Lordomyrma emarginata

Quick Summary

• Difficulty: Unknown, limited data available
• Origin & Habitat: Philippines (Luzon Island), Mt Isarog National Park, found in leaf litter in humid tropical forest at approximately 13°39'N latitude ^[1][2]
• Colony Type: Colony structure is unconfirmed, only worker caste has been described, no queens have been documented ^[1][2]
• Size & Growth:
  • Queen: Unknown, queen caste has not been described ^[1]
  • Worker: 5.2-5.3mm total length ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data available
  • Development: Unknown, no direct observations of colony development exist (No data on egg-to-worker timeline exists for this species.)
• Antkeeping:
  • Temperature: Based on Philippines origin: aim for 24-28°C (warm tropical conditions). No direct data exists, use a heating cable on one side of the nest to create a gradient if room temperature is below this range.
  • Humidity: High humidity expected based on leaf litter forest floor origin. Keep nest substrate consistently moist but not waterlogged. Mist occasionally and ensure water access is always available.
  • Diapause: Unknown, as a tropical species from the Philippines, hibernation is likely not required. However, no direct observations of seasonal behavior exist.
  • Nesting: Natural nesting: leaf litter/soil in forest floor. Captive options: Y-tong (AAC) nests or plaster nests with moisture reservoirs work well. Provide a naturalistic setup with soil or fine gravel substrate if using a formicarium.
• Behavior: Behavior is poorly documented. Based on genus typical patterns, these are likely docile forest-floor ants that nest in soil or under debris. Workers are medium-sized (5mm) so escape prevention should be moderate, they cannot squeeze through standard test tube cotton but may explore gaps. As Myrmicinae ants, they have a modified stinger used to smear venom rather than pierce, though defensive behavior has not been documented for this species.
• Common Issues: this species has never been kept in captivity, there are no established care protocols or documented captive colonies, only the worker caste is known, queen founding behavior is completely unconfirmed, no diet preferences have been documented, assume omnivorous based on genus patterns, wild-caught colonies may be extremely difficult to locate given their rare distribution, lack of data means keepers must experiment with care conditions without guidance

Species Overview and Discovery

Lordomyrma emarginata was formally described by Robert W. Taylor in 2012 from specimens collected on Mt Isarog in the Philippines ^[1]. The species name 'emarginata' refers to the distinctive emarginate (notched) shape of the petiolar summit when viewed from the front ^[1]. Only two worker specimens have ever been collected, the holotype and a single paratype, both from leaf litter samples taken on different dates in 2006 ^[1]. This makes L. emarginata one of the rarest and least-studied ant species in the antkeeping hobby. The species is sympatric (found in the same area) with two other Lordomyrma species, Lordomyrma diwata and Lordomyrma idianale, on Mt Isarog ^[1].

Natural Habitat and Distribution

This species is known only from Mt Isarog National Park on Luzon Island in the Philippines, at coordinates approximately 13°39'N latitude,123°20'E longitude ^[1]. The type locality is Panicuason Village in Camarines Sur province. The habitat is characterized as humid tropical forest, with the ants collected from leaf litter on the forest floor ^[1]. The Philippines has a tropical climate with high year-round humidity and temperatures typically ranging from 24-32°C. This suggests L. emarginata is adapted to warm, humid conditions similar to other Southeast Asian forest-floor ants.

Identification and Morphology

Workers are relatively distinctive within the genus. They measure 5.2-5.3mm total length ^[1]. The body is generally dark blackish-brown, with the gaster (the rear segment, often called the abdomen in ants) appearing more reddish ^[1]. The antennae and legs are a lighter orange-brown color ^[1]. Key identifying features include: a relatively broad head with a concave vertexal margin, a compact mesosoma (middle body section), strongly elevated promesonotum (the first part of the thorax), small but acute propodeal spines, and the characteristic emarginate petiolar summit ^[1]. The body surface is coarsely rugose (wrinkled) and strongly reflective.

Keeping Lordomyrma emarginata in Captivity

Keeping this species in captivity is essentially experimental since no established protocols exist. Based on the natural habitat (tropical leaf litter), provide warm temperatures around 24-28°C with high humidity. A Y-tong (AAC) nest or plaster nest with a moisture reservoir works well for maintaining humidity. Keep the nest substrate consistently moist but avoid waterlogging. For feeding, offer small insects (fruit flies, pinhead crickets, mealworm pieces) and sugar water or honey as an energy source, though actual acceptance is unconfirmed. Workers are medium-sized at 5mm, so standard escape prevention measures should suffice, but ensure lids fit tightly. This species is not recommended for beginners due to the complete lack of captive care data.

Challenges and Considerations

Prospective keepers should understand that this species presents significant challenges. No captive breeding programs exist, and wild colonies are essentially impossible to locate given the species' extremely limited known range in the Philippines. The queen caste has never been described, so we have no information about colony founding behavior, whether queens are claustral (seal themselves in and live off stored fat) or semi-claustral (must leave to forage) is completely unknown. There is no data on development time, colony size, or typical behavior. Any successful captive keeping of this species would represent a significant contribution to our knowledge. Keepers who obtain colonies should document their observations carefully to help build care knowledge for this rare species.

Frequently Asked Questions

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References