Megalopyge opercularis bissesa

Dyar, 1910

Southern Flannel Moth, Puss Caterpillar

Megalopyge opercularis bissesa is a of southern flannel , commonly known as the puss caterpillar in its larval stage. The caterpillar is covered in dense, soft-looking hair that conceals venomous urticating spines capable of delivering painful stings. Found in the southeastern United States from the Mid-Atlantic to Florida and Texas, this insect feeds on various woody plants including oak, hickory, and apple. The caterpillar's distinctive appearance—resembling a tiny, hairy cat or 'Cousin Itt' from The Addams —belies its defensive capabilities.

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Pronunciation

How to pronounce Megalopyge opercularis bissesa: /ˌmɛɡəloʊˈpaɪdʒi oʊˌpɜrkˈjʊlərɪs bɪˈsiːsə/

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Identification

Distinguished from other Megalopyge by geographic range and subtle morphological differences; M. opercularis bissesa occurs in the southeastern US while nominate M. opercularis opercularis occurs further south. Distinguished from other stinging caterpillars by dense, uniformly distributed long hair completely concealing body form, lacking the prominent paired horns of saddleback caterpillars or the branched spines of io moth caterpillars. White flannel moth (Norape ovina) caterpillar similar but with different hair arrangement and coloration.

Images

Appearance

Caterpillar covered in long, dense, blondish to tan hair giving a soft, furry appearance resembling a small cat or toupee. Concealed beneath the hair are venomous urticating spines that break off and embed in skin. has wings but caterpillar form is most commonly encountered. Later instars of related described as resembling 'a tiny Trump toupee'.

Habitat

Found in diverse including restored tallgrass prairie remnants, oak-hickory forests, and urban landscapes. Associated with plants in open woodlands, forest edges, and areas with mixed hardwood vegetation.

Distribution

Southeastern United States from the DMV (DC-Maryland-Virginia) region south to Florida and west to Texas.

Seasonality

active during warmer months; caterpillars present summer through autumn. Multiple per year in southern portions of range.

Diet

Caterpillars feed on leaves of various woody plants including oak (Quercus), apple (Malus), birch (Betula), hickory (Carya), pecan, persimmon (Diospyros), and rose (Rosa).

Host Associations

Quercus - plantoak
Malus - plantapple
Betula - plantbirch
Carya - planthickory
Diospyros virginiana - plantpersimmon

Life Cycle

Complete with , larval (caterpillar), pupal, and stages. Caterpillar is the distinctive, hairy, stinging stage. occurs in a cocoon incorporated with caterpillar hairs. Multiple annually in southern range, fewer in northern portions.

Behavior

Caterpillar feeds solitarily on foliage. Defensive relies on venomous spines rather than active escape. are and attracted to light.

Ecological Role

Herbivore feeding on woody plant foliage; serves as for including Calliephialtes grapholithae.

Human Relevance

Medical significance due to painful, sometimes severe stings from caterpillar urticating spines. Reactions include burning pain, swelling, redness, blisters, and potential allergic reactions requiring medical attention. and nasal contact particularly dangerous. Popular curiosity due to unusual appearance but should not be handled.

Similar Taxa

Megalopyge crispataBlack-waved flannel moth caterpillar similar in appearance and also possesses urticating spines; distinguished by wavy dark lines on lighter background in later instars
Norape ovinaWhite flannel moth caterpillar also densely hairy with stinging spines; differs in hair coloration and arrangement
Automeris ioIo moth caterpillar has prominent branched spines rather than dense concealing hair
Acharia stimuleaSaddleback caterpillar has distinctive paired fleshy horns and saddle-shaped marking, not uniformly hairy

More Details

Parasitoid relationships

Documented for the ichneumon Calliephialtes grapholithae, which parasitizes the caterpillar stage. This wasp typically attacks concealed larvae.

Venom composition

Urticating spines contain venom that produces immediate and intensifying pain described as burning, stinging, and 'white hot'; medical attention recommended for reactions.