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Photo#1662349
Sawfly Larvae - Halidamia affinis

Sawfly Larvae - Halidamia affinis
Eugene, Lane County, Oregon, USA
May 15, 2019
I was looking for bugs at the park on a rainy day and saw these, what I believe are sawfly larvae, all over a certain type of plant, which I later had identified as Galium aparine.

Some searching and collaborative effort of others led to the belief that they're Halidamia affinis, which is a sawfly larva known for having this same host.

Images of this individual: tag all
Sawfly Larvae - Halidamia affinis Sawfly Larvae - Halidamia affinis Sawfly Larvae - Halidamia affinis

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Halidamia affinis
(appearance + host)
In Lorenz&Kraus there is a description of a larva.
Some details are not visible on these images, such as the shape of the prolegs. But there are other observations of obviously the same species, where the characteristic wide "foot" is clearly visible.
https://bugguide.net/images/raw/ZZ6/LRZ/ZZ6LRZ9LHZELHZ6LXRYZYLULLZCZFLTZHZCL7ZVLSZSH0Z0H4RZH0Z2LRZNLFL2LLZCZFLWLLZ6LQR.jpg
Aglaostigma spp. has ordinary, not wide feet. And 7 annulets.
Halidamia affinis has 6 annulets and matches the description of Lorenz&Kraus.

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