African Olive Millipede (Analocostreptus gregorius)

The African Olive Millipede is one of the more visually distinctive medium-large hobby millipedes available in the UK — a slender 120 mm Angolan species with a properly unusual olive-to-mahogany colouration that's genuinely rare among millipedes. Combined with semi-arboreal climbing behaviour (rather than pure burrowing), moderate day-time activity, and properly forgiving husbandry, this is one of the right entry points into African giant millipedes. Adults aren't as massive as the famous African Giant Black species, but the smaller size and easier care make this a more accessible option for keepers stepping up from beginner species.

This is part of our wider millipede collection and shares family-level evolutionary heritage with our Burmese Beauty Millipede — both belong to order Spirostreptida, family Spirostreptidae. The genus Analocostreptus itself was only formally separated from Spirostreptus in 2023, when Enghoff's taxonomic revision reassigned 32 nominal species from the latter to the former. For collectors building a focused Spirostreptidae display, these two species together demonstrate the family's geographic range (Angolan vs Tanzanian) and aesthetic range (olive-coloured slender vs banded chunky) within a single taxonomic family.

Two honest framing points up front. First, the common name "African Olive Millipede" is genuinely confusing — it's more commonly applied to a completely different species, Telodeinopus aoutii, in much of the hobby trade. Buyers researching care online may encounter information about the wrong species. Second, you'll find this species sold under both Analocostreptus gregorius (current accepted name) and Spirostreptus gregorius (older name, still widely used in trade). Both refer to the same animal — the taxonomic update is recent (2023) and hobby usage is still catching up. To set things up properly from the start, browse our accessories collection for substrate components, leaf litter, and other items this species depends on.

Quick Care Summary

• Scientific Name: Analocostreptus gregorius (Attems, 1914) — originally described as Spirostreptus gregorius; moved to genus Analocostreptus by Enghoff in 2023. Both names still appear in the trade
• Common Names: African Olive Millipede (also applied to Telodeinopus aoutii), Olive Millipede, sometimes "Spirostreptus sp. 2" in older hobby trade
• Family: Spirostreptidae (order Spirostreptida); tribe Perustreptini. Genus Analocostreptus established by Silvestri in 1910
• Genus context: The 2023 Enghoff revision moved 32 nominal species from Spirostreptus to Analocostreptus. The revision solved the problem of "orphaned" species that had been placed in Spirostreptus sensu auctorum (i.e., as historically used) but didn't actually belong with the type species of Spirostreptus
• Origin: Angola (type locality) and the Democratic Republic of the Congo. Documented from forest and woodland habitats in central/southern African tropical regions
• Adult Size: Up to ~120 mm (12 cm); slender body shape gives a longer-looking animal than the length alone suggests
• Lifespan: Several years in good captive conditions — typical Spirostreptidae longevity
• Difficulty: Easy — properly forgiving compared to specialist species like our Amber Millipede or our Red Ring Millipede
• Temperature: 22–27 °C; supplementary heat needed through cooler UK months
• Humidity: 70–80% — properly tropical; substrate kept consistently moist
• Ventilation: Moderate — enough to prevent stagnation
• Climbing: Semi-arboreal — properly active climbers; will use branches, cork bark, vertical structure
• Activity: Moderately active during the day — properly visible compared to pure nocturnal millipedes
• Appearance: Slender cylindrical body with smooth segmented exoskeleton; distinctive olive to deep mahogany colouration sometimes with subtle banding — properly unusual palette for hobby millipedes
• Sexual dimorphism: Both pairs of legs on the seventh body segment are modified into gonopods in males (characteristic of order Spirostreptida); females lack these modifications
• Social structure: Peaceful in groups; coexist without problems given adequate space and food
• Defensive secretion: Standard millipede benzoquinones (not cyanide) — temporary skin stain but harmless to humans
• Rarity: Uncommon in UK hobby; periodically available rather than constantly stocked

What Makes the African Olive Millipede Special

The colour is genuinely unusual. Most hobby millipedes show some variation on brown, black, red, orange, or banded patterns of these colours. The African Olive's olive-green to deep mahogany palette is properly distinctive — closer to military olive drab than the warm browns of typical Spirostreptidae. Under good lighting, the smooth glossy segments catch light in a way that emphasises the unusual colouration. For keepers wanting visually different millipedes from the standard palette, this is one of the right species.

The semi-arboreal lifestyle. Multiple hobby sources document this species as a climber — they use vertical structure (branches, cork bark) rather than spending all their time in substrate. This is properly different from species like our Amber Millipede (strictly fossorial) and similar to our Thai Rainbow or Red Ring Millipede. For display-focused keepers, the climbing behaviour means actually visible animals rather than hidden burrowers.

The day-active behaviour. Unlike most hobby millipedes (which are predominantly nocturnal), African Olive Millipedes are documented as moderately active during daylight hours. This properly increases display value — you can observe the animals during normal hours rather than requiring late-night enclosure checks.

The Spirostreptidae family connection. Within our millipede collection, this species shares family heritage with our Burmese Beauty Millipede — both Spirostreptidae, both in order Spirostreptida. The visual contrast between the two (slender olive Angolan vs chunky banded Tanzanian) shows the family's range while maintaining the husbandry similarity that makes them work as a paired collection. For keepers wanting two complementary Spirostreptidae species, this is the right combination.

The 2023 taxonomic story. The genus Analocostreptus wasn't widely used in the hobby until the 2023 Enghoff revision moved this species (and 31 others) from Spirostreptus. The previous placement in Spirostreptus was properly incorrect — the species didn't belong with the type species of Spirostreptus, and the new genus designation reflects more accurate taxonomy. For collectors interested in actively-evolving taxonomy rather than static historical names, this is recent (2023) and worth knowing.

The beginner-friendly husbandry. Compared to specialist species like Pelmatojulus (rotten-wood specialists) or sensitive species like Centrobolus, Analocostreptus gregorius is properly forgiving. Multiple hobby sources note it as suitable for beginners — accepts varied foods, tolerates moderate husbandry variation, breeds reliably in captivity. For keepers stepping up from the easiest species to slightly more demanding ones, this is a sensible mid-tier choice.

The slender body proportions. At 120 mm length with a properly slender profile, this species has different visual character from the chunky Pelmatojulus or the very slender Centrobolus. The longer-looking proportions emphasise the legged segmentation and the smooth glossy texture. Combined with the unusual olive colouration, the body proportions produce an elegant overall appearance.

About the Name and the Common Name Confusion

This species has properly more nomenclatural confusion than most.

• Analocostreptus gregorius: The current accepted scientific name following the 2023 Enghoff revision. Described originally by Carl Attems-Petzenstein in 1914 as Spirostreptus gregorius, based on a specimen collected in Angola. Moved to Analocostreptus when Enghoff (2023) reassigned 32 nominal species from Spirostreptus sensu auctorum to the older but unused name Analocostreptus Silvestri, 1910
• Spirostreptus gregorius: The original genus combination, still widely used in trade and hobby contexts. The taxonomic update is recent (2023) and hobby supply chains are still catching up. Both names refer to the same animal
• "Spirostreptus sp. 2": An old hobby trade designation sometimes still seen. Refers to the same species
• Common name "African Olive Millipede" — the confusion: This common name is properly applied to multiple species in the trade. While Wikipedia and some sources use it for Analocostreptus gregorius, the name is more commonly applied to a different species — Telodeinopus aoutii — in much of the hobby trade. The two species are genuinely different animals; care advice for one may not apply to the other. If you're researching "African Olive Millipede" care online, verify which species the source actually means by checking the scientific name. Our stock is the Analocostreptus gregorius species specifically
• Genus etymology: "Analocostreptus" derives from Greek roots; "Streptus" refers to the spiralled (twisted) defensive coiling typical of the order. The species epithet "gregorius" likely honours someone named Gregory, though Attems didn't specify the etymology in the original 1914 description
• Tribe Perustreptini: Within family Spirostreptidae, this species belongs to the tribe Perustreptini. The family-tribe-genus structure shows close evolutionary kinship with other African giant millipedes
• Order Spirostreptida feature: Both pairs of legs on the seventh body segment of males are modified into gonopods (reproductive structures). Standard for the order; shared with our Burmese Beauty Millipede

Setting Up the Enclosure

A 30 × 30 cm floor area works as a baseline for a small group of African Olive Millipedes; scale up proportionally for larger colonies. Both plastic and glass enclosures work; the moderate humidity requirements (70–80%) are achievable in standard terrarium setups without special engineering. The semi-arboreal behaviour means height matters more than for purely fossorial species — a properly tall enclosure with vertical structure rewards the species's natural behaviour.

Substrate depth should be 8–10 cm minimum. The species burrows to moult and during periods of inactivity, and inadequate substrate depth causes failed moults. Deeper is better than shallower; if your enclosure allows 15 cm, even better.

Provide proper climbing structure — this is the species's most distinctive husbandry feature:

• Thick branches positioned vertically and at angles
• Cork bark slabs in vertical orientation
• Multiple climbing surfaces at different heights
• Some horizontal cork or wood pieces as resting platforms

Browse our accessories range for cork bark, branches, and natural climbing options. The animals will properly use these — climbing isn't optional behaviour for this species.

Escape-proofing is straightforward. Like our other Spirostreptida species, A. gregorius isn't a competent climber on smooth surfaces (despite the semi-arboreal behaviour on textured substrates like cork bark). A properly fitting lid with normal ventilation provisions is sufficient.

Important husbandry note: If using supplementary heat, mount the heat source from the side rather than below the enclosure. Under-substrate heating traps animals between heat and dry surface conditions and dries out the substrate they need for moulting.

Substrate

Substrate is properly important as both habitat and food source for any millipede. The right mix:

• Coconut fibre (coir) as the moisture-retaining foundation
• Organic compost (pesticide-free) mixed throughout for nutritional content
• Crumbled rotten hardwood mixed in — properly important food source. Beech, oak, magnolia all work
• Generous layer of hardwood leaf litter on top — essential as food and cover. Browse our accessories collection for ready-prepared leaf litter
• Springtails inoculated to consume excess moisture and prevent mould
• Calcium sources — cuttlebone, crushed eggshell, limestone. Properly important for moulting success. Our calcium options cover the full range

Substrate depth: 8–10 cm minimum. Keep substrate consistently moist throughout but never waterlogged. Maintain a moisture gradient — properly damp at depth, slightly drier at the surface.

Humidity and Temperature

Maintain humidity at 70–80% through substrate moisture and regular misting. The substrate should hold moisture between mistings; light surface misting maintains the higher humidity level. Don't oversaturate the substrate — waterlogged conditions cause mould and can drown animals.

Temperature should be 22–27 °C with 24–26 °C the sweet spot. UK average room temperature is below the species's preferred range for much of the year — supplementary heating is typically needed through autumn-through-spring.

A low-wattage heat mat on a thermostat, mounted on the side of the enclosure rather than underneath, provides ideal supplementary warmth. Side-mounted heating creates a thermal gradient and avoids overheating substrate where burrowing animals spend time during moults. For any fossorial-tendency species, never use under-substrate heating.

Through UK summers, the species typically maintains comfortable temperatures without supplementary heat — but monitor during heatwaves. Brief excursions above 28 °C are tolerated; sustained exposure above 30 °C causes stress.

Diet

African Olive Millipedes are properly omnivorous detritivores — not as dietarily flexible as our Thai Rainbow Millipede but considerably less specialist than our Amber Millipede:

• Hardwood leaf litter — the dietary foundation; should always be available. Browse our accessories collection for ready-prepared leaf litter
• Rotten hardwood — both food and substrate component; constantly consumed
• Fresh vegetables — cucumber, courgette, sweet potato, carrot. Properly accepted
• Fresh fruit — banana, apple, peach, melon. Replace within 24–48 hours
• Calcium sources — cuttlebone, crushed eggshell, limestone. Always available. Our calcium options cover the full range
• Protein supplements occasionally — fish flakes, dog/cat kibble in small amounts

Remove uneaten fresh food within 24–48 hours to prevent mould in the warm humid setup. Hardwood leaf litter remains the dietary foundation; fresh produce supplements rather than replaces it.

Breeding

African Olive Millipedes breed reliably in captivity given proper conditions. The slender body and 120 mm size make sex determination straightforward in adults — males have the modified gonopods on the seventh body segment characteristic of order Spirostreptida; females lack these modifications.

The breeding sequence is properly standard for Spirostreptidae:

• Mating involves prolonged contact between male and female
• Females deposit eggs in moist substrate, typically several centimetres deep
• Juveniles emerge as miniature adults but develop full segmentation through successive moults
• Sexual maturity reached at approximately 1–2 years depending on conditions

For breeding success:

• Group of at least 3–5 animals with both sexes
• Stable temperature in the 24–26 °C range
• Consistent high humidity (70–80%)
• Adequate substrate depth (8–10 cm minimum)
• Continuous supply of leaf litter and rotten wood
• Calcium consistently available
• Patience for the 1–2 year maturation timeline

The species is properly social in captivity — multiple individuals coexist peacefully given adequate space and food. Communal housing improves breeding outcomes by ensuring both sexes are represented.

Handling

African Olive Millipedes are docile and easy to handle. They're calm and slow-moving, and the slender body makes them properly comfortable to hold compared to chunkier species. Like all millipedes, they can secrete a mild defensive liquid (benzoquinones, NOT cyanide like our Polydesmus sp. Tiny Millipede) when stressed — this can temporarily stain skin and may cause mild irritation in sensitive individuals. Wash hands thoroughly after handling.

Don't handle excessively. The defensive secretion costs the animal energy to produce; repeated stress also affects feeding and breeding behaviour. Handle when you genuinely want to observe up close rather than as constant interaction.

Keep handling sessions short and over soft surfaces — a 120 mm millipede falling from height can suffer fatal damage to its exoskeleton.

Who Should Buy African Olive Millipedes?

Ideal for:

• Keepers wanting visually distinctive millipedes with unusual colouration
• Beginners stepping up from the easiest species — properly forgiving husbandry
• Display enthusiasts drawn to climbing rather than burrowing millipedes
• Collectors building a focused Spirostreptidae display alongside our Burmese Beauty Millipede
• Anyone interested in African giant millipedes specifically
• Bioactive vivarium setups with vertical structure
• Keepers wanting day-visible animals rather than purely nocturnal species
• Patient keepers comfortable with 1–2 year maturation

Not ideal for:

• Setups without vertical structure — the semi-arboreal behaviour deserves accommodation
• Cool-room setups unable to maintain 22–27 °C consistently
• Anyone wanting truly massive size — these aren't African Giant Black scale animals
• Keepers expecting bright vibrant colouration — the olive palette is properly understated despite being unusual

Realistic Expectations

The common name "African Olive Millipede" is properly confusing. The same name is widely applied to Telodeinopus aoutii — a different species sometimes also sold as the "African Train Millipede" or "Tanzanian Olive Millipede." If you've researched "African Olive Millipede" care online, verify the scientific name in your source. Care information for A. gregorius and T. aoutii isn't necessarily interchangeable — they're different species in different families.

The genus name change is recent. The 2023 Enghoff revision moving 32 species from Spirostreptus to Analocostreptus is genuinely new taxonomy — many hobby retailers, breeders, and reference sources still use the older Spirostreptus gregorius name. Both names refer to the same animal; the taxonomic update reflects more accurate phylogenetic understanding rather than a different organism.

The olive colouration is real but properly understated. The colour palette of A. gregorius is genuinely unusual for millipedes — olive-green to deep mahogany, sometimes with subtle banding. But "unusual" doesn't mean "vibrant." If you're expecting bright greens or saturated colours, manage expectations — the species delivers visual distinctiveness through palette rather than intensity.

The semi-arboreal behaviour requires vertical structure. New keepers who set up A. gregorius in flat substrate-only enclosures (the way some other hobby millipedes are kept) won't see the species's natural climbing behaviour. Provide vertical cork bark and branches from day one to reward the natural activity pattern.

Slender bodies can look fragile. The 120 mm slender body looks properly delicate compared to chunkier millipedes like our Amber Millipede. Don't let this fool you — Spirostreptidae are properly robust animals. The slender profile is morphologically normal for the family rather than indicating weakness.

Day-time activity is moderate, not constant. The species is "moderately active during the day" — meaning you'll see them on the substrate or cork bark during daylight more often than purely nocturnal species, but not constantly throughout the day. Activity peaks at dawn and dusk; mid-day is typically rest periods.

UK escape isn't an environmental risk. As with the other tropical millipedes in our catalogue, UK outdoor conditions are too cool and dry for A. gregorius to establish in the wild. Recapture escapees promptly but don't worry about establishing feral populations.

Defensive chemistry is benzoquinones (not cyanide). Unlike our Polydesmus sp. Tiny Millipede (which produces cyanide as a Polydesmida species), A. gregorius produces the standard Spirostreptida benzoquinones. These are mostly harmless to handlers — temporary skin staining, mild smell, no toxicity concerns. The compatibility with vertebrate co-inhabitants is properly different too: benzoquinones aren't dangerous in small amounts the way cyanide can be.