I can´t really tell what the caterpillar is. From all the little things coming off its back and general shape, tt reminds me of a limacodid. Those little things would be little spikes filled with poison, are they hairs maybe. It could be a lichen feeder too from the fact that it has that type of color, matching typical central Texas tree bark lichen, is rather small. But I can´t tell. Perhaps ask at the lab. John Abbott might be able to find a moth person. Our old guy Gillaspie might know but he is out of commission, I think.