Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Orange caterpillar - Cycnia collaris

Orange caterpillar - Cycnia collaris
Toledo, OH, Lucas County, Ohio, USA
August 12, 2011
Size: approximately 1.5 inches
I think this might be a Baltimore Checkerspot caterpillar, but I'm not sure. The plant is common milkweed, but I also saw the same caterpillar on whorled milkweed. There is native turtlehead nearby.

Cycnia inopinatus was synonymized with Cycnia collaris.

Moved from ID Request.

One of the Cycnia.
Not sure what would be so dark, maybe C. inopinatus.

Seems Right
I think you're right. Other photos of C. inopinatus are similar to the caterpillar I see. The angle of my photo exaggerates the spines.