Pseudomyrmex cordiae

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical region, Colombia (Antioquia, Cundinamarca, Meta, Tolima), Peru (type locality), Bolivia, and Brazil (Pará). They are generalist twig-nesting ants that inhabit hollow twigs and branches, particularly in Cordia trees ^[2][1][6].
• Colony Type: Colony structure is unconfirmed. Based on typical Pseudomyrmex patterns, they likely form single-queen colonies (monogyne), but this has not been documented for this species.
• Size & Growth:
  • Queen: Size data unavailable
  • Worker: Size data unavailable
  • Colony: Unconfirmed, likely up to several hundred workers based on genus patterns
  • Growth: Moderate
  • Development: Unconfirmed, estimated 6-10 weeks based on related Pseudomyrmex species in the sericeus group (Development time is estimated from genus-level data, specific measurements for Pseudomyrmex cordiae are not available.)
• Antkeeping:
  • Temperature: Keep warm at 24-28°C. These tropical ants need stable warmth, avoid temperatures below 20°C. Use a heating cable on one side of the nest to create a gradient.
  • Humidity: Moderate. Keep the nest substrate moderately moist but not wet. Provide a test tube water source for drinking.
  • Diapause: No, they are tropical and do not need hibernation. Keep temperatures consistent year-round.
  • Nesting: Use a Y-tong (aerated concrete) nest with narrow chambers, or provide natural twigs and branches with pre-drilled holes. These arboreal ants prefer tight, enclosed spaces that mimic hollow twigs. Avoid large, open formicaria.
• Behavior: Pseudomyrmex ants are alert, active, and defend their nest aggressively. Workers are slender, fast-moving, and have good vision. They can deliver a mild sting if threatened. Escape prevention is critical, they can squeeze through tiny gaps. Generalist foragers that likely hunt small insects and tend aphids for honeydew.
• Common Issues: tropical temperature requirements mean colonies can struggle in cool rooms or air-conditioned spaces, use heating year-round., arboreal nesting needs appropriate vertical space and climbing structures, provide branches or vertical chambers., escape risk is high due to small size and slender bodies, seal all gaps tightly., limited specific data means founding and development may have unexpected challenges, prepare for adaptions., wild-caught colonies may carry parasites, quarantine new colonies before introducing to permanent setup.

Nest Preferences and Housing

Pseudomyrmex cordiae naturally nests in hollow twigs and branches, especially in Cordia trees ^[2][1]. In captivity, mimic these conditions. A Y-tong (aerated concrete) nest with narrow, connected chambers works well, or you can use natural twigs with pre-drilled cavities connected to a foraging area. The key is providing tight, enclosed spaces, they avoid open areas. Provide vertical climbing space, as they are arboreal. Avoid deep substrate, they prefer dry, enclosed chambers. Attach a small test tube water source to the outworld for drinking.

Feeding and Diet

Like other Pseudomyrmex species, Pseudomyrmex cordiae is likely a generalist forager. Offer constant sugar water (1:3 sugar water ratio) or diluted honey. For protein, provide small insects such as fruit flies, small crickets, or mealworm pieces. Feed protein 2-3 times per week and remove uneaten prey after 24 hours. They may also tend aphids for honeydew if available. Specific dietary preferences for this species have not been studied, but genus-level observations suggest opportunistic feeding.

Temperature and Seasonal Care

As Neotropical ants, Pseudomyrmex cordiae needs warm temperatures between 24-28°C. Keep them away from air conditioning or drafts. A heating cable on one side of the nest provides a gradient. They do not require diapause, maintain consistent warmth year-round. Extended drops below 20°C can be harmful. ^[2]

Behavior and Temperament

Pseudomyrmex ants are alert, active, and aggressive nest defenders. Workers are fast-moving with good vision. They can sting when threatened, but the sting is mild and not dangerous to humans. Their small size means they can escape through tiny gaps, use tight lids and barriers like fluon. Provide climbing structures in the outworld to encourage natural foraging behavior. ^[2]

Colony Establishment

Founding behavior for Pseudomyrmex cordiae is unconfirmed. Based on typical Pseudomyrmex patterns, queens likely seal themselves into a small chamber (claustral founding) and survive on stored reserves until first workers emerge. Provide a small-diameter test tube with a water reservoir, placed in a dark, quiet spot. Do not disturb the queen during founding. First workers (nanitics) will be smaller than mature workers. Once workers appear, connect the nest to a foraging area and begin feeding. Colony growth is moderate.

Frequently Asked Questions

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References