Indian Spotted Cockroaches (Therea petiveriana), more commonly known as Domino Cockroaches, are one of the few roach species that genuinely changes people's minds about cockroaches. With their striking black bodies covered in crisp white spots—looking exactly like domino tiles—they're about as far from the common house roach as you can get. Native to southern India, these are beautiful, easy-to-keep roaches that make excellent display animals and great beginner species.
What makes them particularly interesting is that their bold pattern isn't just for show. They've evolved to mimic the aggressive ground beetle Anthia sexguttata, which can spray chemical irritants at predators. By copying this beetle's appearance, Domino Cockroaches benefit from predators' learned avoidance—a clever bit of evolutionary trickery called Batesian mimicry.
Fair warning if you're buying nymphs: they don't look like much at first. Juveniles are plain brown and spend most of their time burrowed in the substrate. The dramatic black-and-white transformation only happens when they reach adulthood. But once they do, you'll understand why these are one of the hobby's most popular display roaches.
A Glimpse
-
Origin: Southern India & Sri Lanka
-
Scientific Name: Therea petiveriana
-
Common Names: Domino Cockroach, Seven-spotted Cockroach, Desert Cockroach
-
Difficulty Level: Easy
-
Size: Males ~25mm, Females ~35mm
-
Temperature: 21-29°C (70-85°F)
-
Humidity: 40-60% (air), moist substrate
-
Rarity: Common
-
Favourite Foods: Leaf litter, vegetables, fruits, protein supplements
Overview
Therea petiveriana belongs to the family Corydiidae and is considered one of the more "basal" or primitive cockroach groups. They're found in scrub forest habitats in southern India, where they spend the heat of the day burrowed under leaf litter or loose soil, emerging at dawn and dusk (crepuscular activity) to forage.
The species has been popular in the hobby for decades, though there's an interesting taxonomic note: in 2009, researchers suggested that most captive stock might actually be a separate species, Therea bernhardti, rather than true T. petiveriana. The two are visually similar and require identical care, so for practical purposes it doesn't change how you keep them. But if you're a stickler for taxonomy, it's worth knowing.
One of their most appealing features for display purposes is that adult males are often quite active during the day, running around on top of the substrate rather than hiding. This makes them much more visible than many roach species that only emerge at night. Females tend to be shyer and more inclined to burrow, but you'll still see them regularly.
Appearance and Behaviour
The transformation from nymph to adult is dramatic. Nymphs are solid brown with fine hairs giving them a slightly fuzzy appearance—they look like ordinary roach nymphs and spend nearly all their time underground. Adults emerge with that spectacular black-and-white domino pattern that makes the species famous.
Physical features:
- Adults: Glossy black with bold white spots arranged like domino tiles
- Females larger (up to 35mm) and broader than males (~25mm)
- Hidden orange-yellow colouring on upper abdomen (visible if they raise wings)
- Rounded, somewhat beetle-like body shape
- Nymphs: Plain brown, hairy, unremarkable until final moult
Behavioural traits:
- Crepuscular—most active at dawn and dusk, though adults often visible during the day
- Strong burrowing instinct, especially nymphs and females
- Adults can climb smooth surfaces; nymphs cannot
- Cannot fly despite having wings
- When disturbed, may raise wings and release alarm pheromones
- Social—do best in groups rather than kept alone
- Generally calm and tolerant of handling
Their calm nature and inability to fly or jump makes them suitable for handling and even appropriate for supervised interaction with children. They don't exhibit the frantic escape behaviour common to many roach species.
Basic Care
Domino Cockroaches are genuinely easy to keep, making them an excellent choice for beginners or anyone wanting a low-maintenance display species.
Temperature: Keep them between 21-29°C (70-85°F). They'll tolerate room temperature in most UK homes, but growth and breeding activity increases at warmer temperatures (24-29°C). Below 21°C they'll slow down significantly; below 18°C isn't recommended.
Humidity: They come from temperate rather than tropical climates, so they don't need high humidity. Air humidity of 40-60% is fine. However, they do need moist substrate—particularly for females to lay egg cases. Create a moisture gradient with damper areas at the bottom/back of the enclosure.
Ventilation: Moderate to high ventilation is important. Good airflow helps prevent stagnant conditions. Our screw-in air vents work well for creating proper ventilation in plastic tubs.
Substrate depth: Provide at least 5-8cm (2-3 inches) of substrate. Nymphs are dedicated burrowers and will spend the vast majority of their time underground—in the wild they can burrow up to 30cm deep during dry seasons. Adequate depth is essential for their wellbeing.
Climbing: Adults can climb glass and smooth plastic, so you'll need an escape-proof lid. A thin band of petroleum jelly around the top rim provides extra security. Nymphs cannot climb smooth surfaces, so they're not an escape risk.
Feeding
Domino Cockroaches are detritivores that primarily feed on decaying plant matter. They're not fussy eaters, though leaf litter should form the foundation of their diet.
Primary foods (always available):
- Decaying hardwood leaf litter (oak is excellent)
- This should always be present—nymphs especially will consume it continuously
Supplementary foods:
- Vegetables: carrot, potato, sweet potato, courgette
- Fruits: apple, orange, banana (for moisture as well as nutrition)
- Protein: fish flakes, fish food pellets, bee pollen, dog/cat kibble
- Insect jelly—clean, doesn't spoil, reportedly well-received
Calcium: While not as calcium-demanding as some invertebrates, providing cuttlebone or crushed eggshells supports healthy moulting.
They have symbiotic gut bacteria and flagellates (similar to termites) that help them digest cellulose from decaying plant matter. This makes leaf litter not just a food source but essential for their digestive health.
Habitat
A 10-gallon enclosure is sufficient for a well-established colony. Smaller containers (around 4 litres) work fine for starter cultures of 5-10 individuals.
Key requirements:
- Secure, escape-proof lid (adults climb)
- Deep substrate (5-8cm minimum) for burrowing
- Layer of leaf litter on top of substrate
- Cork bark pieces—provide climbing opportunities for males and additional cover
- Branches or fake plants for adult males to explore (optional but appreciated)
- Moisture gradient in substrate
- Good ventilation
Unlike many roach species that need extensive hiding spots, Domino Cockroaches don't require elaborate hides since nymphs and females naturally burrow into the substrate. Adult males will appreciate some climbing surfaces and bark pieces, but the enclosure can be relatively simple.
Substrate Mix
A moisture-retentive substrate that supports burrowing is essential. Avoid sand—it's not suitable for this species.
Recommended mix:
- Coconut fibre (coir) as a base
- Organic potting soil or peat moss mixed in
- Optional: cypress mulch for texture
- Generous layer of hardwood leaf litter on top
Create a moisture gradient by keeping the substrate damper at one end (where it's deepest) and drier toward the surface at the other end. The damp areas are where females will deposit their egg cases. Mist when the top few inches dry out, but don't waterlog the substrate.
Breeding
Domino Cockroaches breed readily in captivity once their basic needs are met. They're oviparous—females produce oothecae (egg cases) rather than giving birth to live young.
Breeding characteristics:
- Females produce up to 13 oothecae over their lifetime
- Each ootheca contains 6-14 nymphs (some sources report up to 20-30)
- Oothecae are deposited in moist leaf litter
- Incubation takes approximately 2-3 months depending on temperature
- Newborn nymphs are tiny (around 3mm—sesame seed sized)
- Nymphs develop over several months before reaching adulthood
Breeding tips:
- Ensure moist leaf litter is available—essential for egg deposition
- Maintain humidity to prevent oothecae from drying out
- Warmer temperatures (24-29°C) speed up development
- Keep them in groups—they're social and breed better with company
- Be patient—nymphs take several months to mature
Once established, colonies can become quite prolific. Since adults only live a few months while nymphs take longer to mature, you'll want to maintain overlapping generations to ensure there are always adults in the enclosure for display.
Interesting reproductive note: once a female has mated, she actively rejects other males, kicking them away with her hind legs. One mating is apparently sufficient.
Display Value
Domino Cockroaches are considered one of the best display roach species available:
- Adults (especially males) are often visible during the day
- Striking appearance that draws attention
- Calm temperament allows for observation without them fleeing
- Active enough to be interesting but not frantic
- Work well in bioactive setups alongside springtails and isopods
- Safe for children to observe and handle (supervised)
They're one of the few roach species that non-enthusiasts genuinely find attractive. If you want to change someone's mind about cockroaches, showing them an adult Domino Cockroach is a good place to start.
Who Are These Roaches For?
Domino Cockroaches suit:
- Complete beginners to exotic roach keeping
- Anyone wanting an attractive, visible display species
- Keepers who want low-maintenance insects
- Families with children interested in invertebrates
- Bioactive setup enthusiasts
- People who want to challenge negative perceptions of cockroaches
They're not ideal if:
- You want instant visual impact—nymphs are plain brown
- You're expecting to see them constantly (they do burrow)
- You need fast-breeding feeder colonies (there are better options)
Domino Cockroaches have earned their reputation as the "gateway roach" that gets people interested in keeping cockroaches. They're beautiful, easy to care for, breed readily, and have enough interesting biology (beetle mimicry, crepuscular activity, burrowing behaviour) to keep you engaged. The wait for nymphs to mature into their adult colouration is worth it—there's something satisfying about watching that first plain brown nymph transform into a striking black-and-white adult.
