Cockroach

Cockroach

Blattaria or Blattodea is an order of insects whose representatives are popularly known as cheap. It is a cosmopolitan group, and some species (less than 1%) are considered synanthropic. Among the main problems that cockroaches can cause to humans is their role as mechanical vectors of many pathogens (bacteria, fungi, protozoa, worms and viruses). Domestic cockroaches are responsible for the transmission of various diseases through the paws and feces by where pass. So they are considered hazardous to human health.

Among the best known species are the American cockroach, Periplaneta americana, measuring about 30 millimeters in length, the cockroach, German, Blattella germanica, about 15 mm long, the cockroach, Oriental, Blattella asahinai, also about 15 mm long, and oriental cockroach with about 25 millimeters. Tropical cockroaches are often much larger, and the cheap extinct relatives are 'roachoids' as the Carboniferous and Permian Archimylacris Apthoroblattina that were not as large as the largest modern species.

Existing for over 300 million years, cockroaches now total about 5,000 species in the world. The cheapest of the body has ovular shape and depressed. Their size may vary from a few millimeters to almost 10 centimeters. The head is short, subtriangular, with large compound eyes and usually two ocelli (simple eyes). In general they are brown, brown or black color, but there are colorful species. In tropical areas, dominated by reddish brown color, in addition to the green and yellow colors.

The shape and size vary depending on the species, but gender can say that females are larger than males, but males have more developed wings. The power is varied. Cockroaches are omnivorous insects, or eat anything, and main attraction for sweets, fatty foods and animal. A curiosity is that they can live a week without drinking water, up to a month without eating and also weeks without cabeça.Conseguem realize the danger through changes in the current of air around. They have small hairs on the back that act as sensors, telling the time to run.