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Photo#1566202
Teeny tiny Anthidiini - Pseudoanthidium nanum - female

Teeny tiny Anthidiini - Pseudoanthidium nanum - Female
Portland, Multnomah County, Oregon, USA
July 21, 2018
Size: <5 mm
This little female is really puzzling me and she finally let me get some pictures last weekend.
  • Host plant: Shasta daisy (Leucanthemum × superbum). Only observed on this species numerous times over the past week or so (we have multiple clumps of Shasta daisies). I tried to catch her, but she wasn't amenable.
  • Size: ≤5 mm. I know for certain that she was less that 5 mm in length, because I measured the plants' central discs and they topped out at 18 mm in diameter.
  • Date & time: July 21, 2018, 3:00 pm
Is she maybe a Stelis? She didn't fit any of the keys I tried for Dianthidium or Paranthidium—and it looks like she doesn't have much of a scopa. We do have an enormous mixed population of Heriades, Megachile, and other Megachilidae nesting in our yard this year (I've been meaning to post pictures for identification), and our cuckoo bee population in general has just exploded (if she is a Stelis, she'd be the 6th cuckoo species this year and 8th overall). I also have a ton of extra photos not included here, so if you need more, please let me know! Thank you!! ETA: Apologies in advance if this is too many photos, I just wanted to make sure as many features as possible were visible.

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Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female Teeny tiny Anthidiini - Pseudoanthidium nanum - female

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Moved from ID Request.

Pseudoanthidium nanum???
this very much resembles Pseudoanthidium nanum, however they've only been recorded in MD, NJ, NY, & PA that i'm aware of. and it doesn't have much scopa because it's a male.

 
Good call Hadel
Seems to be a major range extension

 
Well, darn...
I was really, really hoping that it wasn't Pseudoanthidium nanum (which is admittedly the genus I kept getting back to when trying to ID it). I suppose I should be grateful that it seems far less aggressive and territorial than Anthidium manicatum (we ended out ripping out a bunch of plants from the garden this year to avoid attracting them). It's a bummer that we keep getting more non-native species, though. Any ideas how it got to Oregon from the Mid-Atlantic? That's just weird. It also explains this nest I found in the backyard:

I hadn't seen one that small with plant fibers in our backyard before.

 
Is it a male? I admittedly h
Is it a male? I admittedly had difficulty counting the terga, so I thought there were six (it's so hard to tell when they curve under like that)...

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