Pseudomyrmex lisus

Pseudomyrmex lisus

Pseudomyrmex lisus is a small, slender ant belonging to the subfamily Pseudomyrmecinae. Workers are small with the head width typically under 0.86mm, giving them a delicate appearance compared to many other Neotropical ants. They have the characteristic long legs and relatively large eyes typical of Pseudomyrmex species. This species is found across the northern South American continent, from Costa Rica through Colombia, Peru, and into southern regions including Paraguay and northern Argentina ^[1][2].

As a Pseudomyrmex species, these ants are likely arboreal or semi-arboreal, nesting in hollow twigs, stems, or under bark in their tropical forest habitat. The species was originally described as a variety of Pseudomyrmex sericea in 1944 before being elevated to full species status in 2007. Despite its relatively wide distribution, specific biological details about nesting behavior, colony size, and detailed care requirements remain poorly documented in scientific literature.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical region, found in tropical and subtropical forests across Colombia, Costa Rica, Peru, Paraguay, Argentina, French Guiana, and Honduras. In Colombia, recorded at elevations from near sea level up to at least 980m in the Andes region (Antioquia). Typical habitat is tropical dry forest and likely forested areas with suitable nesting structures like hollow twigs or stems ^[1][2][3].
• Colony Type: Unconfirmed, colony structure has not been documented for this species. Based on genus patterns, Pseudomyrmex species typically form small to moderate colonies in twig nests.
• Size & Growth:
  • Queen: Undocumented for this species, genus members typically range from 6-10mm
  • Worker: Small, head width under 0.86mm based on species description ^[2]
  • Colony: Unknown, likely small to moderate based on genus patterns
  • Growth: Unknown
  • Development: Unconfirmed, likely 4-8 weeks based on typical Pseudomyrmex development patterns in tropical conditions (Development timeline has not been specifically studied for this species. Tropical Pseudomyrmex species typically develop faster than temperate ants due to year-round warm conditions.)
• Antkeeping:
  • Temperature: Aim for 24-28°C, this matches their Neotropical origin and typical Pseudomyrmex preferences. A slight gradient allowing cooler areas around 22°C is beneficial. Avoid temperatures below 20°C for extended periods.
  • Humidity: Moderate to high, think tropical forest conditions. Keep nest substrate lightly moist but not waterlogged, with some drier areas available. Mist occasionally and provide a water source.
  • Diapause: Unlikely, as a tropical species, they probably do not require a true hibernation period. However, they may show reduced activity during cooler or drier seasons in their natural range.
  • Nesting: Based on genus behavior, they likely prefer arboreal or semi-arboreal setups. A naturalistic setup with twigs, cork, or a Y-tong/plaster nest with narrow chambers works well. Avoid large, open spaces, they prefer tight, enclosed spaces similar to their natural twig nests.
• Behavior: Likely active foragers with typical Pseudomyrmex alertness. Many Pseudomyrmex species are quick-moving and can be defensive when their nest is disturbed. They probably forage individually or in small groups rather than forming large raiding columns. Escape prevention is important given their small size, use fine mesh barriers and tight-fitting lids. Their small size means they can slip through surprisingly small gaps.
• Common Issues: small size makes escape prevention critical, use fine mesh and check for gaps, limited specific care information means you'll be learning as you go, observe colony behavior closely, tropical species may struggle in air-conditioned rooms or cool climates, wild-caught colonies may carry parasites or be stressed from collection, quarantine and monitor, slow colony growth is normal, don't overfeed or over-stimulate the colony

Housing and Nest Setup

Pseudomyrmex lisus is a small ant that will do best in setups that mimic their natural arboreal nesting habits. A Y-tong (acrylic) nest with narrow chambers works well, as does a plaster or naturalistic setup with small twigs and cork pieces. The chambers should be relatively tight, these ants prefer cozy, enclosed spaces rather than large open areas. Given their small size, ensure all connections and barriers are secure. A small outworld area for foraging is sufficient, they don't need extensive space. Some keepers have success with cork bark setups where the ants can nest in natural hollows. ^[2]

Feeding and Diet

Based on typical Pseudomyrmex behavior, this species is likely omnivorous with a preference for protein. They probably forage for small insects and arthropods in nature, and likely also tend aphids or collect honeydew from planthoppers. In captivity, offer small live prey like fruit flies, pinhead crickets, or small mealworms. Sugar sources are usually accepted, offer sugar water, honey, or diluted honey water regularly. A varied diet helps ensure colony health. Feed small amounts every 2-3 days and remove uneaten prey within 24 hours to prevent mold.

Temperature and Humidity

As a Neotropical species from regions like Colombia, Peru, and Costa Rica, Pseudomyrmex lisus needs warm, stable conditions. Aim for temperatures between 24-28°C in the nest area, with a slight gradient allowing workers to self-regulate. Room temperature around 22-24°C may be sufficient in warmer climates, but a heating cable or mat on one side of the nest can help maintain optimal conditions. Humidity should be moderate, think tropical forest floor. Keep the nest substrate lightly moist but not saturated, and provide a water source. Avoid cold drafts and air conditioning that might drop temperatures below their comfort zone. ^[3][1]

Colony Establishment and Growth

Starting a colony of Pseudomyrmex lisus can be challenging since this species is rarely available in the antkeeping hobby. If you obtain a founding queen, she will likely seal herself in a small chamber (claustral founding) and survive on stored fat reserves until her first workers emerge. The initial brood development may take 4-8 weeks under optimal conditions, but specific timelines for this species are unconfirmed. Once the first workers (nanitics) arrive, the colony will begin foraging and growing. Growth is likely moderate, expect several months before you see significant numbers. Patience is key with this species.

Behavior and Observation

Pseudomyrmex ants are known for their alertness and quick movements. Workers are likely active foragers that search individually or in small groups rather than forming large columns. They probably defend their nest actively, many Pseudomyrmex species will bite if threatened. Watching their foraging behavior can be fascinating as they quickly patrol the outworld searching for prey and sugar sources. Their small size makes them excellent escape artists, always use fine mesh on any ventilation and check for gaps in your setup regularly. A well-established colony will show constant activity in the foraging area.

Frequently Asked Questions

References