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Teneb? - Acantholomidea porosa

Teneb? - Acantholomidea porosa
Palo Alto Baylands, Santa Clara County, California, USA
September 6, 2008
Size: ~ 5 mm
This small, black beetle was plodding slowly along the ground and reminded me of a darkling beetle. The elytra appear to be fused?? I was not allowed to collect it here... Probably frass if it's from a common family or genus.

Images of this individual: tag all
Teneb? - Acantholomidea porosa Teneb? - Acantholomidea porosa

Moved from Acantholomidea.

Moved from Shield-backed Bugs.

Moved from Beetles.

Based on the appearence of the head
and the antennae, I think that this is actually a shield-backed bug. See info here.

a true bug
Acantholomidea sp., i believe

Thanks -
to both of you for your help! Fooled me, that's for sure, although that's not very hard to do! :)

V - let me know if you're confident of the genus - would be a new genus for BG, although I see there are other images that you've commented on that remain at the family level for now. Would you ever consider becoming an editor, so that you could help us create guide pages and move some of these images??

These are perhaps the same genus then (and only appears to be one species in this genus in the US)?

I’m confident of the genus...
...based on what I've learned from JE McPherson 1982 book.
> consider becoming an editor
–-I gave it some thought and decided against it

Thanks, V!
You help out a LOT with your ID's as it is - thanks for your continued help on this site!

I will plan on creating a guide page for this genus and placing both sets of images there... Please let me know if there are particular facts from your reference that you want me to include on the Info page (feel free to email me directly if you want). This appears to be a monotypic genus, at least in the Nearctic?

Edit: Please see the comments on this image for a possible complication:

I've taken the liberty of emailing Dr. McPherson in the hopes that he can comment on these sets of images...

Dr. J. E. McPherson -
very graciously took a look at this image, as well as some of the other linked images in this post, and comments as follows:

"The specimen certainly looks like Acantholomidea. However, I'm not absolutely sure of the species. A. denticulata has small teeth along the anterolateral margin of the pronotum; A. porosa does not. The two are easily separated. Only A. porosa is known from California".

With regards to the placement of porosa, he mentions:
"Acantholomidea porosa was moved from Camirus by John Lattin in his 1964 treatment of the scutellerids. This was his Ph.D. thesis from Berkeley and should be available".

He suggested that I might contact Dr. Lattin at Oregon State - I sent him an email today, but I'm not sure he'll have the time to reply.

If I understand this correctly, it sounds like the two species in the genus can be separated by pronotal morphology and/or geographical location, although I'm not sure of the precise geographical distributions. I will make a guide page for the genus and the two species, and place this image in porosa, unless there are other comments or objections.

Camirus porosus is synonim of Acantholomidea porosa.
Some authors did not recognize this synonimy because Lattin did not published his work (1964) but this problem was solved in 1995. See (1)

And while I was typing my response above,
this answer appeared. Boy am I slow.

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