Lordomyrma idianale

Lordomyrma idianale

Lordomyrma idianale is a small, beautifully sculptured myrmicine ant endemic to the Philippines, specifically southern Luzon. Workers measure 3.2-3.5mm with a distinctive dark mahogany body and lighter reddish-brown antennae and legs ^[1]. The species is named after Idianale, the ancient Luzonese Tagalog goddess of living things ^[1]. It was previously designated as Lordomyrma PH01 in earlier surveys before being formally described by Taylor in 2012 ^[1]. This ant is readily distinguished by its intense reticulate-rugose sculpturation covering most body surfaces, with smooth and shining interspaces giving it a uniquely textured appearance among related species ^[1]. It is smaller than its sympatric relative L. emarginata and more closely conforms to the azumai configuration ^[1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to the Philippines, specifically southern Luzon. Found in rainforest habitats at elevations from near summit level to 300m, including Mt Isarog National Park in Camarines Sur, Mt Makiling in Laguna, and the Philippine National Botanic Garden near Real ^[1]. This is a habitat specialist restricted to primary forest, it has not been found in secondary forest or rubber plantations ^[2]. They nest between volcanic rocks in the rainforest ^[1].
• Colony Type: Unconfirmed. Colony structure (single-queen or multi-queen) has not been documented in scientific literature for this species.
• Size & Growth:
  • Queen: Not yet described in scientific literature, queen measurements unavailable
  • Worker: 3.2-3.5mm total length,0.69-0.76mm head width ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, development times have not been studied
  • Development: Estimated 6-8 weeks based on typical Myrmicinae development at tropical temperatures (Direct development data unavailable for this species, estimate based on genus-level patterns for small tropical Myrmicinae)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a tropical rainforest species from the Philippines, they require warm conditions. A heating cable on one side of the nest can create a gentle gradient if room temperature falls below this range.
  • Humidity: High humidity required, aim for 70-85%. This rainforest species naturally lives in damp conditions between volcanic rocks. Keep the nest substrate consistently moist but not waterlogged. Provide a water tube as a humidity source.
  • Diapause: No, as a tropical species from the Philippines, they do not require hibernation. Maintain warm conditions year-round.
  • Nesting: In captivity, they do well in Y-tong (AAC) nests or plaster nests that retain moisture. Their small size and preference for humid conditions makes acrylic test tube setups less ideal. Provide narrow chambers scaled to their 3mm worker size. Naturalistic setups with damp substrate and hiding spots also work well.
• Behavior: Not well documented in scientific literature. Based on genus-level observations, Lordomyrma species are generally non-aggressive, cryptic ants that nest in small cavities in rotting wood or under stones. Workers are small and likely forage individually or in small groups on the forest floor. Their intense sculpturation suggests they may be more heavily armored than smooth-bodied Myrmicinae. Escape prevention should be considered due to their small 3mm size, use fine mesh barriers. Whether they possess a functional stinger is unknown, but most small Myrmicinae can sting though it may not penetrate human skin.
• Common Issues: high humidity management is critical, too dry and colonies will fail, but too wet causes mold problems, small size makes escape prevention important, use tight-fitting lids and fine mesh, wild-caught colonies may be difficult to establish due to unknown founding requirements, tropical species cannot tolerate cool temperatures, keep above 24°C, habitat specialist may have specific substrate preferences not yet understood

Natural History and Distribution

Lordomyrma idianale is endemic to the Philippines, known only from southern Luzon. The species has been collected from three main localities: Mt Isarog National Park in Camarines Sur (the type locality), Mt Makiling in Laguna, and the Philippine National Botanic Garden approximately 28km south of Real ^[1]. They inhabit rainforest environments at elevations ranging from near mountain summit to around 300 meters ^[1]. This is a habitat specialist restricted to primary forest, research shows they occupy only primary forest regions and have not been found in secondary forest or rubber plantations ^[2]. In their natural habitat, they nest between volcanic rocks, taking advantage of the moist, protected microclimates that the rocky terrain provides ^[1]. On Mt Isarog, they occur sympatrically with two other Lordomyrma species: L. diwata and L. emarginata ^[1]. The species was previously referred to as Lordomyrma PH01 in earlier surveys before being formally described by Taylor in 2012 ^[1].

Identification and Appearance

Workers of Lordomyrma idianale are small ants measuring 3.2-3.5mm in total length, with head widths of 0.69-0.76mm ^[1]. They have a distinctive dark mahogany body coloration, with their antennae and legs being a lighter reddish-brown ^[1]. The species is readily distinguished by its intense sculpturation, the pre-gastral body surfaces are almost entirely reticulate-rugose, though the interspaces are smooth and shining, creating a beautiful contrast ^[1]. There are incorporated traces of longitudinal striae between the antennal scrobes ^[1]. The propodeal spines are acute but relatively small, proportionately about half as long as in the similar species L. azumai ^[1]. The metanotal groove features several raised transverse ribs ^[1]. The gaster is smooth and shining with minutely sculptured stellae at the hair bases ^[1]. In frontal view, the head is less expanded behind the eyes compared to L. azumai, with a weakly convex vertexal margin ^[1].

Housing and Nest Setup

Due to their small size and humidity requirements, Y-tong (AAC) nests or plaster-based formicaria work best for keeping Lordomyrma idianale. These nest types maintain moisture well while providing appropriately scaled chambers for their 3mm workers. Avoid large, open acrylic setups that dry out quickly. The nest should have narrow passages and small chambers scaled to their tiny size. Place a water tube attached to the setup to provide humidity through evaporation. Because they are a rainforest species, the nest substrate should be kept consistently moist, think damp forest floor conditions. You can provide a small soil section or substrate area within the outworld for foraging enrichment. Ensure excellent escape prevention, their small 3mm size means they can squeeze through gaps that would hold larger ants. Use fine mesh on any ventilation holes and ensure all connections are tight-fitting.

Feeding and Diet

The specific dietary preferences of Lordomyrma idianale have not been documented in scientific literature. Based on typical Lordomyrma and general Myrmicinae behavior, they are likely omnivorous with a preference for small protein sources. In captivity, offer small live prey such as fruit flies, pinhead crickets, and small mealworms. They will likely accept sugar water or honey as an energy source, though protein should form the majority of their diet. Feed small amounts every 2-3 days, removing any uneaten prey after 24 hours to prevent mold. As a small rainforest ant, they probably forage individually or in small groups rather than organizing large food raids. Place food items in the outworld where foragers can discover them.

Temperature and Seasonal Care

As a tropical species from the Philippines, Lordomyrma idianale requires warm conditions year-round. Maintain temperatures between 24-28°C (75-82°F). They have no diapause requirement and should not be exposed to cool temperatures. If your room temperature falls below this range, use a heating cable placed on one side of the nest to create a gentle thermal gradient. Always place heating elements on top of the nest, not underneath, to avoid evaporating moisture too quickly. Monitor colony behavior, if workers cluster near the heated area, the temperature is appropriate, if they avoid the heated section, it may be too warm. The consistent warmth of their native rainforest habitat in Luzon means they do not tolerate temperature fluctuations well.

Challenges and Common Issues

The primary challenge with keeping Lordomyrma idianale is replicating their specific humidity requirements. As a rainforest species from between volcanic rocks, they need consistently high humidity (70-85%) without creating stagnant, mold-prone conditions. Balance is key, the substrate should feel damp to the touch but not be waterlogged. Their small 3mm size also makes escape prevention critical, inspect all connections and use fine mesh on any openings. This is a poorly studied species, meaning established care protocols don't exist. Wild-caught colonies may be difficult to establish because we don't fully understand their founding requirements. Start with a small colony and be patient, growth rates are unknown but likely slow for such a small species. If the colony seems stressed (workers avoiding the nest, excessive mortality), check temperature and humidity levels first.

Frequently Asked Questions

References