Crematogaster degeeri

Crematogaster degeeri

Crematogaster degeeri is a small to medium-sized ant native to Madagascar, where it inhabits montane rainforest, savannah, woodland, and grassland at elevations between 800 and 2650 meters. Workers measure 0.81-1.05mm and display a distinctive appearance with large eyes, fairly long propodeal spines, and a promesonotum that bears angular posterolateral denticles. Their coloration ranges from reddish brown to dark brown or black. These ants are part of the Crematogaster genus, known for their ability to raise their gaster in a defensive display when threatened. In the wild, they nest primarily under stones or in soil, though some arboreal colonies have been found in dead twigs. This species frequently co-occurs with Crematogaster mafybe and Crematogaster sewellii across central and south-central Madagascar.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Central and south-central Madagascar, found in montane rainforest, savannah, woodland, and grassland at 800-2650m elevation ^[1][2]
• Colony Type: Colony structure is unconfirmed for this species. Based on typical Crematogaster patterns, likely single-queen (monogyne) colonies in most populations.
• Size & Growth:
  • Queen: 1.44-1.56mm ^[3]
  • Worker: 0.81-1.05mm ^[1]
  • Colony: Unknown, likely moderate-sized colonies based on genus patterns
  • Growth: Moderate, estimated based on similar tropical Myrmicinae
  • Development: Estimated 6-10 weeks at tropical temperatures based on genus patterns (Direct development data unavailable for this species, estimates based on related Crematogaster species)
• Antkeeping:
  • Temperature: Keep at 22-26°C. The high-elevation Madagascar habitat (800-2650m) suggests they can tolerate cooler conditions than typical lowland tropical ants. A gentle gradient allowing warmer and cooler zones is ideal.
  • Humidity: Moderate to high humidity (60-80%). The montane rainforest and grassland habitats indicate they prefer damp conditions but not waterlogged substrate. Provide a moisture gradient so ants can self-regulate.
  • Diapause: Likely a mild seasonal slowdown during Madagascar's dry season (May-October). Reduce feeding and lower temperatures slightly (by 3-5°C) during this period rather than a true hibernation.
  • Nesting: Will accept most standard nest types. In captivity, they do well in test tubes, Y-tong nests, or plaster nests. Provide connections to an outworld for foraging. Given their ground-nesting nature in the wild, a nest with some soil or substrate depth works well.
• Behavior: These ants are active foragers with a generally non-aggressive temperament. Like other Crematogaster, they may raise their gaster in a defensive display when disturbed, though their small size makes them relatively harmless to humans. Workers are quick-moving and good climbers, so escape prevention should be taken seriously despite their small size. They are omnivorous and will readily accept sugar sources and protein foods.
• Common Issues: small size means escapes are likely without fine mesh barriers, high-elevation origin makes them sensitive to overheating, avoid temperatures above 28°C, wild-caught colonies may harbor parasites that can devastate captive populations, slow founding phase means colonies are vulnerable to stress in the first few months, limited availability means this species is rarely kept in captivity, care information is largely inferential

Housing and Nest Setup

Crematogaster degeeri will adapt to various captive setups. Test tubes work well for founding colonies, use a standard test tube setup with a water reservoir connected via cotton. For established colonies, Y-tong (acrylic) nests or plaster nests provide good visibility and humidity control. Given their natural ground-nesting behavior, adding a thin layer of soil or substrate to part of the nest can encourage natural digging behavior, though it's not required. Connect the nest to a foraging area (outworld) that allows for easy food introduction and waste removal. Because they are small and agile, ensure all connections are secure and the outworld has proper barriers. ^[1]

Feeding and Diet

Like other Crematogaster species, this ant is omnivorous and will accept a varied diet. Offer sugar water, honey, or diluted maple syrup as a constant carbohydrate source. For protein, provide small insects such as fruit flies, small mealworms, or cricket pieces. They are not aggressive hunters, so prey should be small or pre-killed initially. Some colonies may accept small amounts of seeds or plant matter, but protein and sugar should form the core of their diet. Feed small amounts every 2-3 days and remove uneaten food to prevent mold.

Temperature and Seasonal Care

Maintain temperatures between 22-26°C, with a slight gradient allowing ants to choose their preferred zone. The high-elevation Madagascar origin (800-2650m) means this species is more tolerant of cooler conditions than typical lowland tropical ants, avoid overheating above 28°C. During Madagascar's dry season (approximately May to October), consider a mild seasonal adjustment by reducing temperatures by 3-5°C and decreasing feeding frequency. This is not a true hibernation but a seasonal slowdown. Monitor colony activity levels to guide adjustments. ^[1]

Behavior and Defense

Crematogaster degeeri exhibits typical Crematogaster behavior, workers are active, agile, and quick-moving. When threatened, they may raise their gaster in a defensive posture, though their small size means they pose minimal threat to humans. They are good climbers and may explore vertical surfaces in search of food. Workers communicate through chemical trails and may form foraging columns to food sources. This species is not known for unusual aggression toward keepers but should be handled gently to avoid stressing the colony. ^[1]

Colony Establishment

A newly mated queen will found a colony claustrally, she seals herself in a chamber and relies on stored fat reserves to survive until her first workers emerge. The founding phase typically takes 4-8 weeks, though this is estimated based on genus patterns. During this time, the queen requires complete darkness and minimal disturbance. Once workers emerge (nanitics, which are smaller than normal workers), the colony can begin accepting food. Growth is moderate, expect several months to reach 20-30 workers, and a year or more to reach 100+ workers. Patience is essential during the founding phase.

Frequently Asked Questions

References