At Fifth Instar Stage?
Fifth Instar Monarch Larvae Often Chew a Shallow Notch in the Petiole of the Leaf They Are Eating, Which Causes the Leaf to Fall into a Vertical Position. They...
Fifth instar monarch larvae often chew a shallow notch in the petiole of the leaf they are eating, which causes the leaf to fall into a vertical position. They move much farther and faster than other instars, and are often found far from milkweed plants as they seek a site for pupating.
How long is the fifth instar?
Monarchs go through five instars (see photo). Approximate length of body at each stage: 1st instar, 2-6mm; 2nd instar, 6-9mm; 3rd instar, 10-14mm; 4th instar, 13-25mm; 5th instar, 25-45mm. During the pupal stage the transformation from larva to adult is completed.
What happens during instar?
During immature development, larvae of insects and other arthropods molt regularly by shedding their exoskeletons. Thus, instar is a developmental stage between two successive molts in the life cycle of an arthropod and the development period of larvae in insects is divided into a few discrete stages.