Abstract
During the routine handling of a culture of Blaberus giganteus (Linn.) a nearly full-grown nymph with an asymmetrical abdomen (figures 1 and 2) was discovered. The anomaly consisted of a unilateral loss of the third abdominal segment from the left side. As can be seen from the photographs the third abdominal tergite and sternite are present on the right side only. Soon after the nymph was isolated it moulted to the last nymphal instar—presumably the sixth or seventh instar in this species, according to Nutting (1953)—at which time it was photographed by the junior author (figure 1). About 2 months later it emerged as an adult female with the anomaly still intact and unchanged.
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