Pest Organisms / German Cockroach
Biology
for German Cockroach
The insect grows through three stages: egg, nymph, then adult. Each egg case holds roughly 30 to 40 eggs, and the female carries it — the ootheca — until the eggs are about to hatch. From egg to adult takes around 100 days, and because German cockroaches breed without pause, several overlapping generations are usually present at once; in favorable conditions their numbers have been shown to grow exponentially. Source: https://ask.ifas.ufl.edu/publication/IN128
ITIS files the species under the family Blattellidae, whereas a good deal of recent literature uses Ectobiidae instead. Source: https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=Scientific_Name&search_value=Blattella+germanica