Blue Sea Dragon and Blue Button

Why in News?

• These deep-sea creatures could get pushed to shore sometimes due to a storm or some oceanic conditions.
• The recently-hit Cyclone Michaung would be the reason why Blue Sea Dragons and Blue Buttons were thrown off the Chennai coast. 

About Blue Sea Dragon

• Also known as the blue angel and blue sea slug, the Blue Sea Dragon is a unique underwater creature that has the ability to camouflage.
• Scientific Name: Glaucus atlanticus
• It is a sea slug, a class of marine organisms that are shell-less molluscs with a wide range of colours and shapes. 
• Distribution: Mostly found throughout the Atlantic, Pacific, and Indian Oceans in tropical and subtropical waters.
• Often spotted in deep oceans, Blue Sea Dragons would go in groups, which gave them the name 'Blue Fleets'.
• It would store venom that it consumes from other creatures to inject venom on the foreign bodies they come into contact. But the venom isn’t lethal.

About Blue Button

• Blue Buttons, resembling button-like shapes, are not singular organisms but colonies of small predators called hydroids.
• These colonies float “passively” along the ocean, “performing specialised roles– stinging and preying, defending the colony from predators, and producing more of their kind.
• Scientific Name: Porpita porpita
• They are often confused with jellyfish.
• Distribution: Found in the tropical and subtropical waters of the Pacific, Atlantic, and Indian Oceans.
• Blue Button has a blue float made of a flat, circular disc with many gas-filled tubes that keep it afloat. The disc is surrounded by tiny blue tentacles.
• They have a ‘man of war’ mechanism, which means that they use the tentacles like body parts to sting any foreign body that comes into contact to defend themselves.
• Their venom isn’t lethal.

Q1) What is a jellyfish?

Jellyfish are invertebrates that, together with corals, gorgonians and anemones belong to a group called the cnidarians . This animal group has stinging cells which they use both to capture their prey and as a form of defense. Like all members of the phylum, the body parts of a jellyfish radiate from a central axis. Lacking brains, blood, or even hearts, jellyfish are pretty simple critters. They are composed of three layers: an outer layer, called the epidermis; a middle layer made of a thick, elastic, jelly-like substance called mesoglea; and an inner layer, called the gastrodermis.

Source: Venomous Blue Sea Dragon and Blue Button spotted on Chennai beach