Blattella -

: 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.

Blattella species are not just a nuisance; they are significant medical and public health concerns. blattella

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

: Upon hatching, nymphs undergo six growth stages, known as instars , before reaching adulthood. : They act as mechanical vectors for bacteria

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

: The German cockroach is easily identified by two dark, longitudinal stripes on its pronotum (the shield-like structure behind the head).

One reason the genus is so dominant as a pest is its prolific reproductive rate. According to the LSU AgCenter , the entire life cycle of B. germanica can be completed in just 100 days.