Biology:Pyrrharctia isabella
| Isabella tiger moth | |
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.jpg)
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| Adult | |
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| Woolly bear caterpillar | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Superfamily: | Noctuoidea |
| Family: | Erebidae |
| Subfamily: | Arctiinae |
| Genus: | Pyrrharctia |
| Species: | P. isabella
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| Binomial name | |
| Pyrrharctia isabella (J. E. Smith, 1797)
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| Synonyms | |
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Pyrrharctia isabella, the Isabella tiger moth, whose larval form is called the banded woolly bear, woolly bear, or woolly worm, occurs in the United States and southern Canada.[1][2] It was first formally named by James Edward Smith in 1797.
Description
The thirteen-segment larvae are usually covered with brown hair in their mid-regions and black hair in their anterior and posterior areas. In direct sunlight, the brown hair looks bright reddish brown. Adults are generally dull yellowish through orangish and have robust, scaly thoraces; small heads; and bright reddish-orange forelegs. Wings have sparse black spotting.[3]
The isabella tiger moth can be found in many cold and temperate regions. The banded woolly bear larva emerges from the egg in the fall and overwinters in its caterpillar form, by allowing most of its mass to freeze solid. First its heart stops beating, then its gut freezes, then its blood, followed by the rest of the body. It survives being frozen by producing a cryoprotectant in its tissues.[4] This freezing occurs outside of body cells, but not within. In the spring, it thaws.
Larval setae do not inject venom and are not urticant; they do not typically cause irritation, injury, inflammation, or swelling.[5] Handling larvae is discouraged, however, because their sharp, spiny hairs may cause dermatitis in some people.[6]
Head of a caterpillar
Adult
Isabella tiger moth with hindwings
Fresh laid Isabella tiger moth eggs
Mature Isabella tiger moth eggs
Diet
File:A Black Woolly Bear forages in Okanagan Mountain Provincial Park.webm This species is a generalist feeder, consuming many plant species, including herbs and trees.[1] Based on the caterpillars' wide range of food plants, this moth could be found almost anywhere that plants grow.[7]
Related species
Singer et al. showed that the larvae of a related moth, Grammia incorrupta (whose larvae are also called "woollybears"), consume alkaloid-laden leaves that help fight off internal parasitic fly larvae. This phenomenon has been proposed to be "the first clear demonstration of self-medication among insects." Within the same family, the larvae of the garden tiger moth (Arctia caja) are also known as woollybear caterpillars and consume an alkaloid diet similar to Grammia incorrupta.[8]
In culture
Folklore
Canadian and U.S. folklore holds that the relative amounts of brown and black hair on a larva indicate the severity of the coming winter. It is believed that if a Pyrrharctia isabella's brown band is wide, winter weather will be mild, and if the brown band is narrow, the winter will be severe. In a variation of this story, the color of stripes predicts the winter weather, with darker stripes indicating a harsher winter. In reality, hatchlings from the same clutch of eggs can display considerable variation in their color banding, and a larva's brown band tends to widen with age as it molts.[9]
Another version of this belief is that the direction in which a Pyrrharctia isabella crawls indicates the winter weather, with the caterpillar crawling south to escape colder weather. There is no scientific evidence for winter weather prediction by Pyrrharctia isabella.[10]
Woollybear festivals
Woollybear festivals are held in several locations in the fall.
- Vermilion, Ohio, in October, begun in 1973, the Woollybear Festival features woollybear costume contests for children and pets and the Woolybear 500 caterpillar races.[11]
- Banner Elk, North Carolina, begun in 1977, features crafts, food, and races. The winning woollybear predicts the winter weather for the following winter.[12]
- Beattyville, Kentucky, begun 1988, called the Woolly Worm Festival, features food, vendors, live music, and a Woolly Worm Race in which people race the woollybear caterpillar up vertical strings.[13][14][15]
- Oil City, Pennsylvania, Woolley Bear Jamboree, begun in 2008, features Oil Valley Vick to predict the winter weather.[16]
- Little Valley, New York, has held a Woolley Bear Weekend [sic] since 2012.[17]
References
- ↑ 1.0 1.1 "Species Details Pyrrharctia isabella". E.H. Strickland Entomological Museum. https://search.museums.ualberta.ca/g/2-215.
- ↑ "Woolly Worm Festival". http://woollyworm.com/.
- ↑ Beadle, David; Leckie, Seabrooke. (2012). Peterson field guide to moths of northeastern North America. Boston: Houghton Mifflin Harcourt Pub. Company. ISBN 978-0-547-23848-7. OCLC 723141254.
- ↑ Layne, Jack R.; Kuharsky, Diane K. (1 March 2000). "Triggering of cryoprotectant synthesis in the woolly bear caterpillar (Pyrrharctia isabella Lepidoptera: Arctiidae)". Journal of Experimental Zoology 286 (4): 367–371. doi:10.1002/(SICI)1097-010X(20000301)286:4<367::AID-JEZ4>3.0.CO;2-F. PMID 10684559.
- ↑ Mullen, Gary Richard; Durden, Lance A. (2002). Medical and Veterinary Entomology. Academic Press. ISBN 0-12-510451-0.[page needed]
- ↑ Wagner, David L. (2009). "The Immature Stages: Structure, Function, Behavior, and Ecology". in Conner, William E.. Tiger Moths and Woolly Bears: Behavior, Ecology, and Evolution of the Arctiidae. Oxford University Press, USA. pp. 31–53. ISBN 978-0-19-532737-3. https://books.google.com/books?id=e2pnDAAAQBAJ&pg=PA31.
- ↑ "Isabella Tiger Moth (Woolly Bear; Woolly Worm)". https://nature.mdc.mo.gov/discover-nature/field-guide/isabella-tiger-moth-woolly-bear-woolly-worm.
- ↑ Singer, Michael S.; Mace, Kevi C.; Bernays, Elizabeth A.; May, Robin Charles (10 March 2009). "Self-Medication as Adaptive Plasticity: Increased Ingestion of Plant Toxins by Parasitized Caterpillars". PLOS ONE 4 (3): e4796. doi:10.1371/journal.pone.0004796. PMID 19274098. Bibcode: 2009PLoSO...4.4796S.
- Ed Yong (March 20, 2009). "Self-medicating caterpillars use toxic plants to kill parasites". National Geographic. https://www.nationalgeographic.com/science/phenomena/2009/03/20/self-medicating-caterpillars-use-toxic-plants-to-kill-parasites/.
- ↑ Boeckmann, Catherine (August 28, 2019). "Woolly Bear Caterpillars and Weather Prediction". Old Farmer's Almana. https://www.almanac.com/content/woolly-bear-caterpillars-and-weather-prediction.
- ↑ "Woolly Bear Caterpillar - Winter Predictor Or Not?". US Dept of Commerce; National Oceanic and Atmospheric Administration National Weather Service. https://www.weather.gov/arx/woollybear.
- ↑ "Woollybear Festival »". http://vermilionchamber.net/festivals/woolybear/.
- ↑ Old Farmer's Almanac. 1999.
- ↑ Staff, WLWT Digital (October 24, 2019). "Kentucky's prognosticating woolly worm to give its winter forecast". https://www.wlwt.com/article/kentuckys-prognosticating-woolly-worm-to-give-its-winter-forecast/29565188.
- ↑ "Festivals and Events | Welcome to the City of Beattyville, Kentucky". https://www.beattyville.org/tourism/feastivals-and-events/.
- ↑ "Woolly Worm Festival". https://www.heartofthekentuckyriver.com/woollywormfestival.html.
- ↑ Robertson, Dan. "Oil Valley Vick & the NWPA Wooly Bear Society". Mystic Outer Rim Society. http://nwwoolybearsociety.9f.com/.
- ↑ "Wooly Bear Weekend with Local Manufacturers and Artisans". July 24, 2015. http://www.cattco.org/events/2013/10/19/wooly-bear-weekend-local-manufacturers-and-artisans.
External links
Wikidata ☰ Q1957464 entry
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