Tineola bisselliella

(Hummel, 1823)

webbing clothes moth, common clothes moth, clothing moth

Tineola bisselliella is a small in the , notable as a significant pest of stored wool and natural fibers. are 6–7 mm in body length with a 9–16 mm wingspan, characterized by pale yellowish-ochreous and a distinctive red-orange tuft of hair on the . The is , now rarely found outside human dwellings. possess the unusual ability to digest keratin, enabling them to feed on wool, , fur, and other animal-derived materials. Adults do not feed and have atrophied mouthparts; all damage is caused by larval feeding.

Tineola bisselliella by (c) Георгий Виноградов (Georgy Vinogradov), some rights reserved (CC BY), uploaded by Георгий Виноградов (Georgy Vinogradov). Used under a CC-BY license.

Tineola bisselliella (8657699672) by Donald Hobern from Copenhagen, Denmark. Used under a CC BY 2.0 license.

Tineola bisselliella Piazzo 03 by Syrio. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Tineola bisselliella: /tɪˈniːoʊlə bɪˌsɛliˈɛlə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from similar by its - or ochreous coloration and the red-orange tuft of hair on the . Differs from the casemaking (Tinea pellionella) by lacking the dark spots on typical of that and by larval : T. bisselliella spin mats under which to feed, while T. pellionella larvae construct portable silk cases. are light-averse, unlike many other species that are attracted to light.

Images

Appearance

Small with body length 6–7 mm and wingspan 9–16 mm (most commonly 12–14 mm). light ochreous, sometimes brownish-tinged, with a distinctive red-orange tuft of hair. thread-like, about four-fifths the length of the . Forewings pale yellowish-ochreous with fuscous base of . ochreous grey-whitish. , eventually almost transparent, with a head, living in a tube.

Habitat

Strictly ; almost exclusively found indoors in human dwellings, museums, wool stores, and other buildings containing stored natural fibers. Rarely occurs outdoors. Prefers dim or dark areas with low disturbance. In wool stores, occur in surface layers of compressed wool or loose wool protruding through packaging. Favors areas where fibrous debris accumulates, such as under furniture, carpet edges, and along baseboards.

Distribution

to the western Palearctic, now due to human transport. Established in North America, Australia, and numerous other regions worldwide. Outdoor trapping in Berlin demonstrated seasonal abundance in urban areas with absence in surrounding countryside, supporting rather than natural occurrence. Presence in some European countries (France, Greece, Slovenia, Switzerland) unrecorded likely due to data gaps rather than true absence.

Seasonality

Seasonal in the wild, but year-round activity in heated buildings. In wool stores, activity peaks around dusk with greatest activity 3 hours after sunset; peak occurs earlier on cool evenings. Two to three per year typical, though can complete in one month under optimal conditions (24°C, 70–75% ) or extend to several years under unfavorable conditions.

Diet

feed on keratin-containing materials: wool, , fur, feathers, hair, and other animal-derived fibers. Also consume stored foods including grains, flour, semolina, bran, and biscuits. Can digest synthetic and cotton fibers if blended with wool, though these provide no nutrition. do not feed; they possess atrophied mouthparts and obtain all nutrition during the larval stage.

Life Cycle

Females lay in clusters of 30–200, adhering to surfaces with gelatinous glue. Eggs hatch in 4–10 days. through 5–45 over 1 month to 2 years depending on conditions, feeding under mats and partially emerging at night to acquire food. occurs in silk incorporating substrate fragments; pupal stage lasts 10–50 days. live 15–30 days, with females mating multiple times (up to 11 matings observed). from egg to egg typically 4–6 months with two per year, though highly variable.

Behavior

prefer scuttling across surfaces to flying; some individuals never . Both adults and are strongly photophobic, seeking darkened areas. Larvae spin tubes or mats under which they feed, emerging partially at night to forage. Adults are attracted to potential larval such as furs and old rugs. Females exhibit with multiple matings, including repeated matings with the same male. Larvae can metabolize water as a byproduct of keratin digestion, eliminating the need for liquid water.

Ecological Role

Keratinophagous in human-modified environments. Functions as a pest in stored product . Serves as for including Trichogramma evanescens ( parasitoid) and Apanteles carpatus (larval parasitoid). for including Uloborus geniculatus, which can significantly suppress .

Human Relevance

Major worldwide pest of woollen products, causing up to $1 billion in damage in the United States alone. Infests clothing, carpets, upholstery, museum specimens, and stored food products. Subject to extensive control efforts including anoxic treatments, freezing, heat treatment, traps, , and using . to many control methods and ability to survive extreme conditions make difficult. Mentioned in the Bible as a destroyer of materials.

Similar Taxa

Tinea pellionella (casemaking clothes moth)Similar size and , but T. pellionella has dark spots on and construct portable cases rather than feeding under stationary silk mats.
Tinea translucens (large pale clothes moth)Larger size and different pattern; less common .
Monopis spp.Related with similar habits but distinct patterns and coloration.

Misconceptions

are frequently blamed for damage to clothing, but adults do not feed and possess non-functional mouthparts. All damage is caused by larval feeding. The ' "webbing " refers to larval production, not adult web-spinning .

More Details

Physiological specializations

can digest keratin, a to most enzymatic breakdown; mechanism possibly involves microbes. Can metabolize water from keratin digestion, surviving without liquid water. Tolerates temperatures from 5°F to 95°F and can digest toxic metals including arsenic, mercury, and lead. Can chew through soft plastics to access food sources.

Evolutionary history

Belongs to ancient that predates more recognizable families. Likely originated in Africa and expanded globally via 19th-century sailing ships. Associated with human ancestors since before Homo sapiens, possibly following primates using nesting materials. Now obligately , rarely found in natural outdoor .