American cockroach
An American cockroach in action - first in real time, then slowed down to one-tenth speed
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Blattodea
Family:	Blattidae
Genus:	Periplaneta
Species:	P. americana
Binomial name
Periplaneta americana (Linnaeus, 1758)
Synonyms
Blatta americana Linnaeus, 1758 Blatta ferrugineofusca Gronovius, 1764 Blatta kakkerlac De Geer, 1773 Blatta orientalis Sulzer, 1776 (Preocc.) Blatta aurelianensis Fourcroy, 1785 Blatta siccifolia Stoll, 1813 Blatta heros Eschscholtz, 1822 Blatta domicola Risso, 1826 Periplaneta stolida Walker, 1868 Periplaneta colorata Rehn, 1901

The American cockroach (Periplaneta americana) is the largest species of common cockroach, and often considered a pest. In certain regions of the U.S. it is colloquially known as the waterbug,^[1] though it is not a true waterbug since it is not aquatic. It is also known as the ship cockroach, kakerlac, and Bombay canary.^[2] It is often misidentified as a palmetto bug.^[3][4]

Despite their name, American cockroaches are native to Africa and the Middle East. They are believed to have been introduced to the Americas only from the 17th century AD onward as a result of human commercial patterns,^[2] including the Atlantic slave trade.^[5]

Despite the name, none of the Periplaneta species is native to the Americas; P. americana was introduced to what is now the United States from Africa as early as 1625.^[2] They are now common in tropical climates because human activity has extended the insects' range of habitation, and are virtually cosmopolitan in distribution as a result of global commerce.^[2]

Of all common cockroach species, the American cockroach has the largest body size; molts 6–14 times (mostly 13 times) before metamorphosis; and has the longest life cycle, up to about 700 days.^[6]

It has an average length around 4 cm (1.6 in) and is about 7 mm (0.28 in) tall.^[7] They are reddish brown and have a yellowish margin on the pronotum, the body region behind the head. Immature cockroaches resemble adults except they are wingless.

The cockroach is divided into three sections; the body is flattened and broadly oval, with a shield-like pronotum covering its head. A pronotum is a plate-like structure that covers all or part of the dorsal surface of the thorax of certain insects. They also have chewing mouth parts, long, segmented antennae, and leathery fore wings with delicate hind wings. The third section of the cockroach is the abdomen.^[8]

The insect can travel quickly, often darting out of sight when a threat is perceived, and can fit into small cracks and under doors despite its fairly large size. It is considered one of the fastest running insects.^[9]

In an experiment, a P. americana registered a record speed of 5.4 km/h (3.4 mph), about 50 body lengths per second, which would be comparable to a human running at 330 km/h (210 mph).^[10][11]

It has a pair of large compound eyes, each having over 3500 individual lenses (ommatidia, hexagonal apertures which provide a kind of vision known as mosaic vision, with more sensitivity but less resolution, particularly useful at night, hence called nocturnal vision). It is a very active night insect that shuns light.^[12]

American cockroach nymphs are capable of limb regeneration.^[6]

The American cockroach shows a characteristic insect morphology with its body bearing divisions as head, trunk, and abdomen. The trunk, or thorax, is divisible into prothorax, mesothorax and metathorax. Each thoracic segment gives rise to a pair of walking appendages (known as cursorial legs). The organism bears two pairs of wings. The fore wings, known as tegmina, arise from mesothorax and are dark and opaque. The hind wings arise from the metathorax and are used in flight, though cockroaches rarely resort to flight. The abdomen is divisible into 10 segments, each of which is surrounded by chitinous exoskeleton plates called sclerites, including dorsal tergites, ventral sternites, and lateral pleurites.

American cockroaches have three developmental stages: egg, nymph, and adult.^[13] Females produce an egg case (ootheca) which protrudes from the tip of the abdomen. On average, females produce 9–10 oothecae, although they can sometimes produce as many as 90. After about two days, the egg cases are placed on a surface in a safe location. Egg cases are about 0.9 cm (0.35 in) long, brown, and purse-shaped. Immature cockroaches emerge from egg cases in 6–8 weeks and require 6–12 months to mature. After hatching, the nymphs feed and undergo a series of 13 moultings (or ecdysis). Adult cockroaches can live up to an additional year, during which females produce an average of 150 young. The American cockroach reproductive cycle can last up to 600 days.^[6]

The sex pheromone of the American cockroach is the sequiterpene (1Z,5E)-1,10(14)-diepoxy-4(15),5-germacradien-9-one, which has been given the trivial name periplanone-B. This pheromone was isolated from the feces of virgin female cockroaches. Previously, 2,2-dimethyl-3-isopropylidenecyclopropyl propionate had been thought to be the structure of this pheromone, but on synthesis was shown to be inactive. The structure determination of this pheromone was an eventful chapter in the history of pheromone chemistry. ^[14]

When female American cockroaches are housed in groups, this close association promotes facultative parthenogenic reproduction.^[6][15] The oothecae are produced asexually, without fertilization.^[15] The process by which the eggs are produced is automixis;^[16] during automixis, meiosis occurs, but instead of giving rise to haploid gametes as ordinarily happens, diploid gametes are produced (probably by terminal fusion of meiotic products) that can then develop into female cockroaches. Eggs produced by parthenogenesis have lower viability than eggs produced by sexual reproduction.^[15]

The American cockroach genome is the second-largest insect genome on record, after Locusta migratoria. Around 60% of its genome is composed of repeat elements. Around 90% of the genome can be found in other members of Blattodea. The genome codes for a large number of chemoreceptor families, including 522 taste receptors and 154 olfactory receptors. The 522 taste receptors comprise the largest number found among insects for which genomes have been sequenced. About 329 of the taste receptors are involved in bitter taste perception.^[6] These traits, along with enlarged groups of genes relating to detoxification, the immune system, and growth and reproduction, are believed to be part of the reasons behind the cockroach's ability to adapt to human living spaces.^[17]

American cockroaches are omnivorous and opportunistic feeders that eat materials such as cheese, sweets, beer, tea, leather, bakery products, starch in book bindings, manuscripts, glue, hair, flakes of dried skin, dead animals, plant materials, soiled clothing, and glossy paper with starch sizing.^[2][13] They are particularly fond of fermenting foods.^[18] They have also been observed to feed upon dead or wounded cockroaches of their own or other species.

In the immature (nymph) stage, American cockroaches are wingless and incapable of flight. Adults have useful wings and can fly for short distances. If they start from a high place, such as a tree, they can glide for some distance. However, despite their ability to do so, American cockroaches aren't regular fliers. They can run very fast and, when frightened, these insects more commonly scatter on foot.

American cockroaches generally live in moist areas but can survive in dry areas if they have access to water. They prefer high temperatures around 29 °C (84 °F) and do not tolerate low temperatures. These cockroaches are common in basements, crawl spaces, cracks and crevices of porches, foundations, and walkways adjacent to buildings. In residential areas outside the tropics, these cockroaches live in basements and sewers and may move outdoors into yards during warm weather.

The odorous secretions produced by American cockroaches can alter the flavor of food. Also, if populations of cockroaches are high, a strong concentration of this odorous secretion can be present.^[13] Cockroaches can pick up disease-causing bacteria,^[19] such as Salmonella, on their legs and later deposit them on foods and cause food poisoning or infection if they walk on the food. House dust containing cockroach feces and body parts can trigger allergic reactions and asthma in certain individuals.^[20]

At least 22 species of pathogenic human bacteria, viruses, fungi, and protozoans, as well as five species of helminthic worms, have been isolated from field-collected P. americana (L.)^[21]

In cold climates, these cockroaches may move indoors, seeking warmer environments and food. Cockroaches may enter houses via wastewater plumbing, underneath doors, or via air ducts or other openings in the walls, windows or foundation. Cockroach populations may be controlled through the use of glue board traps^[22] or insecticides. Glue board traps (also called adhesive or sticky traps) are made using adhesive applied to cardboard or similar material. Bait can be placed in the center or a scent may be added to the adhesive. Inexpensive glue board traps are normally placed in warm indoor locations readily accessible to insects but not likely to be encountered by people: underneath refrigerators or freezers, behind trash cans, etc.^[23]

Covering any cracks or crevices through which cockroaches may enter, sealing food inside insect-proof containers, and quickly cleaning any spills or messes that have been made is beneficial. Another way to prevent an infestation is to thoroughly check any materials brought inside: cockroaches and their egg cases (ootheca) can be hidden inside or on furniture, or inside boxes, suitcases, grocery bags, etc. Upon finding an egg case, use a napkin to pick it up and then forcefully crush it; the resulting fluid leakage will then indicate the destruction of the eggs inside. Discard the napkin and the destroyed egg case as garbage.^[13]

The American cockroach has been used as an ingredient in traditional Chinese medicine, with references to its usage in the Compendium of Materia Medica and Shennong Ben Cao Jing. In China, an ethanol extract of the American cockroach, Kāngfùxīn Yè (康复新液), is prescribed for wound healing and tissue repair.^[6]

Wikimedia Commons has media related to Periplaneta americana.

• An Ohio State University Entomology article on the American cockroach (PDF)
• Friday Fellow: American Cockroach at Earthling Nature
• Gallery of cockroaches
• Order Blattodea, Exploring California Insects
• University of Minnesota Extension - Cockroaches article
• American cockroach egg parasitoid on the UF/IFAS Featured Creatures website