Phalaena opercularis Smith, 1797 [ 1 ] [ 2 ] Megalopyge albizona Dognin, 1923 Megalopyge bissesa Dyar, 1910 Megalopyge briseis Dyar, 1910 Megalopyge costaricensis Schaus, 1912 Megalopyge govana Schaus, 1904 Megalopyge incachaca Schaus, 1927 Pimela lanuginosa Clemens, 1860 Lagoa ornata Druce, 1887 Megalopyge opercularis is a moth of the family Megalopygidae . It has numerous common names, including southern flannel moth for its adult form, and puss caterpillar , asp , Italian asp , fire caterpillar , woolly slug , opossum bug , [ 3 ] puss moth , tree asp , or asp caterpillar . The inch-long larva is generously coated in long, luxuriant hair-like setae , making it resemble a tiny Persian cat , the characteristic that presumably gave it the name "puss." It is variable in color, from downy, grayish white to golden brown to dark, charcoal gray. It often has a streak of bright orange running longitudinally. The "fur" on early-stage larvae is sometimes extremely curly, giving them a cottony, puffed-up look. The body tapers to a tail that extends well beyond the body, unlike its relative M. crispata . [ 4 ] The middle instar has a more disheveled, "bad-hair-day" appearance, without a distinctive tail. The "fur" of the larva contains venomous spines that cause extremely painful reactions in human skin upon contact. The adult moth is covered in long fur in colors ranging from dull orange to lemon yellow, with hairy legs and fuzzy black feet. [ citation needed ] The cocoons that these caterpillars emerge from vary in size from 1.3 to 2.0 centimeters and contain small hair pockets on the back and flattened front end, the latter covering the operculum at least until it is completely formed. [ 5 ] M. opercularis can be found on oak , elm , and wild plum , among others, as well as many garden plants such as roses and ivy . It is distributed throughout the Eastern United States between extreme southeastern Virginia and Florida , the Southern United States , Mexico , and parts of Central America and South America . The caterpillar has two broods , one in the summer and the other in the fall. Late larvae may stay in their cocoon all winter, and emerge in late spring as an adult. [ 6 ] Dangers and treatment of stings The caterpillar is regarded as a dangerous insect because of its venomous spines. Exposure to the caterpillar's fur-like spines leads to an immediate skin irritation characterized by a "grid-like hemorrhagic papular eruption with severe radiating pain." Victims describe the pain as similar to a broken bone or blunt-force trauma, [ 3 ] or even white hot. [ 7 ] The reactions are sometimes localized to the affected area, but are often very severe, radiating up a limb and causing burning, swelling, nausea, headache, abdominal distress, rashes, blisters, and sometimes chest pain, numbness, or difficulty breathing. [ 8 ] [ 9 ] Sweating from the welts or hives at the site of the sting is not unusual. [ 10 ] The venom from the spines is best treated within hours of first contact. For first aid, the spines (if present) should be removed by using cellophane tape. [ 8 ] Some remedies, which are reported to have varying degrees of success, include ice packs , oral antihistamine , baking soda , hydrocortisone cream, juice from the stems of comfrey plants, and calamine lotion . [ 8 ] The caterpillar sting causes a condition called urticarial dermatitis or erucism, with M. opercularis contact being the most commonly reported source in the United States. [ 11 ] ↑ Smith, James Edward (1797). "Tab. LIII. Phalæna opercularis " . The Natural History of the Rarer Lepidopterous Insects of Georgia. Including their systematic characters, the particulars of their several metamorphoses, and the plants on which they feed. Collected from the observation of Mr. John Abbot, many years resident in that country . Vol. 2. London: T. Bensley. pp. 105– 106. ↑ Simmons, Alvin M.; Wiseman, B. R. (1993). "James Edward Smith - Taxonomic Author of the Fall Armyworm" . The Florida Entomologist . 76 (2): 275. doi : 10.2307/3495726 . JSTOR 3495726 . 1 2 Hossler, Eric W. (2009). "Caterpillars and moths" . Dermatologic Therapy . 22 (4): 353– 366. doi : 10.1111/j.1529-8019.2009.01247.x . PMID 19580579 . S2CID 31799282 . ↑ Wagner, David L. (2005). "Flannel Moths – Megalopygidae" . Caterpillars of Eastern North America . Princeton Univ. Press. p. 55. ISBN 1400834147 . ↑ Hall, Donald W. (25 April 2022) [Originally published January 2013]. "Puss Caterpillar (Larva), Southern Flannel Moth (Adult), Megalopyge opercularis (J. E. Smith 1797) (Insecta: Lepidoptera: Zygaenoidea: Megalopygidae)" . Edis . 2013 . University of Florida Institute for Food and Agricultural Sciences Extension. doi : 10.32473/edis-in976-2013 . Pub. No. EENY-545 . Retrieved 1 August 2024 . ↑ McGovern, John P.; Barkin, Gilbert D.; McElhenney, Thomas R.; Wende, Reubin (1961). " Megalopyge opercularis : Observations of Its Life History, Natural History of Its Sting in Man, and Report of an Epidemic". JAMA . 175 (13): 1155– 1158. doi : 10.1001/jama.1961.03040130039009 . ↑ "Venomous caterpillar 'no one has heard of' sends New Kent woman to ER" . 11 September 2020. 1 2 3 Eagleman, David M. (2007). "Envenomation by the asp caterpillar ( Megalopyge opercularis )". Clinical Toxicology . 46 (3): 201– 205. doi : 10.1080/15563650701227729 . PMID 18344102 . S2CID 15696836 . ↑ Demkovich, Laurel (June 20, 2018). " 'BE AWARE': Pasco mom posts to Facebook after son's caterpillar sting leads to ER trip" . Tampa Bay Times . Retrieved 2018-06-21 . ↑ Eagleman, David M. (January 2008). "Envenomation by the asp caterpillar ( Megalopyge opercularis )" . Clinical Toxicology . 46 (3): 201– 205. doi : 10.1080/15563650701227729 . ISSN 1556-3650 . PMID 18344102 . S2CID 15696836 . ↑ Michienzi, Avery E.; Holstege, Erik P.; Cole, Ryan J.; Charlton, Nathan P. (2022). "The Sting of a White Flannel Moth Caterpillar ( Norape ovina )" . Wilderness & Environmental Medicine . 33 (3): 329– 331. doi : 10.1016/j.wem.2022.03.011 . PMID 35577658 .

Data related to Megalopyge opercularis at Wikispecies Media related to Megalopyge opercularis at Wikimedia Commons Research on the Asp Caterpillar at Baylor College of Medicine [ link removed ] Megalopyge opercularis on the UF / IFAS Featured Creatures website. Wikidata : Q4043912 Wikispecies : Megalopyge opercularis BAMONA: Megalopyge-opercularis BioLib: 1139548 BugGuide : 4476 GBIF (old): 1751572 iNaturalist : 84185 Insecta.pro: 16417 IRMNG : 10333838 LepIndex : 75422 NatureServe : 2.113993 Open Tree of Life : 23953 Moths described in 1797 Articles with short description Short description is different from Wikidata Wikipedia external links cleanup from August 2023 All articles with unsourced statements Articles with unsourced statements from May 2018 Articles with 'species' microformats Articles with unsourced statements from August 2024 Commons category link is on Wikidata Deprecated archive template links