They use the toxins in their prey ascidians to defend themselves against predators. The toxins are stored in their tissues then released in a slimy defensive mucus when alarmed. Nembrotha kubaryana are well-known for their neon appearance
Phyllodesmium poindimiei / Spun Of Light. It's primarily nocturnal and can cast its cerata for protection. Anyway, can we all agree that Spun Of Light is the most awesome name for a sea slug ever? I mean, look at it. That's a sea slug spun of light if I've ever seen one