Kray Gelder
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- Location
- Georgetown, SC
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For the last 3 days I have observed this thing slowly moving around on the siding by my front door. It's 1 and 1/8 inches long.



I thought it was a chrysalis of some kind, but never heard of a moving one. Anyway, kept entering different search words, and finally found it.
It's the caterpillar of the megalopyge opercularis moth, or puss caterpillar, asp, Italian asp, opossum bug, tree asp, asp caterpillar.
From Wikipedia: "The caterpillar is regarded as a dangerous insect because of its venomous spines. Exposure to the caterpillar's fur-like spines will lead to an immediate skin irritation characterised by a "grid-like hemorrhagic papular eruption with severe radiating pain." The pain has been described by patients as similar to a broken bone or blunt force trauma. 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."
Remove the spines using tape, and get to a doctor. It is best to treat the venom within three hours.
I have never seen one before, nor even heard of it. FYI.



I thought it was a chrysalis of some kind, but never heard of a moving one. Anyway, kept entering different search words, and finally found it.
It's the caterpillar of the megalopyge opercularis moth, or puss caterpillar, asp, Italian asp, opossum bug, tree asp, asp caterpillar.
From Wikipedia: "The caterpillar is regarded as a dangerous insect because of its venomous spines. Exposure to the caterpillar's fur-like spines will lead to an immediate skin irritation characterised by a "grid-like hemorrhagic papular eruption with severe radiating pain." The pain has been described by patients as similar to a broken bone or blunt force trauma. 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."
Remove the spines using tape, and get to a doctor. It is best to treat the venom within three hours.
I have never seen one before, nor even heard of it. FYI.