Crematogaster scapamaris

Crematogaster scapamaris

Crematogaster scapamaris is a small ant species native to Argentina, specifically found in the Yungas region and surrounding provinces including Córdoba and Santa Fe ^[1][2]. Workers are typical of the genus, small ants with a distinctive heart-shaped gaster that they can raise over their head like an acrobat, which is how they got their common name 'acrobat ants'. The species is endemic to the Yungas of Argentina, a subtropical montane forest ecosystem ^[1]. As a member of the tribe Crematogastrini and functional group Generalized Myrmicinae, these ants are adaptable foragers found in forest environments ^[3]. This is a rarely kept species in captivity with limited documented care information.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Yungas region of Argentina, subtropical montane forest ecosystem. Found in provinces including Córdoba and Santa Fe ^[1][2].
• Colony Type: Colony structure is unconfirmed for this species. The genus Crematogaster is typically polygynous (multiple queens), but specific data for C. scapamaris is not available.
• Size & Growth:
  • Queen: Estimated 6-8mm based on genus patterns, no species-specific measurement found
  • Worker: Estimated 2-4mm based on genus patterns, no species-specific measurement found
  • Colony: Unknown, no colony size data documented for this species
  • Growth: Moderate, estimated based on typical Crematogaster development patterns
  • Development: Estimated 6-8 weeks at optimal temperature based on genus-level data for tropical Crematogaster species (Direct development data unavailable for this species, estimate based on related species patterns)
• Antkeeping:
  • Temperature: Keep around 22-26°C. The Yungas is subtropical montane, so moderate warmth with some humidity is appropriate. A gentle gradient allows ants to self-regulate.
  • Humidity: Moderate to high, subtropical montane forest conditions. Keep nest substrate moist but not waterlogged, with some drier areas available.
  • Diapause: Unknown, no documented hibernation requirement. The Yungas region has mild winters, so they may have reduced activity periods rather than true diapause.
  • Nesting: In nature they likely nest in rotting wood, under bark, or in soil in forest environments. In captivity, a Y-tong (AAC) nest or plaster nest with moderate humidity works well. They may accept test tube setups if given proper space.
• Behavior: Crematogaster ants are active foragers with a curious temperament. They are not particularly aggressive toward keepers but will defend their nest vigorously. Workers are quick-moving and will explore their outworld thoroughly. They have a distinctive defensive behavior, raising their abdomen like an acrobat, which serves as a warning display. Escape risk is moderate due to their small size, use standard barriers. They are generalized foragers and will collect various food sources.
• Common Issues: limited availability, this is a rarely kept species in the antkeeping hobby, no species-specific care documentation means keepers must rely on genus-level guidance, small colony sizes may make them vulnerable to stress, humidity control is important, too dry causes desiccation, too wet causes mold, subtropical origin means they may not tolerate cold temperatures

Natural History and Distribution

Crematogaster scapamaris is endemic to the Yungas region of Argentina, a biodiversity hotspot known for its subtropical montane forests ^[1]. The Yungas spans the eastern slopes of the Andes Mountains, creating a unique ecosystem with high humidity and moderate temperatures year-round. This species has been recorded in multiple Argentine provinces including Córdoba (type locality at Alta Gracia) and Santa Fe ^[2]. The Yungas environment is characterized by dense vegetation, frequent cloud cover, and relatively stable temperatures compared to surrounding areas. As a member of the Generalized Myrmicinae functional group, C. scapamaris occupies a flexible ecological niche as a generalist forager in forest understories ^[3]. The species was originally described by Santschi in 1922 based on specimens collected in Córdoba province.

Nest Preferences and Housing

In their natural habitat within the Yungas forest, Crematogaster scapamaris likely nests in rotting wood, under loose bark, or in soil cavities, typical locations for forest-dwelling Myrmicinae. The montane forest environment provides consistent moisture and moderate temperatures year-round. For captive care, a Y-tong (AAC) nest or plaster formicarium works well for this species, as these materials hold humidity steadily while providing dark, secure chambers. Test tube setups can work if the colony grows large enough, but the small worker size means you should monitor for escape attempts. Provide a moisture gradient within the nest so ants can choose their preferred humidity zone. The outworld should include some vertical surfaces as Crematogaster species often explore upward rather than staying on flat surfaces.

Feeding and Diet

Crematogaster ants are generalist foragers that will accept a variety of foods. In captivity, offer protein sources such as small insects (fruit flies, pinhead crickets, mealworms), and provide sugar sources like honey water or sugar water regularly. They are not specialized predators, so their diet can include both protein and carbohydrates. Feed small amounts every 2-3 days, removing uneaten food to prevent mold. The small worker size means prey items should be appropriately sized, fruit flies and other tiny insects are ideal. Unlike some Crematogaster species that tend aphids, there's no specific documentation of honeydew collection for C. scapamaris, but they likely opportunistically exploit honeydew sources like related species do.

Temperature and Seasonal Care

Based on their origin in the subtropical Yungas region, maintain temperatures around 22-26°C. The Yungas experiences mild temperatures year-round with no extreme cold, so avoid temperatures below 18°C or above 30°C. Room temperature within this range is typically suitable. If your environment is cooler, a heating cable on one side of the nest can create a gentle gradient, always place heating on top of the nest to avoid drying out the substrate. Humidity should be moderate to high, reflecting the cloud forest conditions of their native habitat. There is no documented diapause requirement for this species, but they may show reduced activity during cooler months. Monitor colony behavior, if workers become less active, slightly reduce feeding and avoid disturbing the nest.

Behavior and Temperament

Crematogaster ants are known for their distinctive defensive display, workers can raise their heart-shaped gaster over their head like an acrobat, which serves as a warning to potential threats. They are not among the most aggressive ant species but will readily defend their colony if threatened. Workers are active foragers and will explore their environment thoroughly, making them entertaining to watch. The small worker size (estimated 2-4mm) means they can squeeze through small gaps, use appropriate escape prevention with fine mesh and tight-fitting lids. They are diurnal foragers, actively searching for food during daylight hours. Colonies are likely polygynous (multiple queens) based on typical Crematogaster patterns, though this specific species has not been studied in detail.

Frequently Asked Questions

References