Crematogaster dohrni

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to India, Sri Lanka, Myanmar, Thailand, and southern China. Found across multiple Indian states (Haryana, Karnataka, Kerala, Manipur, Tamil Nadu, Tripura), Sri Lanka (wet and dry zones), and southern China. Inhabits primary forest, coconut plantations, agricultural land, and cool broadleaved forest areas up to 2100m elevation ^[6][5][7][3].
• Colony Type: Colony structure unconfirmed, specific data on queen number is unavailable for this species. Workers are polymorphic with some individuals developing ocelli ^[1][2].
• Size & Growth:
  • Queen: size data unavailable
  • Worker: 3.5-4.5mm ^[1]
  • Colony: size data unavailable
  • Growth: Moderate
  • Development: development time unconfirmed for this species (Crematogaster species typically develop faster in warmer conditions.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This tropical species requires warm conditions similar to its native range in India and Sri Lanka. A gentle heat gradient allows workers to regulate their temperature.
  • Humidity: Moderate to high humidity (60-80%). Their native range includes both wet zone and dry zone environments, but arboreal ants prefer some moisture. Provide a water tube and occasional misting of the outworld.
  • Diapause: No, this is a tropical species from warm climates. No hibernation required, though you may reduce feeding slightly during cooler winter months if room temperature drops.
  • Nesting: Arboreal setup works best. Use a Y-tong (AAC) nest, plaster nest, or naturalistic setup with cork bark or vertically oriented materials. They prefer enclosed dark spaces for nesting. Can also be kept in test tubes with cotton ball nests if given proper outworld space. Avoid fully horizontal setups as they prefer vertical nesting.
• Behavior: Active foragers with a curious temperament. Workers are fast-moving and will readily explore their outworld for food. When disturbed, they raise their abdomen in a defensive display, this is where the 'acrobat ant' name comes from. They have a functional stinger but rarely use it on humans due to their small size. Moderate escape risk due to small worker size, ensure your barrier (Fluon) is applied properly. They are primarily scavengers and will accept a variety of foods ^[2].
• Common Issues: escape prevention is critical due to their small 3.5mm size, use fine mesh and reliable barriers, colonies may struggle in overly dry conditions, monitor humidity, slow founding phase, new colonies need patience during establishment, wild-caught colonies may carry parasites, quarantine and observe new colonies, overfeeding can lead to mold problems in their nesting area

Housing and Nest Setup

Crematogaster dohrni is an arboreal species, so your setup should reflect their natural nesting preferences. They do well in Y-tong (AAC) nests, plaster nests, or naturalistic setups with cork bark and vertically oriented materials. The key is providing dark, enclosed nesting spaces that mimic tree hollows and under-bark locations where they naturally nest. A test tube setup can work for founding colonies, but transfer to a more spacious formicarium once the colony reaches 20-30 workers. The outworld should have some vertical climbing space since they naturally forage upward. Ensure excellent escape prevention, these tiny ants can squeeze through surprisingly small gaps. Apply Fluon or similar barrier to all edges.

Feeding and Diet

In the wild, workers have been observed scavenging on dead grasshoppers and lizards, confirming their generalist scavenger diet ^[2]. In captivity, offer a varied diet: protein sources like small mealworms, fruit flies, small crickets, or other tiny insects twice weekly. They also accept sugar water, honey, or diluted maple syrup as carbohydrate sources. Fresh fruit pieces can be offered occasionally. Remove uneaten protein within 24-48 hours to prevent mold. A constant sugar water supply is recommended once workers are active. Their small size means prey items should be appropriately sized, nothing larger than their head.

Temperature and Seasonal Care

As a tropical species from India, Sri Lanka, and southern China, Crematogaster dohrni requires warm temperatures. Keep the nest area at 24-28°C for optimal brood development. A slight temperature gradient allows workers to self-regulate. Room temperature in most homes is acceptable if it falls within this range. If your space is cooler, use a heating cable on one side of the nest, place it on top of the nest material to avoid drying it out. This species does not require hibernation or diapause. During winter, simply maintain normal temperatures and reduce feeding slightly if activity decreases. Avoid temperatures below 20°C for extended periods.

Behavior and Temperament

These ants are active foragers with an inquisitive nature. Workers move quickly and will thoroughly explore their enclosure. Their most distinctive behavior is the defensive display where they raise their heart-shaped abdomen, hence the name 'acrobat ant.' They have a functional stinger but rarely use it on humans, the small size makes it difficult for them to penetrate skin. They are not particularly aggressive toward humans but will defend their nest if threatened. Colony temperament varies, some colonies are more skittish while others are bolder. They communicate through chemical trails and will quickly recruit workers to food sources. Their small size means they can be overlooked as 'just tiny ants' but they are active and engaging to watch.

Colony Development

A founding queen will seal herself in a claustral chamber and raise her first brood using stored fat reserves, this is typical for many Crematogaster species, though specific founding behavior is unconfirmed for C. dohrni. The first workers (nanitics) will be smaller than normal workers but the colony will quickly produce larger workers as it grows. Colonies grow at a moderate pace. Once established, colonies can grow to moderate sizes. The colony becomes more active and visible as worker numbers increase. Polymorphism is present in this species, with some workers developing ocelli (simple eyes on the head), this is a normal trait and not a cause for concern ^[1][2].

Frequently Asked Questions

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References