This caterpillar was found on an elm leaf, slowly munching its way along the leaf rib. It is a very variable caterpillar, depending on which instar it is. In the early stages it is red with long spikes. As a mature caterpillar, it has a red pattern on its back, hence its name of saddled prominent. This is not yet the final instar, possibly 4th or 5th?
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