Pseudomyrmex beccarii

Pseudomyrmex beccarii

Pseudomyrmex beccarii is a slender, elongated ant species belonging to the subfamily Pseudomyrmecinae. Workers measure approximately 5-6mm with a distinctive long-legged appearance typical of this genus, often called 'twig ants' due to their preference for nesting in hollow plant stems and twigs. The species features a gradually rounded propodeum (the section behind the mesonotum) and typically lacks erect hairs on the petiolar node, though pale golden hairs may be present when they occur ^[1]. This ant is native to the Neotropical region, with confirmed records across northern South America including Brazil, French Guiana, Guyana, Peru, and Colombia's Magdalena region ^[2][3][4]. Little specific biological data exists for this species, but Pseudomyrmex ants in general are known for their arboreal nesting habits and active foraging behaviors.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical rainforests of South America, confirmed in Brazil (Pará state multiple locations), French Guiana, Guyana, Peru (San Martín), and Colombia (Magdalena). They inhabit tropical forest environments where they typically nest in hollow twigs, dead branches, and plant cavities in the canopy ^[2][3][4].
• Colony Type: Colony structure is unconfirmed. The genus Pseudomyrmex typically forms single-queen (monogyne) colonies, but specific data for P. beccarii is not available.
• Size & Growth:
  • Queen: Unknown, not directly measured in available literature
  • Worker: Approximately 5-6mm based on head width measurements of HW 0.95-1.06 ^[1]
  • Colony: Unknown, no colony size data available for this species
  • Growth: Unknown, no development data available for this species
  • Development: Unconfirmed, no direct development data exists for this species. Based on typical Pseudomyrmecinae patterns, expect 6-10 weeks at tropical temperatures, but this is an estimate. (Development timeline is unconfirmed for this specific species.)
• Antkeeping:
  • Temperature: Keep at tropical room temperature, aim for 24-28°C. This range aligns with their Neotropical forest origin where temperatures remain consistently warm year-round. A slight gradient is beneficial if possible.
  • Humidity: Moderate to high humidity (60-80%) is recommended, reflecting their arboreal forest habitat. Provide a water tube and maintain some moisture in the outworld. Avoid overly dry conditions.
  • Diapause: No, these are tropical ants that do not require hibernation. Maintain consistent temperatures year-round.
  • Nesting: Arboreal specialists, they naturally nest in hollow twigs, dead branches, and plant stems. In captivity, they do well in Y-tong (AAC) nests or plaster nests with narrow chambers. Providing some vertical space and twigs/branches in the outworld mimics their natural arboreal habitat. They prefer tight, enclosed spaces scaled to their body size.
• Behavior: Pseudomyrmex ants are typically active foragers with good vision, they actively hunt for prey rather than relying solely on honeydew collection. Workers are slender and fast-moving, with good escape abilities. They may be defensive when threatened but are not particularly aggressive toward keepers. Their small size (5-6mm workers) means escape prevention should be taken seriously, they can squeeze through small gaps. These ants are diurnal and often forage during daylight hours.
• Common Issues: limited data makes care recommendations uncertain, this is a poorly documented species, escape prevention is important despite their small size, they are active and fast, arboreal nature means they need vertical space and natural nesting options, tropical requirements mean they cannot tolerate cool temperatures, no specific diet data exists, keepers must experiment with accepted foods

Natural History and Distribution

Pseudomyrmex beccarii is a Neotropical ant species with a distribution spanning northern South America. Specimens have been recorded from multiple locations in Brazil's Pará state, including Belém, Almeirim, Jacundá, Melgaço, Oriximiná, Parauapebas, São João de Pirabas, and Vitória do Xingu ^[2]. The species has also been documented in Peru's San Martín region ^[3], Colombia's Magdalena area ^[4][1], French Guiana, and Guyana ^[5]. This wide but patchy distribution across the Amazon basin and surrounding regions suggests the species thrives in tropical rainforest environments, likely in canopy or forest edge habitats where nesting sites in dead wood are abundant.

Identification and Morphology

Workers of Pseudomyrmex beccarii measure approximately 5-6mm in total length, with a head width (HW) of 0.95-1.06mm, placing them among the larger species within the genus ^[1]. The species can be identified by its characteristic gradually rounded propodeum (the dorsal face rounds smoothly into the posterior face without sharp angles) and the typically bare petiolar node, which may occasionally have pale golden erect setae if present ^[1]. Like all Pseudomyrmecinae, they have a slender, elongated body with long legs adapted for active foraging. The genus is distinguished by their large eyes and generally pale to reddish-brown coloration.

Housing and Nesting

Pseudomyrmex ants are arboreal by nature, naturally nesting in hollow twigs, dead branches, and plant stems in the forest canopy. For captive care, provide a Y-tong (AAC) nest or plaster formicarium with chambers scaled to their 5-6mm size. The nest should have narrow, tight-fitting chambers that mimic the enclosed spaces they would naturally use. In the outworld, include vertical elements like twigs, branches, or cork bark to satisfy their arboreal instincts. A water tube should be provided for humidity. These ants do not require large spaces, a modest outworld with proper climbing structures works well. Ensure excellent escape prevention as they are active and can squeeze through surprisingly small gaps.

Temperature and Humidity

As tropical ants from the Neotropical region, Pseudomyrmex beccarii requires warm, humid conditions. Maintain temperatures between 24-28°C, avoiding any prolonged drops below 22°C. Room temperature in most homes should suffice, but a heating cable on one side of the nest can help if your space runs cool. Humidity should be moderate to high (60-80%), keep the nest substrate slightly moist but not waterlogged. A water tube provides a constant humidity source. These ants do not require diapause or winter cooling, they are active year-round in their tropical habitat.

Feeding and Diet

Specific dietary preferences for P. beccarii have not been documented in scientific literature. However, Pseudomyrmex ants are typically active predators and foragers. Offer a varied diet including sugar water or honey as an energy source, and protein sources such as small insects (fruit flies, small crickets, mealworms). Live prey is likely preferred given their active foraging nature. Start with small prey items and observe what they accept. Sugar water should always be available. Feed every 2-3 days, removing uneaten prey after 24 hours to prevent mold.

Colony Establishment

Colony founding behavior for Pseudomyrmex beccarii has not been directly documented. Most species in the genus Pseudomyrmex are claustral, meaning the queen seals herself in a chamber and raises the first workers entirely on her stored body reserves without foraging. However, this specific behavior has not been confirmed for P. beccarii. If you obtain a founding queen, provide a small test tube setup with water (via cotton) and place it in a warm, humid location. Do not feed the founding queen, wait until the first workers (nanitics) emerge before offering food. Colony growth is expected to be gradual, with initial broods taking several weeks to develop.

Frequently Asked Questions

References