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Wedge-shaped beetle - Ripiphorus diadasiae - male

Wedge-shaped beetle - Ripiphorus diadasiae - Male
Santiago Oaks Regional Park, Orange, Orange County, California, USA
June 9, 2010

Images of this individual: tag all
Wedge-shaped beetle - Ripiphorus diadasiae - male Wedge-shaped beetle - Ripiphorus diadasiae - male Wedge-shaped beetle - Ripiphorus diadasiae - male Wedge-shaped beetle - Ripiphorus diadasiae - male Wedge-shaped beetle - Ripiphorus diadasiae - male

Moved from Ripiphorus sexdens.

This would appear to be R. diadasiae based on the key
Given antennae colouration.

Thanks! I think you and Aaron have it right.
I've moved the images.

Moved tentatively based on Dr. Thomas's comment
Moved from ID Request.

Dr. Thomas and =v= : Please see comments here
Info on the bees, which could shape ID, was not available at the time this was posted. Please see Dr. Ascher's comments:

Info on the bees
thanks, Ron! you can check the key and spp. accounts in(1) -- what i see in that paper definitely supports Mike's suggested ID

Fine with me, =v=
Just wanted to be sure, since Dr. Ascher had it otherwise. I am no good with keys and know precious little about insect parts. Intend to keep it that way!

I assume that this is a male and that the females have simpler antennae.

My assumption, too.
Still hoping for something definitive, but am pretty sure we're right.

(Written later) Someone's added sex symbols to a couple of images, and I've marked the rest.

I suspect it is genus Ripiphorus
but am not certain

Ripiphorus sexdens Linsley & MacSwain
Matches this is general form and coloration and distribution.

Male antenna coloration and species determination
Might this be R. diadasiae rather than R. sexdens?

The relevant terminal couplet in Linsley & MacSwain's 1951 key(1) for males reads:

    4a) Tarsal claw with ten inner teeth; antennae distinctly darker near apex. 8.5-10 mm. California...........................R. diadasiae
    4b) Tarsal claw with seven or eight inner teeth; antennae concolorous from base to apex. 6-7 mm. Southern California to Washington.......R. sexdens

Also, in Linsley & MacSwain(1), bees of the genus those Ron found associated with this ripiphorid...are positively recorded as hosts for R. diadasiae while the host for R. sexdens was given as "unknown".

Thanks, John.
That's what I'd thought, too. BTW, I have some interesting bee posts in the works.

I look forward to the bee posts
what bees were nesting in the area where you found this beetle?


Several kinds
What I'm fairly sure are Diadasia were about twenty feet away. (Perhaps these are mallow visitors, as were those last year at Nix.) There were also bees nestled in bindweed, similar to the way they are in coyote gourd blooms.

That's good extra info
According to references (e.g. Linsley & MacSwain(1)) males frequent nesting sites of hosts...presumably looking for newly emerged females. Also, bindweed is in the Convolvulaceae, which is another family that, like Malvaceae, has specialist Diadasia pollinators...according to this reference.

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