Crematogaster ampullaris

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southeast Asia, Indonesia (Sulawesi, Timor), Philippines (Leyte), Brunei, Borneo, Ceram. Found in rainforest canopies and lowland dipterocarp forest at elevations from sea level to lowland areas ^[2][1].
• Colony Type: Colony structure is not documented in scientific literature. Crematogaster colonies can vary in queen number.
• Size & Growth:
  • Queen: Size data unavailable, no direct measurements exist for queens in the literature.
  • Worker: Workers measure approximately 2.4-2.8mm total length based on Weber's length measurements (1.26-1.48mm WL) plus head and gaster ^[1]. Workers show pronounced size polymorphism.
  • Colony: Colony size is not documented in available literature.
  • Growth: Growth rate is not documented.
  • Development: Development time is not documented for this species. (Development time is temperature-dependent in tropical species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, this is a tropical rainforest species from Southeast Asia. Room temperature (22-25°C) is acceptable. A heating cable on one side of the nest creates a gradient allowing workers to self-regulate.
  • Humidity: Keep humidity high, these are rainforest canopy ants. Maintain substrate moisture at 70-80%, with the nest area consistently damp but not waterlogged. Provide a water tube for drinking access.
  • Diapause: No, this is a tropical species that does not require hibernation. Keep temperatures stable year-round.
  • Nesting: Arboreal nesting preferences, in nature they likely nest in hollow twigs, branches, or under bark in the canopy. In captivity, a Y-tong (AAC) nest or plaster setup with narrow chambers works well. Provide small cavities and passages scaled to their small worker size.
• Behavior: Crematogaster ants are known for their distinctive heart-shaped gaster that they can raise and curl over their body, giving them their 'acrobat' common name. Workers are active foragers and will recruit nestmates to food sources. They are generally not aggressive toward keepers but will defend their nest. They have a functional stinger but it's small, they are not considered dangerous to humans. Standard barriers work well for escape prevention.
• Common Issues: humidity management is critical, too dry and brood will fail, too wet and mold becomes a problem, tropical temperature requirements mean colonies cannot tolerate cool rooms or air conditioning, small colony size initially means founding colonies are fragile and sensitive to disturbance, canopy-dwelling nature means they may not thrive in ground-based nests without proper vertical space, size polymorphism means first workers (nanitics) are very small, escape prevention must account for tiny workers

Nest Preferences and Housing

Crematogaster ampullaris is a canopy-dwelling species that naturally nests in hollow twigs, branches, or under bark in rainforest trees ^[2]. In captivity, replicate these conditions using a Y-tong (AAC) nest or plaster formicarium with small chambers scaled to their worker size. The chambers should be narrow with tight passages, avoid tall, open spaces that stress these small ants.

For the outworld, provide moderate space with some vertical structures (fake plants, cork, or twigs) to mimic their arboreal habitat. A water test tube should always be available for drinking. Because they are canopy ants, they prefer having their nest elevated rather than at ground level, you can place the nest on a small platform or elevated surface.

Escape prevention is important. Workers are small so they can squeeze through small gaps, check for any cracks or gaps in your setup. Standard barrier methods work well.

Feeding and Diet

Crematogaster ampullaris is an omnivorous species that will accept a variety of food sources. In their natural rainforest habitat, they likely feed on honeydew from aphids and scale insects, nectar from flowers, and small insects they can capture or scavenge.

In captivity, offer protein sources such as small live prey (fruit flies, small crickets, mealworms cut into appropriate pieces) several times per week. They also readily accept sugar sources, provide a drop of honey water or sugar water regularly. You can also offer small amounts of fruit.

Remove uneaten prey after 24-48 hours to prevent mold. A varied diet helps ensure colony health and supports the growth of their pronounced size polymorphism, well-fed colonies will produce larger workers more quickly.

Temperature and Seasonal Care

As a tropical species from Southeast Asia, Crematogaster ampullaris requires warm temperatures year-round. Keep the nest area at 24-28°C for optimal brood development ^[2]. Room temperature (22-25°C) is acceptable in most homes, but you may need to provide slight heating if your space runs cool.

A heating cable placed on one side of the nest creates a temperature gradient that allows workers to regulate their own body temperature by moving between warmer and cooler areas. Place the heating element on top of the nest, not underneath, to avoid drying out the substrate too quickly.

Because this is a tropical species, no hibernation or diapause is required. Maintain stable temperatures throughout the year, avoid placing the colony near air conditioning vents, drafty windows, or rooms that cool significantly at night. Sudden temperature drops can stress colonies and slow or stop brood development.

Behavior and Temperament

Crematogaster ants are named for their distinctive 'acrobat' behavior, they can raise and curl their heart-shaped gaster over their body, which they use for defense and communication. Workers are active foragers that will quickly discover and recruit nestmates to food sources.

This species is generally not aggressive toward keepers. Workers may investigate your hand but rarely bite. They have a small stinger, but it's typically too tiny to penetrate human skin, they are not considered dangerous to humans.

The pronounced size polymorphism in this species means colonies produce increasingly larger workers as they grow. These larger workers are better at defense and foraging, while smaller workers handle brood care and internal colony tasks. This division of labor helps the colony function efficiently.

Foraging activity is typically highest during daylight hours, matching their canopy-dwelling nature where light penetrates through the forest canopy. ^[1]

Colony Growth and Development

Crematogaster ampullaris colonies develop through several stages. A newly mated queen will seal herself into a small chamber and lay her first eggs, surviving on her stored fat reserves until the first workers emerge. These first workers, called nanitics, are smaller than mature workers due to the limited resources the queen had available.

Once the nanitics emerge, they begin foraging to feed the queen and subsequent brood. The colony grows gradually at first, but accelerates as more workers are produced. The pronounced size polymorphism means that as the colony matures, you'll see increasingly larger workers developing.

Development time varies with temperature, warmer conditions within their tropical range will speed development while cooler temperatures will slow it down. ^[1]

Frequently Asked Questions

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References