Crematogaster carinata

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical rainforests from Costa Rica to Brazil and Bolivia. Found in arboreal vegetation, canopy forests, and second-growth areas. Nests in dead twigs, branches, and under epiphytes. Often builds carton structures and ant gardens in humid forest areas ^[1][4][2].
• Colony Type: Facultatively polygynous, some populations have large polygynous, polydomous colonies with many queens spread across multiple nest sites, while other populations maintain discrete single-queen colonies. Workers are monomorphic ^[1][5][6].
• Size & Growth:
  • Queen: 5-7mm (estimated based on genus patterns)
  • Worker: ~2-3mm, inferred from Crematogaster genus
  • Colony: Can reach thousands of workers in polygynous populations, one documented nest contained 43 dealate queens with abundant workers and brood ^[1]
  • Growth: Moderate to Fast
  • Development: 6-8 weeks (estimated based on typical tropical Crematogaster development) (Development times are not directly studied for this species. Estimates based on genus-level data. Warmer temperatures within safe range may accelerate development.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a tropical species, they need consistent warmth. A heating cable on one side of the nest can create a gentle gradient if needed ^[1].
  • Humidity: High humidity (60-80%). These are forest canopy ants that need damp conditions. Keep nest substrate consistently moist but not waterlogged. Their natural habitat is very humid tropical rainforest ^[1][7].
  • Diapause: No, as a tropical species, they do not hibernate. Colony activity continues year-round at appropriate temperatures ^[1].
  • Nesting: Arboreal twig-nesters. Provide small diameter twigs or branches (5-15mm diameter) as nesting material. Y-tong (AAC) nests or plaster nests with small chambers work well. They will also build carton material, so providing some loose nesting material they can manipulate is beneficial ^[1][8].
• Behavior: Generally calm and not particularly aggressive toward keepers. Workers are generalized omnivores, they'll take sugar water, honey, and protein sources like small insects. They forage day and night. When disturbed, they raise their gaster as a defensive display and can release chemical secretions. They are skilled climbers and may escape through small gaps. Their small size means escape prevention is critical ^[1][9].
• Common Issues: escape prevention is critical due to their very small size, use fine mesh barriers and tight-fitting lids, tropical humidity requirements can lead to mold if ventilation is poor, balance humidity with adequate airflow, polygynous colony structure means multiple queens may be present, this is normal but can complicate colony management, slow founding stage, new colonies may take months to establish as the queen raises first workers alone, wild-caught colonies may carry parasites or pathogens that can cause colony failure in captivity

Housing and Nest Setup

Crematogaster carinata is an arboreal twig-nester, so your setup should reflect their natural nesting preferences. Small diameter twigs or wooden pieces with pre-drilled holes (5-15mm diameter) make ideal natural nests. Alternatively, Y-tong (AAC) nests with narrow chambers or plaster nests work well in captivity. They prefer tight chambers scaled to their tiny size ^[1][8].

The outworld should be well-planted or contain artificial foliage since they are arboreal and feel safer with cover. These ants are excellent climbers, so escape prevention must be excellent, use fluon on container rims and fine mesh on any ventilation. A water test tube connected to the nest area provides drinking water and helps maintain humidity. Keep the nest area humid (60-80%) while allowing the outworld to be somewhat drier with good ventilation to prevent mold ^[1].

Feeding and Diet

These ants are generalized omnivores, similar to most Crematogaster species. They readily accept sugar sources, a cotton ball with sugar water or honey should be available at all times. For protein, offer small insects like fruit flies, small crickets, mealworms, or other appropriately-sized prey. They are active foragers and will recruit nestmates to good food sources ^[1].

In the wild, they scavenge dead and wounded insects, visit extrafloral nectaries on plants, and tend aphids for honeydew. You can replicate this by offering occasional sweet fruits alongside their sugar water. Feed protein 2-3 times per week, adjusting based on colony size and brood production. Remove uneaten prey after 24-48 hours to prevent mold. A varied diet helps maintain colony health ^[1][10].

Temperature and Seasonal Care

As a Neotropical species from Costa Rica to Brazil, Crematogaster carinata requires warm temperatures year-round. Keep the nest area at 24-28°C. Temperatures below 20°C can slow activity and may stress the colony. A small heating cable or heat mat on one side of the nest creates a temperature gradient they can choose from ^[1].

Unlike temperate ants, they do not require hibernation or winter dormancy. Colony activity continues throughout the year at appropriate temperatures. However, avoid overheating, temperatures above 32°C can be harmful. If your room temperature is naturally in the low-to-mid 20s°C, no additional heating may be needed. Monitor colony behavior, if workers cluster near the heat source, increase slightly, if they avoid it, reduce heat ^[1].

Colony Structure and Social Organization

One of the most fascinating aspects of C. carinata is its social flexibility. In some areas (like the Atlantic lowlands of Costa Rica), they form massive polygynous colonies with many physogastric (reproductive) queens spread across multiple nest sites. These colonies can be polydomous, workers and brood distributed among many connected nests covering large areas of forest, with no obvious colony center ^[1].

In contrast, populations in Pacific Costa Rica and some sites in Venezuela maintain single-queen colonies. This variation means your colony may have one queen or several, both are normal for this species. The workers are monomorphic (all the same size), and colonies can grow very large. If you have a polygynous colony, do not attempt to remove queens as this can destabilize the colony ^[1][5][6].

Unique Behaviors and Defenses

When threatened, Crematogaster carinata raises its distinctive heart-shaped gaster upward in a defensive display, this is where their common name 'acrobat ant' comes from. They can release chemical secretions from the gaster tip as a defense mechanism. This is their primary defense since they lack a stinger effective against humans ^[1].

In the wild, they often form parabiotic associations with other ant species, particularly Dolichoderus debilis. This means they share nest space and foraging trails while keeping their brood separate. They also build remarkable carton structures, small shelters over scale insects to larger globular masses that can form ant gardens with epiphytes. In captivity, providing some loose material they can manipulate for carton construction may encourage natural behavior ^[1][3].

Growth and Development

Colony growth follows typical Myrmicinae patterns but specific development times for C. carinata are not documented. Based on related tropical Crematogaster species, expect 6-8 weeks from egg to first worker (nanitic) at optimal temperature (around 26°C). Nanitics are typically smaller than normal workers but will be functional ^[1].

Mature colonies can grow very large in polygynous populations, thousands of workers spread across multiple nest sites. Growth rate is moderate to fast for a tropical species. Brood development continues year-round without diapause. Providing consistent warmth (24-28°C), high humidity, and good nutrition will maximize growth rate. Colonies may slow during major transitions or if stressed ^[1].

Frequently Asked Questions

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References