Understanding Blattella : The Science and Impact of the Modern Cockroach

: Most have a flattened, oval-shaped body, which is a trait shared by nearly all cockroaches to help them navigate tight crevices.

: Upon hatching, nymphs undergo six growth stages, known as instars , before reaching adulthood.

: They act as mechanical vectors for bacteria like Salmonella , E. coli , and Shigella flexneri . They are also known carriers of human intestinal parasites.

Blattella species are typically small, generally ranging from 10 to 15 mm in length.

: Females produce an egg case called an ootheca, which they carry attached to their abdomen until just before the nymphs hatch. Each case can contain between 25 and 43 eggs.

: Research has shown that reproduction and development are often "socially facilitated," meaning they grow faster and reproduce more effectively when in groups. Health Risks and Vector Potential