
I recently purchased some Blaberus craniifer nymphs, and all are healthy and growing nicely, but one looks a bit different. Most are oval-shaped, not particularly shiny, have checker-stripes all the way across their abdomens, and are fairly plump. The outlier is almost completely round, very shiny, has markings only around the outside of its abdomen, and is flat despite usually hiding under something right next to the food. Also, it's more skittish than the rest. The other nymphs its size will sit semi-calmly in my hand, the outlier won't hold still or tolerate being in the light.
Is this just an oddly flat nymph, or could it possibly be a different variety?