Overview
The Double Shield Mantis (Pnigomantis medioconstricta) is the bruiser of the species we work with. Native to Flores Island, Indonesia, it gets its name from the unusual constricted pronotum that creates two shield-like sections — a profile not seen on any other mantis in the trade.
Adults are stocky and mottled in browns and grays, with bright blue inner-arm markings that flash during threat displays. Females reach about 9 cm; males about 8 cm. Both sexes are stocky — unlike most mantises, the male isn’t a slender version of the female, which makes sexing by build unreliable. Count abdominal segments instead.
Two things distinguish husbandry of this species:
- Among the longest-lived mantises in the trade. 12 months is typical, 18 is achievable. Far above the 6-month average for most species.
- Notoriously cannibalistic. Males are routinely consumed during pairing — plan for it. Even nymph-on-nymph cannibalism is severe.
Care lands at beginner, surprisingly, because of the broad temperature tolerance and aggressive feeding response. This is “beginner with a side of attitude.”
What a nymph actually looks like
The double shield the species is named for doesn’t appear until roughly the fifth instar. Young nymphs are plain brown and look like any other mantis. The constricted pronotum and the blue inner-arm markings develop with maturity, so a nymph that looks unremarkable is on schedule, not mislabelled.
Enclosure
Solo housing throughout life. No exceptions.
- L1–L2: 32-oz deli cup, mesh top.
- L3–L4: 64-oz cup or 6×6×8 inch acrylic.
- L5–L6: 8×8×12 inch.
- L7–L8: 10×10×16 inch minimum.
- Adult (L9 female / L8 male): 12×12×18 inch. Adult females are bulky and need room.
Substrate: 1–2 inches of slightly moistened coco fiber.
Decor: cork bark, sturdy twigs, occasional silk leaves. Adults are heavy and will break flimsy decor — use thicker branches than you would for an Orchid or Spiny Flower. For a full walkthrough of substrate, ventilation, and decor, see our praying mantis terrarium setup guide.
Ventilation: mesh top + screen panel.
Temperature & humidity
Target 72–86°F, 50–60% humidity, with a tolerated floor of 68°F. The wide temperature tolerance is what makes them forgiving.
Heating: optional unless your home is below 68°F. They thrive at room temperature.
Humidity: light daily mist or every-other-day mist. They’re tolerant of moderate dryness — don’t over-mist.
Diet & feeding
Aggressive eaters at every life stage. Will accept almost any prey that fits in the strike zone.
- L1–L2: Melanogaster fruit flies. 5–7 per feeding, every 1–2 days.
- L3–L4: Hydei fruit flies, small houseflies, dubia pinheads. 4–5 per feeding every 2 days.
- L5–L6: Houseflies, bottle flies, small dubia. 2–3 per feeding every 2 days.
- L7+: Bottle flies, medium-large dubia. 1–2 prey items every 3 days.
The rule behind the list: keep prey to no more than a third of the mantis’s body length. The species above are what we feed, but you’ll meet insects we haven’t named — a moth off the porch light, an oversized dubia, whatever the shop had. Size is what decides whether it’s safe, not what it is. Err smaller: a too-small prey item is a non-event, a too-large one risks injury. Our feeding guide has the sizes worked out centimetre by centimetre.
Adult females can physically take a pinky mouse, and you’ll see it done online. We don’t recommend it: a live rodent bites back, and the injury risk isn’t worth it for an animal that does perfectly well on insects.
Adult females in particular have the strike force to take down prey larger than a typical mantis would attempt. Don’t take this as an invitation to overfeed — obese mantises die during molts.
Lifecycle & molting
Females: 9 instars. Males: 8 instars. Total nymph development: 5–7 months. Adult (post-final-molt) lifespan: 6–9 months; total lifespan from hatch: 12–18 months (longest of any species we keep).
Premolt signs:
- Refusal of prey 24–48 hours
- Hanging upside-down
- Slight body darkening
Molts are reliable in this species. The thicker exoskeleton means slightly higher humidity helps during the molt itself — mist the walls when you spot a premolt animal. If a molt goes wrong, our guide to praying mantis molting problems covers the common causes and fixes.
Sexing
Reliable by L4:
- Females: 6 abdominal segments from below. Stocky, broader pronotum.
- Males: 8 abdominal segments. Slimmer body, longer antennae.
Adult size difference is modest — females run about 10% longer than males, not the dramatic gap seen in most species.
Breeding
Plan carefully. Cannibalism during pairing is severe with this species — losing the male is the expected outcome, not a worst case.
- Use a 12×12×16+ enclosure for pairing.
- Feed the female heavily for 3–4 days before introduction.
- Introduce the male from far behind the female; do not let him climb onto her body until she has acclimated for at least an hour.
- Pairing lasts 8–24 hours.
- Separate the male the moment dismount occurs — do not delay.
Always have backup males. It is normal to lose 1–3 males per successful pairing.
Females lay 2–6 substantial oothecae across their long adult life. Each yields 60–100 nymphs at 78–82°F and 60% humidity, hatching in 6–10 weeks (longer than most species). Culture your fruit flies accordingly — a hatch of a hundred cannibalistic nymphs with nothing to eat goes badly fast.
Ready to buy a Double Shield Mantis? We breed Pnigomantis medioconstricta year-round in Las Vegas. See current availability →
Common issues
- Lost male during pairing: expected. Have backup males.
- Slow nymph development: below 72°F slows them dramatically; below 68°F can stall them. Bump temp.
- Dropped limbs after molt: insufficient hanging height. Increase enclosure vertical clearance for next instar.
- Adult female refusing prey for weeks: if she’s gravid and has been laying, this is normal. If she hasn’t laid, check temperature.
Frequently Asked Questions
Anything special about molting a Double Shield?
Two things. Like other broad-shouldered species, that wide pronotum needs extra clearance to pull free — give more height than the 3× baseline — and the thicker exoskeleton molts more cleanly with a bit more humidity, so mist the walls (never the mantis) when you spot a premolt animal. Otherwise they’re reliable molters. If one goes wrong, our molting guide has the steps.
Why is the Double Shield “double” shielded?
The pronotum (the segment behind the head) has a distinctive constriction in the middle, creating what looks like two separate shield-like sections. It’s the species’ defining visual feature.
What are the blue arm markings for?
Inner-arm coloration is a deimatic display element. When threatened, the mantis raises and spreads its front legs to show the bright blue, often combined with raised wings. Predators (and curious humans) interpret this as a larger, more dangerous animal.
How many males should I keep on hand for breeding?
Plan for at least 3 backup males per breeding female. Cannibalism during pairing is the norm with this species.
Are they good for beginners despite the cannibalism?
For solo-keeping a single nymph through adulthood, yes — they’re forgiving, food-aggressive, and long-lived. The cannibalism warning applies only to breeding situations and to anyone considering communal housing (which is impossible with this species).
Why is the lifespan longer than other mantises?
Larger-bodied species generally live longer. P. medioconstricta is also slow-growing — long nymph development plus a large adult size adds up to a 12–18 month total life. Females especially.