DavidHowdon's picture

Purple beetle

Observed: 27th April 2012 By: DavidHowdon
Amateur Entomologists' SocietyLondon Natural History SocietySelborne Society
DavidHowdon’s reputation in InvertebratesDavidHowdon’s reputation in InvertebratesDavidHowdon’s reputation in InvertebratesDavidHowdon’s reputation in InvertebratesDavidHowdon’s reputation in Invertebrates
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Description:

These beetles had a lovely purple sheen. Approximately 10mm in length (but not accurately measured)

Identifications
Species interactions

No interactions present.

Species with which Lesser Bloody-Nosed Beetle (Timarcha goettingensis) interacts

Comments

chrisbrooks's picture

Size

David, what size in mm were they please, I'm not sure I can gauge it from the finger or thumb in the image.

DavidHowdon's picture

10 mm or thereabouts

Have added it to the text above.

Nick Upton's picture

Chrysolina or Timarcha

Do you know how to confidently separate Chrysolina spp. from the Lesser Bloody-nosed beetle Timarcha goettingensis? I've been finding beetles quite similar to yours (maybe more blue than purple) on a south facing pastureland hill in Wiltshire quite regularly and have tended towards T.g... but the lack of confirmation/comment on this site suggests they're tricky! See http://www.ispot.org.uk/node/256816 and http://www.ispot.org.uk/node/254654

The one I picked up did produce a reddish droplet, as Bloody nosed beetles do.

Nick Upton, naturalist and photographer.

DavidHowdon's picture

Timarcha tenebricosa

Thanks for the ID John. What features should I have been looking at if I had wanted to get it right myself?

John Bratton's picture

I don't know what character

I don't know what character the key uses (I'm not at home), but I think Chrysolina and Chrysomela have clearly punctured elytra.

Nick Upton's picture

Which Timarcha?

Thanks for that John, but I'd also be intrigued to know what makes this beetle T. tenebricosa rather than the smaller T. goettingensis which the small size of this and the quite dimpled elytra might possibly suggest? I gave a link earlier in this string to some photos I've taken recently of some 8mm beetles "similar" to the ones Daveid posted here (blue sheen more than purple on mine), which to me fit goettingensis much better than tenebricosa, but I don't claim to be an expert and don't have keys to work from for this group.

Nick Upton, naturalist and photographer.

DavidHowdon's picture

Revised ID

Perhaps you should add a revised ID.

Eskling's picture

Size Matters

I have only ever seen T. tenebricosa and they were probably about twice the size of the ones in the pictures above.

John Bratton's picture

I think you are right. The

I think you are right. The pronotum doesn't look so narrowed to the base as I first thought.

Nick Upton's picture

Lesser B-N B

Many thanks for your feedback on this John...

Nick Upton, naturalist and photographer.

John Bratton's picture

If one of you would like to

If one of you would like to put goettingensis in as a revison, I'll agree with it. I don't feel I should claim the points.

John

DavidHowdon's picture

Nick's done it

As is right since he was the one who correctly identified it.

Similarly I'd not add the correct ID myself in these circumstances since it was only through the iSpot comments that I found out what it was.

Nick Upton's picture

T. goettingensis

OK, its done, thanks. And if you had a chance to look at this other recent posting which I'm pretty sure is also of T. goettingensis, Jen who posted it might be grateful. http://www.ispot.org.uk/node/255411

Nick Upton, naturalist and photographer.

Nick Upton's picture

iSpot

It's a good system and a really useful site. I like to get confirmations of IDs I make on photos I take, and when I have really no idea, someone usually knows what it is or helps get me part way there!

Nick Upton, naturalist and photographer.