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Spider wasp and fishing spider prey - Anoplius depressipes - female

Spider wasp and fishing spider prey - Anoplius depressipes - Female
Stone Lake, Sawyer County, Wisconsin, USA
July 16, 2021
A black wasp preying on a fishing spider on a lake in northern Wisconsin. ?Anoplius depressipes and Dolomedes triton?

Moved from Spider Wasps.

Feeling pretty confident in this move because it doesn't seem like there are many (any?) other options for parasitizing aquatic spiders like that. Behavior on the water matches as well, which makes sense considering the modification to the front tibiae for "water skiing".

Moved from ID Request.

Species ID?
Do you think the species of wasp is Anoplius depressipes? From my reading, some sources state that A. depressipes is the only species of spider wasp that preys upon fishing spiders in the water.

That is probably correct. Nice!

Impressive! The wasp seems ju
Impressive! The wasp seems just as comfortable on the water as its prey is, did you see the hunt?

The setting
I did not witness the hunt. I first spotted the wasp when it was on the water with its prey. I watched as it dragged the spider onto shore (beach sand) and then along the sand into some flotsam, where I lost it. I took several photos. The next day I witnessed nearly the same phenomenon at the same location, this time spotting the wasp (same individual?) as it dragged its prey (another Dolomedes triton) along the beach toward the same collection of debris. I have several photos of that event too.

I am presuming that the wasp is Anoplius depressipes. Right?

Agreed on the spider

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