Fascinating caterpillar

The polydamas, also known as the gold rim swallowtail, tailless swallowtail and scientific name Battus polydamas lucayus, lays its eggs on the Dutchman pipe. This is the only swallowtail that lacks the tails at the base of the secondary wings, according to the University of Florida.

This species can be found throughout peninsular Florida, as well as in the Florida Keys. There are some that wander as far north as Missouri and Kentucky.

The polydamas lays yellow to orange eggs in clusters of 10 to 14, which can typically be spotted on newly developed stems, or growing tips, of the Dutchman pipe.

The butterfly tends to lay its eggs on the Dutchman pipe that are in sunny areas, although the caterpillars have a higher survival rate in the shade. The eggs can be yellow to orange in color and 1 mm in diameter. As they mature the eggs will turn a greenish color as the larvae develop.

The polydamas swallowtail caterpillars feed in groups when they are small, devouring the youngest leaves, as well as flowers before moving onto the older portions of the Dutchman pipe.

The caterpillar will go through four instars, 19 to 24 days, before it’s ready to form its chrysalis. The colors of the caterpillars are a bit different during the first instar, with tan and small tubercles. Once the caterpillar molts into the second instar, they become dark brown with larger tubercles.

There are quite a few polydamas caterpillars of every instar in the garden, with a few of the larger ones brought into the butterfly house.

The babies have returned

I spotted at least a dozen of the polydamas swallowtail caterpillars on my Dutchman pipe this morning.

These are among my favorites as they eat in clusters when they are younger, only devouring the youngest leaves. Often times when you walk in the garden you see leaves falling, as they chomp away on certain parts, letting the rest fall to the ground.

The female butterfly will lay anywhere between 10 to 14 yellow, to orange eggs in clusters, typically on newly developed stems, or growing tips of its host plant. The caterpillars go through four instars, anywhere from 19 to 24 days, before they are ready to form its chrysalis. The colors of the caterpillars are a bit different during the first instar, with tan and small tubercles. Once the caterpillar molts into the second instar, they become dark brown with larger tubercles.

The polydamas caterpillar

It never fails, as soon as my Dutchman Pipe slowly grows back, the polydamas swallowtail caterpillars return. I spotted at least six this morning. The caterpillar will grow to approximately 5.3 centimeters before creating its chrysalis. It’s fun to watch these guys grow as they change in texture – from a rough textured appearance to more of a smooth texture – and can change in color ranging from dark brown to light tan.

Rest after molting

The polydamas, also known as the gold rim swallowtail, tailless swallowtail and scientific name Battus polydamas lucayus, lays its eggs on the Dutchman pipe. The three Dutchman pipe plants have tons of caterpillars once again.

The caterpillar will go through four instars, 19 to 24 days, before it’s ready to form its chrysalis. The caterpillars are mostly dark purple brown with orange tubercles, but can come in a lighter version as well. They have a black head, prothorax top is orange and short dark stripes.Each time it molts its skin, the caterpillar will consume its exoskeleton to conserve the nutrients.

The polydamas swallowtail caterpillars feed in groups when they are small, devouring the youngest leaves, as well as flowers before moving onto the older portions of the Dutchman pipe. The caterpillars grow up to 2.1″ in length. Caterpillars can be found throughout the year in southern Florida.

Busy little, big caterpillars

The polydamas swallowtail caterpillars have certainly been busy in the garden eating the Dutchman pipe almost down to sticks, and traveling long distances to find areas to make its chrysalis.

This polydamas caterpillar traveled pretty far away from its Dutchman pipe. It was blowing in the wind when we found it on the branches.

The mature caterpillars can reach 2.1 inches in length before it starts its chrysalis. They remain in the caterpillar stage, four different instars, from 19 to 24 days to reach that desired length.

The polydamas caterpillar attached to its silken thread on a milkweed plant in the garden. To the right of it is a monarch egg that should hatch any day now, as it is turning a darker color.
Three polydamas chrysalis on a milkweed plant in our butterfly house.

Depending on where they make their chrysalis it will resemble either a green, or brown leaf, as pictured above. We also have chrysalis in the butterfly house that are either on branches or the sides of the house that are brown in color mimicking that dead leaf.

The silken thread is pretty amazing.

The polydamas swallowtail butterfly typically emerges from its chrysalis at about 18 days.

As always, check out my page on polydamas swallowtails: https://bit.ly/3MHVXnb.