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Photo#1488752
Wood-dwelling larvae - Dirrhagofarsus ernae

Wood-dwelling larvae - Dirrhagofarsus ernae
Upper Iowa River Wildlife Management Area, Winneshiek County, Iowa, USA
January 27, 2017
Found in wood of a dead aspen (Populus) -- quaking aspen, I think (P. tremuloides). The tree had been heavily attacked by woodpeckers, which led me to investigate what the birds were so excited about. A single Xylophagus sp. larva (significantly larger than these) was also found in the wood.

All larvae I found were folded in half (?!?!?) inside short, narrow, unstained cavities in the wood that they apparently created.

In situ

Images of this individual: tag all
Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae Wood-dwelling larvae - Dirrhagofarsus ernae

Moved

Moved
Moved from ID Request.

Eucnemidae.
Found these all the time in Wisconsin when collecting with my favorite entomology professor, who specializes in beetles. They're fairly distinct mouthparts. According to the immature insects book "Body subcylindrical, lightly sclerotized, prothorax wider than other segments (similar to larvae of buprestids) with t-shaped, sclerotized rods dorsally or dosally and ventrally and mouthparts exposed dorsally" = Melasis or Isorhipis. Although it does note that there is not a lot known about the family in general, and only a few species have been described.

Does look very much like this one, but the rods are a little different. There aren't any images of Isorhipis larvae unfortunately.:



Xylophagidae have elongate tube-like moutherparts and the back end is pretty sclerotized with two projections.

Compare:



I collected a bunch of other larvae from wood one year, left them to emerge as adults, ended up with one adult xylophagid and everything else disappeared / got eaten. Whoops!

 
Hi Natalie
Thank you for sharing this information! I also just heard back from Artem Zaitsev who gave the same answer as you (and suggested Robert Otto might be able to ID the larvae down to genus or species). It's good to know the Immature Insects book is a helpful reference for this family, too.

Wow, I see Jim McClarin sure did a nice job of sharing pictures and information about eucnemid larvae here on Bugguide (in 2007...wow, that was 10 yrs ago now?!?!)

I love your story about the xylophagid you reared! Sounds like it was hungry. Yep, I've seen the sort of xylophagid larvae you link to (in fact, there was one in the same snag where I found these eucnemids!)...and was just imagining that these formerly mystery larvae were maybe a type of immature xylophagid that had not yet been described (sounds like larvae of only a few genera of Xylophagidae are known). The leglessness and funny sclerotization were a big part of what made me think that. Clearly it was my imagination running away with me... :-)

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