Fauna
Insect

Household Casebearer

Phereoeca uterella

Also known as Plaster Bagworm, Wall Moth, Spindle Casebearer

Larvae construct a distinctive, flat, pumpkin seed-shaped case out of silk interwoven with sand grains, lint, and fragments of dead insects. The caterpillar crawls along walls and ceilings by poking its head and legs out of either end of this reversible shelter. While the tiny adult moths are weak fliers that rarely feed, the larvae are famous indoor scroungers that subsist on spiderwebs, shed human hair, and accumulated household fibers.

InsectHouseholdNocturnal
Household Casebearer reference
(c) Kane Sandoval, some rights reserved (CC BY) · cc-by
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preySpider silk, Detritus, Fibers
Predators
  • Jumping spiders
  • House geckos
  • Parasitoid wasps
ThreatsVacuuming, humidity control, and household cleaning practices
HabitatsWarm human dwellings, warehouses, masonry walls, and shaded rock crevices
Life span2–4 months total (larval stage 1–2 months; adults live 1–2 weeks)
Classification
  1. OrderLepidoptera
  2. FamilyTineidae
  3. GenusPhereoeca
  4. SpeciesPhereoeca uterella
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Harmless to humans and pets; safe to observe at close range.
Responsible observation
  • Look on vertical surfaces: Check plaster walls, baseboards, and shaded outdoor stucco in humid climates.
  • Observe two-way movement: Watch patiently to see the larva flip around inside its case and emerge from the opposite slit.
  • Manage humanely: Relocate stray cases outside or reduce indoor humidity to discourage them naturally.
Related species
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Moonlight Marvels

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