Found on a rosebush; looked like a twig. The antenna look like thorns. Reddish nub on tail end looks like a leaf bud. Moves like an inch worm. (Charleston, South Carolina)
Yes, it is an inchworm caterpillar. These are in the family Geometridae and turn into moths.
There is one genus that is known to have filaments on the body, but so far all I have found have filaments on the middle of the body not on the head that look like antenna.
That one is certainly well camouflaged on the rose. Most inchworms do resemble twigs. If they are not inching there way along, they may be found standing straight out to look like a small twig.
I will keep looking to see if I can find a better ID.
This family of caterpillars are found all over North America. They feed on a wide variety of plants and trees, but none are known as a pest. What little they eat, will not cause a problem to the longevity of a plant.
These caterpillars do not cause a rash nor sting.