Pseudomyrmex evitus

Pseudomyrmex evitus

Pseudomyrmex evitus is a medium-sized ant measuring 1.15-1.28mm in head width, native to the Neotropical region from southern Mexico to Costa Rica ^[1]. Workers have a distinctive appearance with a broad head (wider than long), elongated eyes, and dense punctulate sculpture that gives their body a dull, opaque finish. They are dark brownish-black with medium-brown appendages ^[1]. This species inhabits tropical moist forests, lowland rainforests, and montane rainforests at elevations between 50-1170 meters, where they nest opportunistically in dead twigs ^[1][2]. Unlike their famous acacia-ant relatives (Pseudomyrmex ferrugineus group), P. evitus has a timid, non-aggressive disposition and does not form mutualistic associations with plants ^[1][2].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical region: southern Mexico through Guatemala, Honduras, Belize to Costa Rica. Found in tropical moist forest, lowland rainforest, lowland rainforest edge, and montane rainforest at elevations 50-1170m ^[1][2].
• Colony Type: Colony structure is not well documented. As a dead twig-nesting generalist, colonies are likely small to moderate in size, similar to other Pseudomyrmex species in the ferrugineus group. Single-queen colonies are probable but not confirmed.
  • Founding: Claustral
• Size & Growth:
  • Queen: Not documented in available literature, related species in the genus typically range 6-10mm
  • Worker: 1.15-1.28mm head width (HW),1.13-1.25mm head length (HL) ^[1]
  • Colony: Likely under 500 workers based on dead twig nesting habits typical of the genus ^[2]
  • Growth: Moderate, inferred from related Pseudomyrmex species
  • Development: 6-10 weeks estimated based on related tropical Pseudomyrmex species (Development timeline is not directly studied for this species, estimate based on genus-level data for similar tropical ants)
• Antkeeping:
  • Temperature: Keep at 24-28°C, these are tropical ants requiring warm conditions. A gentle gradient allowing workers to self-regulate is ideal.
  • Humidity: High humidity (70-85%), think damp tropical forest floor. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: No, being a tropical species from low latitudes, they do not require hibernation or winter dormancy ^[1][2]
  • Nesting: In nature they nest in dead twigs, in captivity they do well in small wooden nests (Y-tong), acrylic nests with narrow chambers, or test tube setups with wood fragments. They prefer tight chambers scaled to their small size.
• Behavior: Timid and non-aggressive, workers have a shy disposition and are not defensive ^[1][2]. They are generalist foragers that search for food on the ground and tree trunks. Workers are small (around 1.2mm) so escape prevention is important, they can slip through small gaps. They are not stinging ants (Pseudomyrmecinae subfamily uses chemical defense rather than stingers).
• Common Issues: escape prevention is critical due to their very small size, use fine mesh and tight-fitting lids, tropical humidity requirements can lead to mold if ventilation is poor, timid behavior means they may be outcompeted by more aggressive ant species if housed in community setups, wild-caught colonies may have parasites that can devastate captive colonies, overheating is a risk, keep away from direct sunlight and strong heating elements

Housing and Nest Setup

Pseudomyrmex evitus is a small ant that nests in dead twigs in the wild, so they do well in setups that mimic these tight, woody cavities. Y-tong (AAC) nests with narrow chambers work well, as do small acrylic nests. You can also use test tubes with small wood fragments or cork inserts to simulate their natural twig nesting ^[1][2]. Because they are tiny (around 1.2mm), ensure all connections and barriers are tight, these ants can escape through surprisingly small gaps. A small outworld connected to the nest allows for feeding space. Keep the nest humid but provide some dry area in the outworld so ants can choose their preferred microclimate.

Temperature and Humidity

Being a tropical species from Mexico and Central America, P. evitus needs warm, humid conditions. Maintain temperatures between 24-28°C, avoid temperatures below 22°C or above 30°C. A heating cable on one side of the nest can create a gentle gradient, but never place the heating directly on the nest as it can cause drying and overheating. Humidity should be high, around 70-85%. The nest substrate should feel consistently damp but never waterlogged. Mist the nest occasionally and monitor for condensation, some condensation is good, but excessive moisture leads to mold. Good ventilation is essential to prevent stagnant air while maintaining humidity. ^[1][2]

Feeding and Diet

Like other Pseudomyrmex species, P. evitus is a generalist that forages for carbohydrates and protein. Offer sugar water, honey, or diluted maple syrup as a constant carbohydrate source. For protein, provide small live prey like fruit flies, pinhead crickets, small mealworms, or other tiny insects. Because they are timid and small, prey items should be appropriately sized, anything larger than they can handle will be ignored. Feed protein 2-3 times per week, and keep sugar sources available at all times. Remove uneaten prey after 24-48 hours to prevent mold. ^[1]

Behavior and Temperament

This species is known for its timid, non-aggressive disposition, quite different from the aggressive acacia-ant relatives in the same species group ^[1][2]. Workers are shy and will retreat from threats rather than attack. This makes them a peaceful colony to keep, but also means they may be bullied by more aggressive ant species if housed in community setups. They are generalist foragers that search for food on the ground and tree trunks in the wild. Workers are small (around 1.2mm) and while they are not known escape artists, their tiny size means they can slip through small gaps if escape prevention is not thorough.

Colony Development

P. evitus is not a fast-growing species. Based on related Pseudomyrmex species, expect 6-10 weeks from egg to first worker (nanitic) at optimal temperature. Colonies likely reach several hundred workers over time, living in small twig nests in the wild ^[2]. The queen is not documented in size but related species are 6-10mm. Founding queens seal themselves in (claustral founding) and raise their first brood alone, living off stored fat reserves. Be patient with colony growth, these are not rapid growers like some tropical ants.

Frequently Asked Questions

References