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Nature Live

September 2010
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Who doesn't love a good dinosaur event?!  Triceratops, T-Rex, Diplodocus, Stegosaurus....the list goes on.  But have you ever heard of Scelidosaurus, the topic of our event last Sunday??

 

I certainly hadn't until I met Palaeontology Curator Tim Ewin.  Scelidosaurus was the first whole dinosaur ever to be discovered (before that, only parts of dinosaurs had been found, and no-one had discovered any skulls)....and what's more, it was found right here in England, along the coast at Lyme Regis.

 

 

Scelidosaurus wasn't a massive dinosaur, diplodocus and the like were all ALOT bigger, but it had some fantastic armour plating which may have helped protect it from predators but also may have acted as a form of display, to deter opponents or attract a mate.

 

 

But what's so special about the Scelidosaur remains in Lyme Regis (which are continually being discovered as the cliffs slowly erode) is their quality.  The fossils have been brilliantly preserved and scientists are able to study the bodies of these animals in great detail, including their skin which remarkably has also been fossilised.  

 

 

So next time you're talking about your favourite dinosaur, spare a thought for the often (and wrongly) forgotten Scelidosaurus.  The first whole dinosaur ever to be discovered, found right here on our fair isle and with fossilised skin too - you don't get much better than that!

 

Lower Jurassic2.jpg

 

Scelidosaurus is the dinosaur at the bottom of the picture.  Megalosaurus is at the top.

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Eaten Alive - Live!

Posted by Aoife Sep 7, 2010

Small maggoty larvae eating their way through the caterpillar. Yuck! But that was what happened in Nature Live last Saturday, and we caught it on camera for your..err..enjoyment?

 

 

Gavin Broad, who works in the Entomology Department, came along to open our eyes to the gruesome world of parisitoid wasps. These amazing organisms lay their eggs on or in other insects, and when the larvae emerge from the eggs they feed on their host, chomping their way through the fatty flesh of a caterpillar, or sucking away at the liquid haemolymph of a spider. And all the while they do this, the insect they are feeding on is still alive! It can get even worse for the victims of some parasitoids, as they can also release chemicals into the victim to change its behaviour. The difference between a parasite, which draws its nourishment from a host, and harms but does not kill it, is that parasitoids do eventually kill their hosts, by literally eating them alive.

 

 

They are am amazingly abundant group of organisms, and there are thousands to be found in the UK, literally in your back garden.

To show us just how abundant they are, Gavin brought along some Cabbage White caterpillars that had been munching their way through his prized cabages - one caterpillar was happily sitting on its cabbage leaf, though Gavin pointed out that it may well have little wasp larvae inside it. The second caterpillar was standing guard over a small collection of yellowish cocoons - these were the cocoons of the wasps, Gavin explained. The day before the event, the larvae had all emerged from the caterpillar, and clustered nearby, spinning themselves their protective wrappings in silk, inside which they were beginning the transformation into adult wasps. The caterpillar they came from was still alive, at least for a little while longer.

 

 

There were some brilliant questions from the audience, and no-one seemed to mind just how gory these things can be  (don't worry - there are no parasitoids of humans!) but it got even more disgusting when caterpillar number one, which had seemed okay all through the event, suddenly and all at once sprouted dozens of tiny larvae, which burrowed their way out of its side...on their way to freedom! Not so great for the caterpillar, but a great way of keeping down the numbers of them on your cabbages.