Care guide
Flat Backed Millipede
Coromus diaphorus (cf.)
A small, armor-plated flat millipede that starts pale white as a juvenile and matures into black with bold yellow paranotal edges: adults reach about 2-3 inches and are easy, prolific breeders once established. 'Flat backed' is a generic trade name covering several genera; this ID matches the bare, unqualified version of the name most closely.
Coromus diaphorus (cf.)
Identity confidence: provisional. This is a genus, group, or trade name rather than a confirmed species. Treat it as the closest match we can stand behind, and use the more conservative end of any range.
Flat Backed Millipede: Advanced Care Guide
Keeper Snapshot: A small, armor-plated flat millipede that starts pale white as a juvenile and matures into black with bold yellow paranotal edges: adults reach about 2-3 inches and are easy, prolific breeders once established. 'Flat backed' is a generic trade name covering several genera; this ID matches the bare, unqualified version of the name most closely.
Group: MillipedesDifficulty: Spice 2: Beginner (cooler-temp quirk)Setup: Cool-tropical communal flat millipedeHandling: Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal.
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Snapshot
| Temperature | 68-75°F: notably cooler than most tropical millipedes; do not use a heat mat |
|---|---|
| Humidity | 70-80% with cross ventilation; cool, damp lower substrate, drier surface |
| Setup Type | Cool-tropical communal flat millipede |
| Substrate | 4 in deep humus-rich soil, shredded deciduous leaves, decaying wood, a little sand/grit, plus cuttlebone |
| Feeding | Decaying wood and leaf mulch, cuttlebone/protein supplement occasionally |
| Care Difficulty | Spice 2: Beginner (cooler-temp quirk) |
| Handling | Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal. |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Enclosure Format / Size Class
- Baby Buddy for a starter group
- Burrow Buddy once the colony grows
Warnings First
- Do not use substrate heating: this species needs cooler-than-typical temps and can be harmed by heat mats
- Standard drying-out risk applies; keep substrate moist to the touch, not waterlogged
- 'Flat backed' is a generic trade name: verify the invoice photo matches the white-juvenile-to-black-with-yellow-edge-adult color progression rather than a different flat-bodied genus
- Cool and damp condenses faster than warm and damp. Cross ventilation low on two opposite walls matters more on a cool-kept species, not less.
Simple Care
- Cooler room-temp keeping: no heat mat.
- Cross ventilation low on two opposite walls; a cool damp bin stalls and condenses faster than a warm one.
- Deep leaf-litter/humus substrate.
- Cuttlebone always available.
- Shallow water dish packed with pebbles so juveniles cannot drown.
- Easy to breed once established: good self-sustaining colony candidate.
Advanced Keeper Notes
Enclosure & Microclimate
- This species does best at room temperature or slightly below typical millipede-tank warmth: resist the instinct to add a heat mat, since underside heating is specifically flagged as harmful for this genus.
- A modest-footprint enclosure with real substrate depth (around 4 inches) and cross-ventilation works well since this smaller-bodied species doesn't need the huge footprint giant African millipedes do.
- Place that cross-ventilation low on two opposite walls, at or just above the substrate. It matters more here than on a warm tropical bin, because cooler air holds less moisture: a cool damp enclosure condenses on the walls and stalls sooner, which is exactly the condition that turns a leaf-litter bin sour and brings on mites.
- Ventilation and ambient humidity trade against each other. Hold moisture in the substrate rather than the air and let the vents flow, rather than closing a cool bin up to keep humidity in.
- Judge by squeeze and smell rather than by gauge. Lower substrate clumps like a wrung-out sponge with no free water and smells like forest floor. Persistent condensation on the walls of a cool enclosure is an early warning.
- Keep a shallow water dish packed with pebbles so the waterline sits below the rim, and mist under the leaf litter rather than over the surface. On a breeding colony there are always small juveniles around, and they drown in water depths the adults walk through.
Feeding, Growth & Maintenance
- Feeding: shredded deciduous leaf litter and decaying wood as the staple diet, with cuttlebone or crushed oyster shell always present for calcium.
- Molting: happens in a sealed underground chamber. Leave any motionless, buried animal alone and keep that patch of substrate from drying out until it re-emerges.
Possible Origin / Range
- Likely native range: West Africa (Nigeria and surrounding rainforest).
- Habitat translation: Humid West African forest floor litter: moist, cooler-than-tropical leaf-litter substrate.
Advanced Keeper Details
- One of the easier trade millipedes to breed to self-sustaining colony size: a good candidate for a starter-colony product listing rather than single-animal sales.
- Because 'flat backed millipede' covers several genera in the broader trade, double-check incoming photos against the juvenile-white-to-adult-black-with-yellow-edges color progression before confirming ID.
- Sources: the full Big Z APA 7 reference list lives at References.
Coromus diaphorus (cf.)
Identity confidence: provisional. This is a genus, group, or trade name rather than a confirmed species. Treat it as the closest match we can stand behind, and use the more conservative end of any range.
Flat Backed Millipede
Big Z's Quick Verdict: A small, armor-plated flat millipede that starts pale white as a juvenile and matures into black with bold yellow paranotal edges: adults reach about 2-3 inches and are easy, prolific breeders once established. 'Flat backed' is a generic trade name covering several genera; this ID matches the bare, unqualified version of the name most closely.
Group: MillipedesDifficulty: Spice 2: Beginner (cooler-temp quirk)Setup: Cool-tropical communal flat millipedeHandling: Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal.
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Care Snapshot
| Temp | 68-75°F: notably cooler than most tropical millipedes; do not use a heat mat |
|---|---|
| Humidity | 70-80% with cross ventilation; cool, damp lower substrate, drier surface |
| Setup | Cool-tropical communal flat millipede |
| Substrate | 4 in deep humus-rich soil, shredded deciduous leaves, decaying wood, a little sand/grit, plus cuttlebone |
| Feeding | Decaying wood and leaf mulch, cuttlebone/protein supplement occasionally |
| Handling | Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal. |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Recommended Big Z's Setup
- Baby Buddy for a starter group: small adult size, prolific breeder, good starter-colony candidate
- Burrow Buddy once the colony grows
Critical Notes
- Do not use substrate heating: this species needs cooler-than-typical temps and can be harmed by heat mats
- Standard drying-out risk applies; keep substrate moist to the touch, not waterlogged
- 'Flat backed' is a generic trade name: verify the invoice photo matches the white-juvenile-to-black-with-yellow-edge-adult color progression rather than a different flat-bodied genus
- Cool and damp condenses faster than warm and damp. Cross ventilation low on two opposite walls matters more on a cool-kept species, not less.
Care Basics
- Cooler room-temp keeping: no heat mat.
- Cross ventilation low on two opposite walls; a cool damp bin stalls and condenses faster than a warm one.
- Deep leaf-litter/humus substrate.
- Cuttlebone always available.
- Shallow water dish packed with pebbles so juveniles cannot drown.
- Easy to breed once established: good self-sustaining colony candidate.
Feeding, Growth & Maintenance
- Feeding: shredded deciduous leaf litter and decaying wood as the staple diet, with cuttlebone or crushed oyster shell always present for calcium.
- Molting: happens in a sealed underground chamber. Leave any motionless, buried animal alone and keep that patch of substrate from drying out until it re-emerges.
Current Big Z's catalog: No
Coromus diaphorus (cf.)
Identity confidence: provisional. This is a genus, group, or trade name rather than a confirmed species. Treat it as the closest match we can stand behind, and use the more conservative end of any range.
Flat Backed Millipede: Advanced Care Guide
Keeper Snapshot: A small, armor-plated flat millipede that starts pale white as a juvenile and matures into black with bold yellow paranotal edges: adults reach about 2-3 inches and are easy, prolific breeders once established. 'Flat backed' is a generic trade name covering several genera; this ID matches the bare, unqualified version of the name most closely.
Group: MillipedesDifficulty: Spice 2: Beginner (cooler-temp quirk)Setup: Cool-tropical communal flat millipedeHandling: Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal.
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Snapshot
| Temperature | 68-75°F: notably cooler than most tropical millipedes; do not use a heat mat |
|---|---|
| Humidity | 70-80% with cross ventilation; cool, damp lower substrate, drier surface |
| Setup Type | Cool-tropical communal flat millipede |
| Substrate | 4 in deep humus-rich soil, shredded deciduous leaves, decaying wood, a little sand/grit, plus cuttlebone |
| Feeding | Decaying wood and leaf mulch, cuttlebone/protein supplement occasionally |
| Care Difficulty | Spice 2: Beginner (cooler-temp quirk) |
| Handling | Brief contact tolerated. Handling is optional and never required for good care, and a fall can injure the animal. |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Enclosure Format / Size Class
- Baby Buddy for a starter group
- Burrow Buddy once the colony grows
Warnings First
- Do not use substrate heating: this species needs cooler-than-typical temps and can be harmed by heat mats
- Standard drying-out risk applies; keep substrate moist to the touch, not waterlogged
- 'Flat backed' is a generic trade name: verify the invoice photo matches the white-juvenile-to-black-with-yellow-edge-adult color progression rather than a different flat-bodied genus
- Cool and damp condenses faster than warm and damp. Cross ventilation low on two opposite walls matters more on a cool-kept species, not less.
Simple Care
- Cooler room-temp keeping: no heat mat.
- Cross ventilation low on two opposite walls; a cool damp bin stalls and condenses faster than a warm one.
- Deep leaf-litter/humus substrate.
- Cuttlebone always available.
- Shallow water dish packed with pebbles so juveniles cannot drown.
- Easy to breed once established: good self-sustaining colony candidate.
Advanced Keeper Notes
Enclosure & Microclimate
- This species does best at room temperature or slightly below typical millipede-tank warmth: resist the instinct to add a heat mat, since underside heating is specifically flagged as harmful for this genus.
- A modest-footprint enclosure with real substrate depth (around 4 inches) and cross-ventilation works well since this smaller-bodied species doesn't need the huge footprint giant African millipedes do.
- Place that cross-ventilation low on two opposite walls, at or just above the substrate. It matters more here than on a warm tropical bin, because cooler air holds less moisture: a cool damp enclosure condenses on the walls and stalls sooner, which is exactly the condition that turns a leaf-litter bin sour and brings on mites.
- Ventilation and ambient humidity trade against each other. Hold moisture in the substrate rather than the air and let the vents flow, rather than closing a cool bin up to keep humidity in.
- Judge by squeeze and smell rather than by gauge. Lower substrate clumps like a wrung-out sponge with no free water and smells like forest floor. Persistent condensation on the walls of a cool enclosure is an early warning.
- Keep a shallow water dish packed with pebbles so the waterline sits below the rim, and mist under the leaf litter rather than over the surface. On a breeding colony there are always small juveniles around, and they drown in water depths the adults walk through.
Feeding, Growth & Maintenance
- Feeding: shredded deciduous leaf litter and decaying wood as the staple diet, with cuttlebone or crushed oyster shell always present for calcium.
- Molting: happens in a sealed underground chamber. Leave any motionless, buried animal alone and keep that patch of substrate from drying out until it re-emerges.
Possible Origin / Range
- Likely native range: West Africa (Nigeria and surrounding rainforest).
- Habitat translation: Humid West African forest floor litter: moist, cooler-than-tropical leaf-litter substrate.
Advanced Keeper Details
- One of the easier trade millipedes to breed to self-sustaining colony size: a good candidate for a starter-colony product listing rather than single-animal sales.
- Because 'flat backed millipede' covers several genera in the broader trade, double-check incoming photos against the juvenile-white-to-adult-black-with-yellow-edges color progression before confirming ID.
- Sources: the full Big Z APA 7 reference list lives at References.