Domino/Question Mark Roach (Therea petiveriana, T. regularis, T. olegrandjeani)
Size
T. petiveriana (Domino)
Females up to 35mm (1.4in)
Males up to 25mm (0.9in)
T. regularis (Orange Domino)
Females up to mm (in)
Males up to mm (in)
T. olegrandjeani (Question Mark)
Females up to mm (in)
Males up to mm (in)
Moisture
50% humidity
Keep the substrate damp, not wet, with average water content. Allow the top layer of substrate to dry out before adding more water. Directly add water to the soil to re-hydrate your roach bin. Give them a wetter and a dryer side to their enclosure to allow a moisture gradient. Additional water can be provided through food. There should be enough ventilation to make sure the soil is able to dry, and it shouldn't be too humid.
Temperature
22-29.5°C (72-85°F)
The warmer they are, the quicker they grow.
Sexing
At adulthood, males have longer hairy antennae, while females have short straight antennae.
Lifespan
These roaches are slow growers. If kept at ~75°F it may take them 1.25-2 years to grow from birth to adulthood. If kept much warmer, they can mature in ~6-8 months. Adults can sometimes live for as long as 6 months past adult molt.
Feeding
These insects feed primarily on dried leaves, but love small bits of protein-based pet foods. I offer a variety of kitchen scraps such as apples, bananas, carrots, potato/sweet potato, celery, romaine lettuce, beet greens, cabbage, broccoli and other fruits and veggies. A thick layer of leaf litter should always be available to your dominos and replaced when consumed. I mainly use oak leaves that I personally collect and sell too. Offer cuttlebone chunks for calcium.
Enclosure
I use a large sealed plastic Sterelite Gasket Box with one large hole cut for ventilation covered by windowscreen at the top. I have a petrolium jelly barrier to keep in the adults. Domino roaches need several inches of substrate as they are a burrowing roach. I use organic peat or flake soil with added leaves, sphagnum moss and charcoal. You could additionlly add coco choir for slightly more water retention. I provide my dominos with substrate at least 4 inches deep. Make sure whatever container/setup you use is deep enough for burrowing. I have bark chunks set on top of the substrate, under the leaf litter for extra cover.
Breeding
Females will breed with a male and proceed to kick away other potential suitors. Females are oviparous and will produce as many as 13 ootheca that will each yield as many as 16 nymphs.
Other Information
These roaches are beetle mimics! Nymphs and adults stay round and clumsy. They're often burrowed in the substrate, so you may not see them much. Domino roaches get their names from their adult forms' signature black and white spotted wings. They cannot fly.