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Chrysomelid - Brachypnoea clypealis

Chrysomelid - Brachypnoea clypealis
1 mi W of Greenfield, Hancock County, Indiana, USA
July 21, 2002
Size: ~ 3 mm
I believe this is Nodon*ta trist*is (Olivier).

EDIT: This is actually B. clypealis.

Images of this individual: tag all
Chrysomelid - Brachypnoea clypealis Chrysomelid - Brachypnoea clypealis

Moved from Brachypnoea.

Finally added some better shots.

Back to guide.


Will frass
Frassing due to misidentification. Will repost with better shots of identifying characters.

The problem with frassing this is that you
(and all of us) will lose all these comments which have been posted here. If you agree that this string of comments is important to save, instead of frassing this, you can EDIT it and click on BROWSE to upload a new image when you have it. That way you get to keep all the comments and have your new image too!!

don´t frass
I agree. Don´t frass...It´s important to learn from the mistakes your making. I know I make mistake, we all do. But I´d like read back the comments and see why. I look forward to your aditional pictures too. I still think this is tristis for now.

Ok, thanks.
Thanks for your positive suggestions. I'll leave at genus level for now and will replace the images sometime (soon hopefully).

Moved from Beetles.

Brachyphnoea tristis
This can be moved to Brachyphnoea tristsis in Eumolpinae
see earlier comments

Brachypnoea tristis
further confimation on B. tristis from a key to the species of Alabama:
lateral margin of pronotum strongly rounded to base, pronotum widest at basal third..... B. tristis
also there is are pictures of Brachypnoea tristis and pucticollis from Cedar Creek on the net also indicating the species is tristis

Ok, here is how I got to N. tristis (using Downie & Arnett).

1. Front margin of thorax straight in front (not lobed beneath eyes).
2. Distinct margins on side of pronotum.
3. No grooves on head above eyes.
4. Side margins of pronotum regular/entire, not irregular/undulating. (If this was the case it would key to Colaspis or Rhabdopterus, and its definitely not either of those, being too small for one thing.)

This gets to either Nodonta or Spintherophyta. Nodonta has a marginal line along the base of the pronotum, has antennomere 3 longer than 2, and antennomere 6 shorter than 5 or 7, all of which agree with this specimen. My only concern is that Nodonta doesn't have the last 5 antennomeres "abruptly widened" while Spintherophyta does. This specimen's has the outer ones wider but I'm not so sure they are "abruptly" wider. The illustration of Nodonta in Downie and Arnett has similar antennae to the specimen. I think they mean that it is abruptly wider in the apical half of the antennomere. So I'm pretty sure its Nodonta, although I could be wrong (not having a Spintherophyta handy to look at).

4 species of Nodonta are listed for northeastern US.
1) N. clypealis has a "markedly constricted clypeus between antennae." I don't see this character.
2) N. puncticollis has "punctures of pronotum substrigose" and oblong body shape. Pronotal punctures seem normal and the size range (3.5 to 4.2 mm) is kinda big (its only 3 mm).
3) N. convexa has "metasternum coarsely punctate on sides." Definitely not this. Sides are impunctate.
4) N. tristis. Size 3 to 4 mm, black legs, elytral punctures tending to be in rows, outer antennomeres blackish, and being listed as a common species swept from "various herbs and shrubs." Seems to be a match.

Sorry this is long-winded! Actually I found an online key here while writing this and the pronotal shape matches N. tristis, so now I am pretty sure I got the ID right.

Thanks ...
Thank you for the insight. On the other picture the second antennal segment ¨seems´ rather thick/big. This is typical for Spintherophyta. This was my main doubt. But the picture is rather blurred. If the third is larger than the second there is no problem. These guys are difficult to identify anyways.
Nodonta is called Brachyphnoea now by the way:
so Brachyphnoea tristis

If it is Nodonta tristis this would be the first picture of a species of Nodonta on the internet. It seems a bit messy with Nodonta, Nodonota and Brachyphnoea all being possible names for the genus. I think the genusname should be Brachyphnoea. What made you come to this id. Can you exclude some other Eumolpinae genera like Spintherophyta??

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