cockroach

cockroach or roach, name applied to approximately 3,500 species of flat-bodied, oval insects forming the order Blattodea. Cockroaches have long antennae, long legs adapted to running, and a flat extension of the upper body wall that conceals the head. They range from 1-4 in. to 3 in. (.6–7.6 cm) in length. Some cockroaches have two pairs of well-developed wings, the front pair covering the hind pair when at rest; others have reduced wings or none at all. In some species only the wings of the female are reduced or absent. Many species are able to fly well, although the familiar household species do not fly. Most cockroaches are shiny brown or black, but bright yellows, reds, and greens occur in some tropical species.

Cockroaches are night-active insects and most live in damp places; most are omnivorous scavengers. They are worldwide in distribution but are most numerous in the tropics. Most species live in the wild in their native regions, e.g., the wood cockroaches, species of the genus Parcoblatta, found under forest litter in the NE United States.

A few tropical and subtropical species that have been introduced into the temperate zone have become residents in human homes, where they multiply rapidly and are serious pests. They invade food supplies and emit foul-smelling glandular secretions. Their shape enables them to use tiny cracks as hiding places. They are popularly believed to be carriers of human diseases, although this has not been proved.

Cockroaches reproduce sexually. Their eggs are encased in capsules called oothecae, which in some species remain attached to the abdomen of the female until the eggs hatch. In a few species the ootheca is retained within the body of the female and the young are born live. Young resemble the adults except in size.

The large, dark Oriental cockroach, Blatta orientalis, is a cosmopolitan household species. The smaller German cockroach, or Croton bug, Blattella germanica, native to Europe, is the common urban cockroach of the NE United States. The American cockroach, Periplaneta americana, is a large light-reddish species that invades houses in the S United States.

The group as a whole is extremely old; fossil evidence indicates its extreme abundance during the Carboniferous period, about 350 million years ago. These ancient cockroaches were able to fly and were probably the first flying animals. Cockroaches are classified in five families of the phylum Arthropoda, class Insecta, order Blattodea.

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cockroach

 or roach

Female cockroach (Periplaneta)

(credit: Colin Butler—Bruce Coleman Ltd.)

Any of more than 3,500 insect species (in suborder Blattaria, order Dictyoptera) that are among the most primitive living, winged insects and among the oldest (more than 320 million years old) fossil insects. Cockroaches have a flattened, oval body; long, threadlike antennae; and a shining, leathery, black or brown covering. They prefer a warm, humid, dark environment and are usually found in tropical or other mild climates, but have become widespread in heated buildings, especially city apartment buildings, in the temperate zone, and infestations can be severe. Only a few species have become pests. Cockroaches eat both animal and plant material. The American cockroach is up to about 2 in. (30–50 mm) long. The German cockroach (less than 0.5 in., or about 12 mm, long) is a common household pest which has been spread throughout the world by ship.

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cockroach

any insect of the suborder Blattodea (or Blattaria), such as Blatta orientalis (oriental cockroach or black beetle): order Dictyoptera. They have an oval flattened body with long antennae and biting mouthparts and are common household pests