Credit: Dr. Hiroki Obata
Scanning electron microscope (SEM) images and illustrations of cast cockroach egg case impressions from Japanese archaeological sites. a: SEM images, a’: illustrations of SEM images, b: locations of impressions, c: illustration of the inner part of the modern smokybrown cockroach (Periplanata fuliginosa) egg casing. ※White bars without numbers indicate 1 mm.