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#1 2018-09-15 13:08:03

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 1019

I am thinking this is Helina impuncta

Are these photos sufficient to say that this identification is correct?

Thanks

Nigel G.


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#2 2018-09-15 14:45:22

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 762

Re: I am thinking this is Helina impuncta

I can't make out any strong presutural acrostichals, so I'd say depuncta was more likely (but these two can often be difficult to separate in photos).

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#3 2018-09-15 21:14:13

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 1019

Re: I am thinking this is Helina impuncta

Thanks Tony.

This is an area where I struggle simply because the Muscid key often requires a decision on features that may not be visible in any of the photos, even if they are good, and taken in sufficient light. I don't think I tick those boxes anyway.

The key mentions things such as postsutural dorsocentrals, but they seem to vary sometimes. There's not much I can latch on for definite. I see depuncta has a strong posterior bristle on the front tibia, and I can't see one. But I'm not sure whether it's because it is there and the movement/lighting combination makes that not possible, or it isn't there anyway. I can sort of see the arista in one image, but it's difficult to judge the width that well.

This is a long-winded way of saying "I give up"! (though I agree it's probably not H. impuncta)

Nigel

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#4 2018-09-15 23:16:58

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 762

Re: I am thinking this is Helina impuncta

I think we're all learning about identifying stuff from photos - and no doubt the muscid experts would have an opinion on this one. A frontal view (not always possible, I know) would probably help, though not as much as a specimen. In the end, there will always be some that we cannot positively identify - of course that applies to a few specimens too!  big_smile

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