Pseudomyrmex euryblemma

Pseudomyrmex euryblemma

Pseudomyrmex euryblemma is a Neotropical ant species belonging to the Pseudomyrmecinae subfamily. Workers are small at around 5mm with a distinctive broad, rectangular head (HW 0.81-0.98) and dark brown coloration ^[1][2]. This species belongs to the P. pallidus group, characterized by a laterally angulate median clypeal lobe in workers and queens ^[2]. They are found across Central and South America, from Mexico through Costa Rica, Guatemala, Colombia, and into Argentina, French Guiana, and Paraguay ^[2]. P. euryblemma is a member of the P. sericeus group and is often found in forested habitats, including canopy environments ^[3][4].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Neotropical region, found in Costa Rica, Guatemala, Colombia (Antioquia, Cundinamarca, Guainía, Magdalena, Meta, Sucre), Mexico, French Guiana, Paraguay, Argentina, and recently recorded in Pará, Brazil ^[5][6][2]. Found at elevations around 1,500m in Colombia (Medellin area) ^[7]. Inhabits forested areas including canopy microhabitats ^[4].
• Colony Type: Colony structure is not well documented in scientific literature. Based on genus patterns, likely single-queen (monogyne) colonies. Pseudomyrmex species typically have claustral founding where the queen seals herself in to raise the first workers.
• Size & Growth:
  • Queen: Approximately 6-7mm based on genus patterns (not directly measured for this species)
  • Worker: Approximately 5mm ^[1]
  • Colony: Likely small to moderate, possibly several hundred workers based on related species
  • Growth: Moderate, development timeline unconfirmed but likely 6-10 weeks based on genus patterns
  • Development: Estimated 6-10 weeks based on typical Pseudomyrmex development patterns (Direct development data unavailable for this species, estimates based on related species in the genus)
• Antkeeping:
  • Temperature: Keep at 24-28°C. This is a Neotropical species from mid-elevation locations, so they prefer warm conditions. A gentle gradient allowing them to self-regulate is ideal ^[7]
  • Humidity: Moderate to high humidity (60-80%). These ants are found in forest environments and often in canopy microhabitats. Keep the nest substrate moist but not waterlogged ^[4]
  • Diapause: Likely no true diapause required given their tropical distribution. However, slight temperature reduction during winter months may be beneficial if mimicking natural seasonal cycles.
  • Nesting: In nature, Pseudomyrmex species often nest in hollow twigs, stems, or plant domatia. In captivity, a test tube setup works well for founding colonies. For established colonies, a naturalistic setup with hollow twigs or stems, or a Y-tong/plaster nest with narrow chambers mimics their natural arboreal nesting preferences.
• Behavior: Pseudomyrmex euryblemma workers are active foragers. Based on genus behavior, they are likely predatory on small arthropods and may tend aphids for honeydew. Workers are slender and fast-moving. They are not typically aggressive toward keepers but will defend their nest. Escape prevention should be good, they are not extremely small but use standard barrier methods. Their broad head and distinctive morphology makes them relatively easy to identify among ant species.
• Common Issues: Limited availability in the antkeeping hobby, this is not a commonly kept species, Specific nesting requirements, they prefer hollow stems/twigs which may be harder to provide, Humidity management is important, too dry and colonies may fail, too wet can cause mold issues, Limited information on captive care means keepers may need to experiment with conditions, High elevation origins mean they may not tolerate excessive heat

Housing and Nest Setup

Pseudomyrmex euryblemma is an arboreal-nesting species that naturally inhabits hollow twigs, stems, and plant cavities. For captive care, you can start with a standard test tube setup for the founding queen. Once the colony establishes (20-30 workers), consider transitioning to a more naturalistic setup that mimics their natural environment. Hollow bamboo sections, twigs, or a Y-tong nest with narrow chambers work well. The chambers should be appropriately scaled to their 5mm worker size. Avoid overly large, open spaces, they prefer tight, enclosed spaces similar to their natural twig nests. ^[1]

Feeding and Diet

Based on Pseudomyrmex genus behavior, P. euryblemma is likely an omnivorous forager that preys on small arthropods and collects honeydew from aphids and scale insects. In captivity, offer a varied diet including small live prey (fruit flies, pinhead crickets, small mealworms) and sugar sources (honey water, sugar water). Protein-rich foods should be offered regularly, especially for growing colonies. They are active foragers, so place food where workers can easily discover it. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Humidity

As a Neotropical species from mid-elevation locations in Central and South America, P. euryblemma prefers warm, moderately humid conditions. Maintain temperatures between 24-28°C with a gentle gradient allowing the colony to self-regulate. Avoid temperatures below 20°C or above 32°C. Humidity should be kept at 60-80%, this can be achieved by keeping the nest substrate moist (not soggy) and using a water reservoir. Mist the outworld occasionally but avoid constant dampness which promotes mold. Good ventilation is important to prevent stagnant air while maintaining humidity. ^[7]

Colony Development

The colony founding stage for P. euryblemma follows typical Pseudomyrmex patterns, the queen seals herself in a chamber and raises the first workers (nanitics) alone using stored fat reserves. This claustral founding typically takes 6-10 weeks for the first workers to emerge, depending on temperature. Nanitics are smaller than mature workers but will help the colony grow. Growth rate is moderate, a healthy colony may reach 100 workers within the first year under good conditions. Colony size likely maxes out at several hundred workers based on related species in the genus.

Behavior and Temperament

Pseudomyrmex workers are active, slender ants that move quickly when foraging. They are not typically aggressive toward keepers and rarely sting. Workers are effective foragers and will readily discover and recruit to food sources. The species is well-adapted to arboreal life, they are good climbers and may traverse vertical surfaces with ease. Use standard escape prevention measures (fluon barriers work well). Their distinctive broad head and dark brown coloration makes them relatively easy to identify among ant species. ^[2]

Frequently Asked Questions

References