Coptotermes vs Mastotermes — what’s really in your house.
Greater Darwin has two big subterranean termite species and they aren’t equally dangerous. Mastotermes darwiniensis — the Giant Northern Termite — is the most destructive termite in Australia and is found only up here. Coptotermes acinaciformis is the national pest species and is also present. Both warrant urgent treatment. Here’s how to tell them apart and why it matters.
Why species matters.
It’s not just an entomological detail.
When a Darwin homeowner finds termites, the very first question a competent technician asks is “which species?” The answer determines the treatment scope, the warranty paperwork, the inspection frequency going forward, the risk to garden trees, and the cost. The two species both eat the same kind of timber and both build the same general kind of mud workings — but how they live and forage is dramatically different, and that drives everything that follows.
A southern operator who doesn’t do species ID at the active site, or who quotes the same flat treatment package regardless of species, is taking a Coptotermes-style approach to a Mastotermes problem — which means a 30–60% under-scoped treatment that won’t hit the actual colony. We see this in failed retreat jobs at least once a month.
The third species — honourable mention.
Schedorhinotermes intermedius also occurs in the Top End and is a secondary pest. Smaller colonies, less aggressive, but happily colonises damp sub-floors and damaged timbers in older Casuarina, Nightcliff and Coconut Grove stock. Where Schedorhinotermes is found alongside Mastotermes or Coptotermes, treatment scope expands again — but we focus this comparison on the two big species you’re actually likely to find in a Darwin house.
Field ID — soldiers tell the story.
Mastotermes darwiniensis — the Giant Northern Termite.
Mastotermes soldiers are unmistakable once you’ve seen one. Head plus mandibles 11–13 mm long, dark amber to brown head capsule, mandibles disproportionately large and visibly curved, body robust and cigar-shaped. Workers (the ones doing the actual eating) are around 9–11 mm long and much larger than any other Australian termite worker — if you crack open a working in a fence post and the termites inside look like small ants in scale, they’re probably Coptotermes; if they look like fat little maggots with a hard yellowish-brown head, that’s Mastotermes.
Mud workings are chunky, coarse, with visible particle texture — they look like rough hand-applied render rather than fine smooth piping. Galleries inside infested timber are large and often packed with frass. Where Mastotermes has attacked a tree, bark damage is dramatic — bracket lesions exposing chewed sapwood, and on palms the trunk core can be entirely hollowed out while the outer fibres look intact. See our Mastotermes page for full background.
Coptotermes acinaciformis — the national pest.
Coptotermes soldiers are 5–6 mm long with a pale yellowish-cream head capsule and small mandibles. The diagnostic feature: a milky-white defensive secretion exuded from the front of the head capsule when the soldier is provoked — sometimes visible as a small white drop or stain at the front of the head. Workers are 3–4 mm long and translucent-white.
Mud workings are fine, smooth and ridge-like — classic mud tubes following timber edges or external walls, 5–10 mm wide, uniformly textured. Coptotermes does not attack living trees in practice (it will exploit dead and dying timber but won’t take on a healthy sap-flowing tree). Foraging is concentrated within 50–100 m of the central nest, typically a tree stump, in-ground timber, or a wall cavity.
Quick comparison table — everything that matters.
For your own visual reference:
- Soldier size: Mastotermes 11–13 mm vs Coptotermes 5–6 mm.
- Soldier head colour: Mastotermes dark amber-brown vs Coptotermes pale yellowish-cream.
- Worker size: Mastotermes 9–11 mm vs Coptotermes 3–4 mm.
- Colony size: Mastotermes often 1M+ vs Coptotermes 250k–500k.
- Foraging range: Mastotermes hectares vs Coptotermes 50–100 m.
- Diet breadth: Mastotermes timber + living trees + rubber + plastic + soft metals vs Coptotermes timber and dead/dying wood only.
- Mud workings: Mastotermes chunky-textured vs Coptotermes fine-textured.
- Geographic range: Mastotermes tropical north only vs Coptotermes all of mainland Australia.
How treatment differs.
Same products, very different scope.
Both species respond to the same non-repellent termiticides (Termidor SC fipronil, Premise 200SC imidacloprid) and the same baiting systems (Sentricon Always Active, Exterra, Trelona). What changes is the scale and care of the treatment. Detail comparison from our Termidor vs Sentricon guide covers the product-level pros and cons; here we focus on what changes between species.
Coptotermes treatment — typical scope.
Identification of the nest (often within 50–100 m of the visible activity), direct treatment of the active workings, perimeter chemical barrier or bait stations at 3–5 m intervals around the structure, 2–3 month post-treatment verification inspection, 12-month annual inspection cycle thereafter. Typical 2026 cost urban Darwin: $2,800–$5,200 for a standard 3–4 bedroom home.
Mastotermes treatment — expanded scope.
Wider perimeter (the colony forages across hectares, not metres), more bait stations or chemical injection points (typically 2–3 m intervals rather than 3–5 m), careful tracking back to the actual nest which may be a dead tree stump or in-ground feeder colony 30–100+ m from the visible activity, treatment of any garden trees harbouring satellite colonies (see our tree termite guide), 3–6 month post-treatment monitoring with multiple inspections, and a 6-monthly annual inspection cycle thereafter for at least the first two years post-treatment. Typical 2026 cost urban Darwin: $4,200–$8,500 for a standard 3–4 bedroom home; rural Howard Springs / Humpty Doo acreage: $5,500–$12,000 depending on block size and tree count.
Worked example — mixed-species property.
High-set 1980s house on stumps in Casuarina, customer reports activity in the front-garden mango tree and along the southern fence-line. Inspection identifies Mastotermes in the mango (alate remains under the tree from the previous wet) and Coptotermes in the fence-line (mud tube under a redundant garden stake). Treatment plan: Mastotermes-priority scope across the property, with Coptotermes incorporated into the perimeter chemical barrier; Termidor SC injection at the mango plus fence-line treatment, perimeter chemical reticulation around the slab, 3-month follow-up, 6-monthly inspection for next 24 months — $5,800 incl GST. Treating this as a Coptotermes-only job would have under-scoped the Mastotermes colony and missed it entirely.
What this means for your inspection.
Both species, both windows, every property.
A competent Top End termite inspection samples for both species at every property. That means examining mud workings (texture, size, colour), examining any visible termites at active workings, sampling soil at the slab perimeter for foraging tubes, checking garden trees within 15 m for Mastotermes-specific damage, and noting alate remains from any recent swarming events. Failing to sample for both — assuming “it’ll be Coptotermes” because that’s what southern inspectors are trained for — misses Mastotermes about a third of the time on inner-urban Darwin and almost half the time on rural Litchfield acreage.
Our annual AS 3660.2 inspections and pre-purchase inspections include species-ID protocols at every property. The inspection cost guide covers what to ask for in a written report.
After ID — what changes in your inspection cycle.
- Property with Coptotermes only, no current activity: Annual AS 3660.2 inspection, standard perimeter chemical or baiting barrier.
- Property with Coptotermes activity treated: 6-monthly inspection for first year post-treatment, then annual.
- Property with Mastotermes activity treated: 6-monthly inspection for minimum 24 months post-treatment, then 6-monthly continuing review unless conditions clearly low-risk.
- Rural acreage with Mastotermes presence on the block but no current activity in the house: 6-monthly inspection of the house + monitoring stations at perimeter, with garden tree walk every inspection.
Frequently asked questions.
What’s the difference between Coptotermes and Mastotermes in Darwin?
Mastotermes is far larger (soldiers 11–13 mm vs 5–6 mm), bigger colonies (1M+ vs 250k–500k), forages across hectares vs 50–100 m, eats living trees plus rubber, plastic and soft metals (Coptotermes doesn’t), and is found only in tropical northern Australia. Treatment scope differs significantly.
How do I tell which species is in my house?
Soldier size and head colour are the field markers. Mastotermes soldiers 11–13 mm, dark amber-brown head, curved mandibles. Coptotermes 5–6 mm, pale cream head, milky-white defensive secretion. Don’t try to ID over the phone — formal ID by a licensed contractor at the active site is what matters for treatment and warranty.
Is one species more dangerous?
Mastotermes is more dangerous — bigger colonies, faster damage, broader appetite. Coptotermes is also destructive (national pest species) but Mastotermes ranks first in the Top End. Both warrant urgent treatment.
Does treatment differ?
Same active ingredients (Termidor SC, Premise 200SC, Sentricon baiting) but very different scope. Mastotermes treatment is 30–60% larger scope: wider perimeter, more stations, nest tracking, longer monitoring, more frequent annual inspections.
Why doesn’t Mastotermes occur south of Darwin?
Geographic range restricted to tropical northern Australia, broadly north of the Tropic of Capricorn. Cooler southern winter soil temperatures and seasonally dry conditions stop colony establishment. Coptotermes occurs across all of mainland Australia including Darwin.
Species ID and treatment across the Top End.
Get the species ID right — first time.
Mastotermes or Coptotermes — the right treatment depends on it. Licensed NT pest specialists, both species, every inspection.