Month: April 2013

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Egg-cellent!

The Easter weekend has now been and gone but for some inexplicable reason we have all come in to work with eggs on the brain (figuratively speaking that is). We don’t often get to see eggs-amples of eggs in the department as they are not often collected, so whilst we have thousands of specimens of adult insects and even a few jeuvenille ones, we don’t have many eggs.
Which is a bit sad in our opinion, as the eggs themselves tend to be egg-ceedingly interesting and beautiful, often have complex sculpturation or construction and can allow you to egg-stract information regarding species behaviours and habitat use.

So here we present some very egg-citing photographs of some eggs-traordinary insect eggs that we did manage to find in the collections. Eggs-amine them closely and see if you can figure out what sort of insect they belong to- answers will be at the bottom of the post.

insect eggs, photograph, OUMNH, ootheca, mantid
Picture 1: Technically an egg sac or cluster, this weird shape houses a number of individual eggs belonging to what kind of insect?

insect eggs, photograph, OUMNH, ootheca, cockroach, blattodea
Picture 2: Another one containing multiple eggs. Here you can see the individual eggs that are paired up along a central spine. Which kind of insect makes eggs like these?

insect eggs, photograph, OUMNH, butterfly, lepidoptera, hairstreak
Picture 3: Only just visible to the naked eye, this tiny egg proves to be beautifully micro-sculptured once you get close up. This photograph had to be taken using a microscoped with camera attachment just so we could show it off. What kind of insect lays an egg like this though?

insect eggs, photograph, OUMNH, ootheca, cockroach, blattodea
Picture 4: Okay, so we are repeating ourselves now but this egg ‘sac’ was just too egg-sciting not to photograph! The delicate little wave-formation along one edge demonstrates which kind of insects aesthetic tastes?
insect eggs, photograph, OUMNH, hemiptera, belostomatidae
Picture 5: Each of these is an individual egg which has been laid in a neat little cluster by which kind of insect?

Whilst you are musing on your answers for the above five questions here are some even more egg-citing photographs for you to study. These are pictures of some mystery eggs. We know that they probably belong to some kind of decapod. They were found attached to a water beetle that was collected in Mozambique. If anyone reading this has any idea about what the egss might be then we would love to know.

insect eggs, photograph, OUMNH, decapod eggs
Mystery eggs 1: Here you can see that there are small clusters of eggs attached to the underside of the beetle next to it’s coxae.

insect eggs, photograph, OUMNH, decapod eggs
Mystery eggs 2: We had to take the specimen out of alcohol and dry it off to take the pictures so the eggs look very shiny. If you look really closely you can make out little pairs of eyes in each of the eggs.

insect eggs, photograph, OUMNH, decapod eggs
Mystery eggs 3: Here’s a real close-up shot. Are those tiny legs and antennae that we can see?

Egg-shausted by eggs yet? Over egg-cited maybe? Ready to egg-splode from all the egg-stravagent egg puns?

Here are the answers to the above quiz questions:

  1. Mantid ootheca
  2. Cockroach ootheca, in this case belonging to a species of madagascan hissing cockroach
  3. Butterfly egg: Order Lepidoptera, Family Lycaenidae.
  4. Another cockroach ootheca (we warned you it was a repeat)
  5. True bug eggs: Order Hemiptera, Family Belostomatidae. Interesting fact- the males of this family carry the eggs on their backs (the females stick them on there with a water resistent glue) until they hatch.
insect eggs, photograph, OUMNH, hemiptera, Belostomatidae
Egg cluster on the back of a male Belostomatid
That’s all yolks!
No more egg puns until next year- we promise.

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Life and Death in Herculaneum

Fig seeds

At 9pm today BBC2 is broadcasting The Other Pompeii: Life and Death in Herculaneum, a documentary following The Herculaneum Conservation Project, which aims to find out what life was like in the small Roman town of Herculaneum, moments before it was destroyed by the famous eruption of Mount Vesuvius in 79 AD. This project involves work both in the field and in the Museum by our Environmental Archaeology Unit, led by Mark Robinson.

The sewer in Herculaneum
The sewer in Herculaneum

One of the problems faced by the conservators at Herculaneum is that they need to remove rainwater from the site. To this end, a Roman sewer was to be excavated so that it could act as a conduit for new plastic drain pipes. The Museum’s Environmental Archaeology Unit was brought in to investigate the contents of this sewer for evidence of Roman diet. Biological remains from Herculaneum were transferred to the Museum for detailed analysis by Mark and Erica Rowan, a doctoral student in the Environmental Archaeology Unit.

The numerous fish bones, sea urchin fragments and so on suggested that the occupants of the town enjoyed a varied marine diet. There was also evidence of the plant component of their diet, including a major consumption of figs and the use of food flavourings such as coriander and even black pepper, which would have been imported from India. Remains of fly pupae suggest unhygienic conditions.

Sorting in the field at Herculaneum
Sorting in the field at Herculaneum

Look out for more on this research, including footage filmed in the Museum, in the BBC 2 documentary tonight. The programme is being broadcast to coincide with the opening of the Life and Death: Pompeii and Herculaneum exhibition at the British Museum.

Mark Robinson, Head of the Environmental Archaeology Unit

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What’s on the van? – Darwin’s dung beetle

_Beetle-wpin

This week’s What’s on the van? comes from Darren Mann, assistant curator of the Museum’s Hope Entomological Collection

On the 27 December 1831 a young naturalist by the name of Charles Darwin (1809-1882), on a ship by the name of the HMS Beagle, began a five year journey around the world. During this voyage he collected many specimens of plants and animals, which he later dispersed to some of the most eminent scientists of the day.

Of all the insects in this small collection, the beetle Onthophagus australis (Guérin, 1830) is by far my favourite, simply because it’s a dung beetle, which are my favourite insects. I think dung beetles are both beautiful in form and ecologically are extremely interesting.

This very specimen was collected by Darwin during 1836 at Hobart town, Tasmania. At the time, Reverend Frederick William Hope (1797-1862), the British entomologist who founded the Museum’s Hope Entomological Collection, thought the beetle was a new species to science; it had in fact already been described from Port Jackson, Australia by French entomologist Félix Guérin-Méneville (1799-1874). This is a widespread species found in Tasmania and south-western Australia, where it feeds on all sorts of dung.

During Darwin’s early life, Hope was a friend and mentor, and as such Darwin sent some of the Australian insects he collected to Hope for study. Sadly, Hope took ill and retired to Italy, never completing his work on Darwin’s insects.

To date we have found over 130 Darwin specimens in our collections. Some of these have even travelled back to Australia to form part of the temporary exhibition at the National Museum, which celebrates Darwin in Australia.

Darren Mann, Assistant Curator, Hope Entomological Collection

What's on the van?