Swallowtail, Anise Swallowtail, and the Giant Swallowtail butterflies use this plant (among others) to lay their eggs, so their caterpillars can eat the foliage and grow. If it isn’t molting, it will normally move. Adult giant swallowtail, Papilio cresphontes Cramer, with wings closed. The giant swallowtail can be distinguished from the Schaus' swallowtail by the yellow-filled tails (Schaus' swallowtail tails are all black), and the small, brick-red patch just interior to the blue median band on the ventral hind wing. Generally the Anise (Photo by Phil van Solen) When feeding or tending to caterpillars, it is safest not to move a caterpillar unless it is moving its rear legs itself. The pupa actually forms under the skin of the larva, which will remain in the pre-pupa stage for about a day. The pupa is an intermediate stage between the larvae and the adult butterfly. With the lush green new fennel rising, the Anise Swallowtail butterfly has arrived; its time has come. It is the state butterfly of Oklahoma and New Jersey. Although some species do fine if they are moved when their legs… An extremely similar-appearing species, Papilio joanae, occurs in the Ozark Mountains region, but it appears to be closely related to Papilio machaon, rather than P. polyxenes. Figure 2. When caterpillars transform into pupae, they stop feeding and search for a substrate to perform the last molting. The Anise Swallowtail is a species of swallowtail butterfly known by the scientific name Papilio zelicaon.It is the most common swallowtail, and is often confused with the Tiger Swallowtail.The Anise Swallowtail is a very stunning butterfly and is beautiful to see in nature.It has an outline of black on the top part of its wing with lots of yellow, a little blue and barely any orange. If it isn’t moving, you can gently tickle the rear of the caterpillar. Anise Swallowtail larva in the pre-pupal stage. The mature Swallowtail larva creates a silken button, which the cremaster is secured to, and a silken 'girdle' which will hold it in place around the middle. With the exception of Alaska and Hawaii, the entire United States is home to either the Anise Swallowtail or the Black Swallowtail butterflies (or both). The female lays its numerous eggs one at a time on fennel stems.

It has been in the J-shape pre-pupal stage for at least a day now and I am wondering if this is normal or if it may have somehow expired at this stage because of being jostled too much or whatever. Have a few fifth instar caterpillars collected off the fennel plants and have one not yet gone to chrysalis even though it has already strung itself up with a girdle. As the pupal stage approaches, the prothoracicotropic or PTTH hormone is produced. Papilio polyxenes, the (eastern) black swallowtail, American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America.