Crematogaster marthae

Crematogaster marthae

Crematogaster marthae is a tiny ant species endemic to central Madagascar, belonging to the Crematogaster ranavalonae group. Workers measure just 0.87-0.98mm in head width, making them one of the smaller Crematogaster species. They have the characteristic heart-shaped abdomen that acrobat ants are known for, and feature small but stout propodeal spines. Queens are slightly larger at 1.24-1.32mm head width and have distinctive four-toothed mandibles that set them apart from other species in the subgenus Oxygyne. This species is known only from two locations in central Madagascar: Amparafaravantsiv near Moramanga and Andasibe National Park ^[1].

This is a poorly studied species with limited available information, but being a Crematogaster from the humid forests of central Madagascar, it likely shares care requirements typical of other small tropical acrobat ants. The Andasibe area receives high rainfall year-round, suggesting this species prefers consistently moist conditions.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Central Madagascar, specifically humid forest areas near Moramanga and Andasibe National Park ^[1]. This region experiences a tropical highland climate with year-round rainfall.
• Colony Type: Likely monogyne (single queen colonies) based on typical Crematogaster patterns, though this is unconfirmed for this specific species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: 1.24-1.32mm head width ^[1]
  • Worker: 0.87-0.98mm head width ^[1]
  • Colony: Unknown, no colony size data available. Based on similar small Crematogaster species, likely several hundred workers at maturity.
  • Growth: Unknown, no development data available. Estimated as moderate based on genus patterns.
  • Development: Estimated 5-8 weeks at tropical temperatures (25-28°C) based on typical Crematogaster development (This is an estimate, no direct development data exists for this species. Small tropical ants typically develop faster than temperate species.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, typical for tropical Madagascar species. A slight gradient allowing cooler areas around 22°C is beneficial. Avoid temperatures below 20°C or above 32°C.
  • Humidity: High humidity required, aim for 70-85%. This species comes from the humid forests of central Madagascar. Keep the nest substrate consistently moist but not waterlogged. Provide a water source.
  • Diapause: No, being a tropical species from Madagascar, no hibernation period is required. Maintain stable temperatures year-round.
  • Nesting: In captivity, small test tubes or acrylic nests work well. The tiny worker size (under 1mm) means passages must be very small. They likely nest in rotting wood or under bark in nature, so a naturalistic setup with moist substrate works well.
• Behavior: Typical Crematogaster behavior, workers are active and agile, constantly running and exploring. They have the characteristic acrobat behavior of raising their abdomen over their head when disturbed. Workers are small but not particularly aggressive. Escape prevention is critical due to their tiny size, they can squeeze through very small gaps. Use fine mesh and tight-fitting lids.
• Common Issues: escape prevention is critical due to tiny worker size, they can squeeze through gaps that larger ants cannot, high humidity requirements can lead to mold if ventilation is poor, balance is essential, lack of species-specific data means care is based on genus inference, some experimentation may be needed, small colony size at maturity makes them vulnerable to stress, handle gently during transfers

Housing and Nest Setup

Due to their very small size, Crematogaster marthae requires careful housing. Test tubes work well for founding colonies, use small diameter tubes with a cotton barrier and water reservoir. The workers are only about 1mm, so any gaps in tubing must be minimal. For established colonies, small acrylic nests or Y-tong style nests with narrow chambers work well. The nest material should retain moisture well, plaster or acrylic with water channels maintains humidity effectively. Provide a small outworld for foraging. Because of their tiny size, use fluon barriers on the edges of any outworld to prevent escapes. ^[1]

Feeding and Diet

Like other Crematogaster species, they likely accept a varied diet. Offer sugar water or honey as a constant energy source, these ants are known to tend aphids for honeydew in the wild. For protein, offer small prey items: fruit flies, small pinhead crickets, or other tiny insects. Given their minute size, prey should be appropriately sized, much smaller than what you'd feed larger ants. Feed protein 2-3 times per week, and keep sugar water available at all times. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Humidity

Maintain temperatures between 24-28°C, reflecting their origin in central Madagascar's tropical forests. A slight temperature gradient is beneficial, allow one area of the nest to be around 22°C while another reaches 28°C so the ants can choose their preferred spot. Humidity should be high at 70-85%. The Andasibe region where they occur is humid year-round, so mist the nest regularly and keep the substrate moist. Use a water source like a test tube with water and a cotton wick. Avoid both drying out and waterlogging, the substrate should feel damp but not soggy. ^[1]

Behavior and Handling

Crematogaster marthae displays typical acrobat ant behavior, when disturbed, workers raise their abdomen over their thorax and head, exposing the glandular tip. This is a defensive display but they are not particularly aggressive. They are active foragers and will quickly explore new areas. The most critical aspect of keeping this species is escape prevention, at under 1mm, workers can squeeze through incredibly small gaps. Use fine mesh (at least 0.5mm or smaller), apply fluon to container edges, and check all connections regularly. When moving colonies, do so gently as small colonies are sensitive to stress. ^[1]

Colony Development

A founding queen will lay eggs after sealing herself in a claustral chamber. Based on typical Crematogaster patterns, expect the first nanitic (first-generation) workers to emerge in 5-8 weeks at optimal temperatures. Nanitics will be smaller than mature workers. Growth rate is moderate, the colony will expand gradually over the first year. Maximum colony size is unknown but likely reaches several hundred workers given the small worker size. Colonies should be fed appropriately for their size, small prey items only.

Frequently Asked Questions

References