Secret life of starfish

Dr Liam Herringshaw (Canada) In every sea, in every ocean,Beasts of freakish locomotionProwl the substrate, seeking preyTo feast on in a monstrous way. Dinner is served. On a plate before you, there is a delicious roast chicken. However, the bird is larger than your head and you have no hands or teeth you can break it up with, let alone a knife and fork to use. How are you going to eat it? Are you going to push one half of your stomach out through your mouth, smothering the chicken in digestive juices to dissolve it, then haul your stomach back into place, slurping up the nutritious broth as you go? No? Well you are obviously not a starfish! Members of the class Asteroidea, to give them their proper name, are among the most familiar of all sea creatures, the five-fingered favourites of many a seaside publicity brochure. Yet, even a cursory investigation of their biology, ecology and evolutionary history reveals the familiarity to be a deception. These icons of the intertidal are about as strange as life on Earth gets. If their feeding habits weren’t weird enough, asteroids have a skeleton made of crystals, possess extraordinary powers of regeneration and move around on a system of tiny hydraulic tentacles. And they don’t even have a brain. What they do have is membership of an exclusive club: the Echinodermata or ‘hedgehog-skins’. If you have ever seen footage of crown-of-thorns sea stars chomping their way across the Great Barrier Reef, you … Read More

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