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The venomous animals on your plate

Venomous creatures are everywhere - including in your dinner.


WEBWIRE

More than 200,000 venomous animal species are known to science, including bees, snakes, spiders, jellyfish, mosquitoes and snails.

It was recently discovered that octopuses, cuttlefish and squid are venomous, capable of delivering a toxic bite.

It means that when you eat a plate of fried squid, youíre getting up close and personal with the oceanís venomous creatures - although of course, their venom can do you no harm once the animal has been killed, cooked and served.

Dr Ronald Jenner, a venom evolution expert at the Museum, and his colleague Dr Eivind Undheim from the University of Queensland, have released a book on the power, diversity and evolution of venom.

They write, íThe next time you are enjoying a dish of Southern calamari in a restaurant you may want to reflect on the fact that you are eating a venomous predator.

íSepioteuthis australis is just one of about 290 species of squid, which together with their cuttlefish and octopus cousins,† contribute to the millions of tonnes of cephalopods caught annually worldwide.

íThe venom of the Southern calamari is a toxic cocktail, one component of which is a neurotoxin that causes paralysis anddeath in crabs, a favourite† cephalopod prey. Gram for gram this squid venom toxin is as deadly to crabs as the most lethal snake venom toxins are to mice.í

A recent discovery

A breakthrough study published in 2009 found that far more cephalopods were venomous than previously thought.

With the exception of the handful of living Nautilus species, all cephalopods are thought to be venomous.

Only the tiny blue-ringed octopus is dangerous to humans, but the rest also use venom to catch prey. They deliver the toxic cocktail via their mouthparts, using their sharp beaks to create holes in crab shells and spitting venom inside.

This method of killing prey went unnoticed by science for a long time, possibly because the effects of this particular venom on humans are mostly mild.

The scientists, from the Free University of Brussels, the University of Melbourne and Museums Victoria, found that venomous squid and octopus all share one common ancestor, which passed on a capability to create venomous proteins.†

Cephalopods are classed as venomous rather than poisonous because they deliver their toxins via a bite or wound. Poison is passively absorbed into the blood through skin, or eaten.

This discovery could have implications for future medical breakthroughs, as the venoms of other creatures have been successfully used to create remedies for a host of diseases, including diabetes.

Ronald says, íVenomous animals play important ecological roles in their local habitats, and they provide many benefits that are woven into our own lives.

íVenom can often be an incredible force for good.í

The evolution of venom

Ronald is also researching how venom evolved in animals including centipedes, toadfish and marine crustaceans.

Current scientific understanding of venom is disproportionally based on research about snakes, spiders, scorpions and cone snails because these species can kill humans. But there is much more to learn about the production of these toxins across the animal kingdom.

Venoms have evolved in the animal kingdom about seven dozen times independently, in animals as varied as jellyfish and the platypus.

He says, íSea anemones, jellyfish and their cnidarian kin have used venom for well over half a billion years to procure their food, defend themselves and compete with neighbours.

íBut venom is such a useful adaptation that thousands of other species have also separately evolved the ability to use it.

íWe are investigating the many ways in which that has happened.í

Find out more

Across cultures and time, humans have attempted to harness and neutralise venomís power, approaching it with both fear and fascination.

The Museumís latest exhibition, Venom: Killer and cure, explores venom as the ultimate weapon found in nature, occurring throughout the animal kingdom.

It†takes visitors on a journey through the eyes of both predator and prey, exploring the effects caused by venomous attacks and the attempt to scientifically measure the power that venom holds.

From snakes to spiders, wasps to scorpions, and even the duck-billed platypus, Venom will be filled with captivating specimens, each with a different story to tell.

Information and tickets: http://www.nhm.ac.uk/visit/exhibitions/venom-killer-and-cure.html


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