If I asked you to name a creature or individual that had the power to remove its limbs on command and then regrow them, you would probably think I was talking about a Marvel superhero or villain! But I’m not! I’m talking about the incredible brittle star (Ophionereis schayeri)!
The name brittle star is given as a testament to the sea star’s superpower of detachable limbs. In the quiet drama of the ocean, the sea star uses this as a survival strategy, an ingenious defence mechanism. When threatened by predatory species, it unveils a surprising move: it detaches the tips of its arms, a daring escape act.
This tiny star sacrificing a part of itself to distract predators is akin to a brave hero. The sacrificed limb continues to wriggle and even emit a green glow, a beacon of defiance in the dark depths. Though losing an arm may seem drastic, the brittle star is a master of resilience, regrowing the lost portion and turning adversity into a triumph of survival. See below how the brittle stars arms grow back!
But the brittle star faces challenges beyond predators. In the changing oceans due to climate change, getting warmer and more acidic, it becomes harder for them to breathe, grow, and repair their bodies. Some may even start to dissolve in the water! This is bad news for them and for the other animals that depend on them for food or shelter.
Luckily, the brittle star is not giving up. They are adapting to the new conditions and finding ways to cope. For example, some of them can change their shape or colour to blend in with their surroundings. Others can move to deeper or cooler waters where they can find more food and less stress. And of course, they can always use their superpower of detachable limbs to escape from danger.
In Australia, the brittle star has many different habitats. They can be found in the rocky shores, the coral reefs, the sandy bottoms, and even the Antarctic waters. Each habitat has its own challenges and opportunities. For example, in the coral reefs, they have to compete with many other colourful and diverse animals for space and food but they also have more protection from predators and greater chances to find mates. In the Antarctic waters, they have to deal with the extreme cold and the long periods of darkness but they have fewer enemies and more food resources.
The brittle star is a fascinating creature that has been living in the ocean for millions of years. They have evolved many survival strategies and tricks to overcome the challenges of their lives. They are brave, resilient, and adaptable. They are also important for the health and balance of the ocean ecosystem. We can learn a lot from them and we should respect and protect them.
Ever wondered why it’s not just called a brittle star but also a snake star?
Well that is due to the enchanting secret of it’s the sea star’s movement.
The name “snake star” originates due to the dance beneath the waves. The sea star does not glide like its counterparts but propels itself with a sinuous grace, arms curling like a snake. Unlike the usual sea star routine, this underwater acrobat uses its arms, not tubular feet, to navigate the ocean floor.
Imagine one arm boldly leading, pointing the way like a seasoned guide, while the next two act as skilled partners, pushing the creature forward with a subtle elegance. The final two arms follow suit, offering silent support in this underwater ballet. Short blunt spines on the arms transform into mystical grips, creating a masterpiece on the sandy canvas.
To get a visual view of the movements described above, have a look at the video below!!
If you would like to learn more about the huge diversity of life that can be found along our coasts and shorelines, please contact our Education Director at education@dolphinresearch.org.au for a public event, school holiday program or school incursion/excursion.
