Oriental cockroach

Oriental cockroach
Oriental cockroach
A: Female
B: Male
C: Side view of female
D: Young male
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Blattodea
Family: Blattidae
Genus: Blatta
Species: B. orientalis
Binomial name
Blatta orientalis
Linnaeus, 1758

The oriental cockroach (also known as: waterbug and Blatta orientalis) is a large species of cockroach, measuring about 1 in (2.5 cm) in length at maturity. It is dark brown to black in colour and has a glossy body. The female Oriental cockroach has a somewhat different appearance to the male, appearing to be wingless at casual glance but has two very short and useless wings just below her head. She has a wider body than the male. The male has long wings, which cover a majority of his body and are brown in colour, and has a more narrow body. The odd male is capable of very short flights, ranging about 2 to 3 meters. The female oriental cockroach looks somewhat similar to the Florida woods cockroach, and may be mistaken for it.


The oriental cockroach tends to travel somewhat more slowly than other species. They are often called "waterbugs" since they prefer dark, moist places. They can often be found around decaying organic matter, and in sewers, drains, damp basements, porches, and other damp locations. They can be found outside in bushes, under leaf groundcover, under mulch, and around other damp places outdoors. It is a major household pest in parts of the northwest, mid-west, and southern United States[1].


In order to thrive, cockroaches need a place to hide. They prefer warm places and a relatively high humidity if possible; they also need a source of food/liquid. The optimum temperature for oriental cockroaches is between 20 °C (68 °F) to 29 °C (84 °F). Female oriental cockroaches have vestigial tegmina (reduced forewings) and males have longer tegmina. Cockroaches are mainly nocturnal. Oriental cockroaches can be elusive in that a casual inspection of an infested dwelling during the day may show no signs of roach activity.


Signs of cockroaches are their oothecae, which are “egg cases” containing up to 16 individual eggs in the case of oriental cockroaches. These oothecae are dropped by females and hatch on their own in about two months. Oriental cockroaches can be harder to get rid of than other roaches. Although adults can be fairly easily killed by the application of residual insecticide, the insecticides can get washed away, and two months later females can hatch new nymphs.

Comparison of three common roaches

Roach German cockroach Oriental cockroach American cockroach
Size 12 mm (1.2 cm) to 15 mm (1.5 cm) 25 mm (2.5 cm) to 30 mm (3.0 cm) 28 mm (2.8 cm) to 43 mm (4.3 cm)
Habitat Heated buildings, optimum 32 °C (90 °F) 20 °C (68 °F) to 29 °C (84 °F) Same as German
Nymphal development time 6 to 12 weeks 6 to 12 months 4 to 15 months
Life Span 6 to 9 months 1 to 1.5 years 1 to 1.5 years
Able to fly? No No Yes

Image gallery


  1. ^ [1]

External links

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Look at other dictionaries:

  • oriental cockroach — noun dark brown cockroach originally from orient now nearly cosmopolitan in distribution • Syn: ↑oriental roach, ↑Asiatic cockroach, ↑blackbeetle, ↑Blatta orientalis • Hypernyms: ↑cockroach, ↑roach …   Useful english dictionary

  • oriental cockroach — ori·en·tal cockroach .ōr ē ent əl , .ȯr n a dark or blackish brown medium sized cockroach (Blatta orientalis) prob. originating in Asia but now nearly cosmopolitan in warm and temperate areas esp. about dwellings called also oriental roach * * * …   Medical dictionary

  • oriental cockroach — a dark brown cockroach, Blatta orientalis, thought to have originated in the Orient but now nearly cosmopolitan in distribution. Also called oriental roach, blackbeetle. * * * …   Universalium

  • Cockroach — For other uses, see Cockroach (disambiguation). Cockroach Common household roaches A) German cockroach B) American cockroach C) Australian cockroach D E) Oriental cockroach (♀ & …   Wikipedia

  • cockroach — /kok rohch /, n. any of numerous orthopterous insects of the family Blattidae, characterized by a flattened body, rapid movements, and nocturnal habits and including several common household pests. Also called roach. Cf. American cockroach,… …   Universalium

  • oriental roach — noun dark brown cockroach originally from orient now nearly cosmopolitan in distribution • Syn: ↑oriental cockroach, ↑Asiatic cockroach, ↑blackbeetle, ↑Blatta orientalis • Hypernyms: ↑cockroach, ↑roach …   Useful english dictionary

  • cockroach — /ˈkɒkroʊtʃ / (say kokrohch) noun 1. any of various insects of the order Blattodea, usually nocturnal, and having a flattened body, especially the dark brown or black oriental cockroach, Blatta orientalis, a common household pest. 2. Colloquial a… …  

  • Asiatic cockroach — noun dark brown cockroach originally from orient now nearly cosmopolitan in distribution • Syn: ↑oriental cockroach, ↑oriental roach, ↑blackbeetle, ↑Blatta orientalis • Hypernyms: ↑cockroach, ↑roach …   Useful english dictionary

  • German cockroach — German cockroach/ Hood Scientific classification Kingdom: Animalia Phylum …   Wikipedia

  • Florida woods cockroach — Taxobox name = Florida woods cockroach image caption = Florida woods cockroach ( Eurycotis floridana )rfu c|2007 02 21 regnum = Animalia phylum = Arthropoda classis = Insecta ordo = Blattodea familia = Blattidae genus = Eurycotis species = E.… …   Wikipedia

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