Periplaneta americana

(Linnaeus, 1758)

American cockroach, waterbug, ship cockroach, kakerlac, Bombay canary

The American (Periplaneta americana) is the largest of common cockroach, despite its , it is not native to the Americas. It is a significant pest in human structures worldwide, particularly in food preparation and storage areas. The species has been extensively used in scientific research, including studies on olfaction, neurobiology, and . At UC Davis, it serves as the featured athlete in the Roach Races, a popular public engagement event held during Picnic Day since 1992.

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Pronunciation

How to pronounce Periplaneta americana: /ˌpɛrɪpləˈniːtə əˌmɛrɪˈkeɪnə/

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

Identification

Distinguished from the oriental cockroach (Blatta orientalis) by its larger size, fully developed wings in both sexes, and reddish-brown rather than black coloration. Separated from the smokybrown cockroach (Periplaneta fuliginosa) by the yellow pronotal margin versus uniform dark coloration. Differs from the Turkestan cockroach (Shelfordella lateralis) by greater size and lack of pale wing stripes in males. The German cockroach (Blattella germanica) is much smaller (13-16 mm) with two dark longitudinal stripes on the pronotum.

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Appearance

measure 35-40 mm in length, making them the largest common . The body is reddish-brown with a yellowish margin on the pronotum behind the . Both sexes possess fully developed wings that extend beyond the ; males have wings slightly longer than females. The at the abdomen tip are long and thread-like. Nymphs are wingless and progressively darken through .

Habitat

Primarily associated with human structures, especially in warm, moist environments. Common in sewers, steam tunnels, basements, and around pipes in commercial buildings. In warmer climates, establish outdoors in leaf litter, mulch, and tree holes. Requires temperatures above 15°C for sustained activity; optimal range 25-30°C.

Distribution

distribution via human commerce. Native range thought to be tropical Africa; introduced to the Americas and now worldwide in tropical and temperate regions. Established throughout the United States, particularly in southern states and urban centers with heated infrastructure. Records from 66 countries including Algeria, Argentina, Australia, Brazil, China, Egypt, India, Japan, Mexico, South Africa, and across Europe.

Seasonality

Active year-round in heated indoor environments. Outdoor activity peaks during warm months in temperate regions. continuous under favorable temperature conditions; development slows below 20°C.

Diet

scavenger. Consumes decaying organic matter, food scraps, paper products, book bindings, and dead insects. Has been observed feeding on fermented materials. Can survive extended periods without food but requires water more frequently.

Life Cycle

Development through : , nymph (13-16 instars), . Females produce () containing 14-16 eggs, deposited in sheltered locations 1-2 days after formation. Ootheca carried by female for several days before deposition. Nymphal development spans 6-12 months depending on temperature and nutrition. Adults live 1-2 years under favorable conditions; females may produce 150-200 offspring in lifetime.

Behavior

, with peak activity 2-4 hours after darkness. Strong negative ; rapid escape response to light exposure. Capable of running at speeds exceeding 5 km/h. and large nymphs can climb smooth vertical surfaces using tarsal . Weak fliers; glide from heights rather than sustained . Aggregates in harborages with conspecifics, mediated by in .

Ecological Role

Decomposer in natural and urban , processing organic detritus. Serves as prey for spiders, amphibians, reptiles, birds, and small mammals. In laboratory settings, provides a model organism for neurobiological and physiological research, particularly in studies of insect olfaction and chemoreception.

Human Relevance

Major pest of food service, healthcare, and residential facilities. Contaminates food and surfaces with and allergens; and shed skins trigger asthma in sensitive individuals. Subject of extensive urban pest management programs. Used in the UC Davis Roach Races, an public science outreach event since 1992. Featured in international olfaction research symposiums as a model for insect chemosensory studies.

Similar Taxa

Misconceptions

Despite the , not native to North America. Frequently misidentified as the palmetto bug (Eurycotis floridana), a distinct . Not a true waterbug ( Belostomatidae), though often colloquially called such. The name 'Bombay canary' derives from its introduction to western ports via shipping, not from any vocalization.

More Details

Research significance

One of the most studied insect in neurobiology; its and olfactory system serve as models for understanding insect chemoreception. Featured in the 2021 international symposium 'Insect Olfaction and Taste in 24 Hours Around the Globe' hosted by UC Davis.

UC Davis Roach Races

public engagement event since 1992, initiated by postdoctoral researcher Steve Schutz based on a tradition from Rutgers University. Races held on 1.5-yard wooden tracks with colored lanes; roaches start from gated chambers and are prompted by air puffs. Event draws thousands of spectators to Briggs Hall during Picnic Day.

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Sources and further reading