About Neostylopyga rhombifolia (Stoll, 1813)
Neostylopyga rhombifolia, commonly known as the harlequin roach, is a flightless cockroach species belonging to the family Blattidae. This is a synanthropic species that is often found inside human homes, and it is usually classified as a pest. It has been introduced to tropical and subtropical regions worldwide through human trade activity. Its original native geographic range is not confirmed, but researchers think it originates from somewhere in tropical Asia. Adult harlequin roaches measure approximately 20 to 27 mm (0.79 to 1.06 inches) in length. Both male and female harlequin roaches are flightless. They have no hindwings, and their forewings, called tegminia, are reduced to form two small lobes. Both sexes also have a distinctive black and yellow body pattern. Females are generally larger and stouter in build than males. Because of their striking coloration, harlequin roaches are kept as popular pets. This species produces a strong-smelling chemical called amyl acetate for defense; the scent of this chemical has been compared to almond, cherry, pear, or banana extracts. The full mitochondrial genome of the harlequin roach was sequenced in 2016.
