Myrmica radchenkoi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to the Indian Himalaya, specifically Jammu and Kashmir. Found at elevations from roughly 500m to 2000m in a transition zone between temperate and sub-temperate forests. They nest in leaf litter under patchy Cedrus forests ^{[1] [2] [3] [4]}.
• Colony Type: Unconfirmed, colony structure has not been documented. Based on typical Myrmica patterns they may have single queens, but this is not known for certain.
• Size & Growth:
  • Queen: 6.33mm ^[1]
  • Worker: 5.09mm ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data available
  • Development: Unknown for this species. Based on typical Myrmica genus patterns, roughly 6-10 weeks at warm temperatures. (No specific studies exist. Related Myrmica species take 6-10 weeks from egg to worker in optimal conditions.)
• Antkeeping:
  • Temperature: Keep the nest around 24-28°C with a warm side (up to 30°C) and a cooler side. Their natural nests measured 30°C at 2000m ^[2]. Use a heating cable on one side to create a gradient. Avoid steady temperatures above 32°C.
  • Humidity: Moderate humidity. They come from forest floor leaf litter in a temperate/sub-temperate zone. Keep nest substrate moist but not waterlogged, with some drier areas for the ants to choose from.
  • Diapause: Likely yes. They live at 2000m altitude in the Himalayan temperate zone, where winters are cold. Provide a winter rest period of 2-3 months at 5-10°C.
  • Nesting: Test tubes work for founding. For larger colonies, use Y-tong (AAC) nests, plaster nests, or soil nests with chambers sized for medium ants. They naturally live in leaf litter and soil, so offer a layer of substrate in the outworld.
• Behavior: Typical Myrmica temperament: not aggressive but will defend with a stinger if handled roughly. The sting is mild to moderate. Workers are moderately active foragers. Escape risk is low for a 5mm ant, but use standard barriers like fluon on test tube rims.
• Common Issues: no colony size or growth data makes planning difficult, founding behavior is unconfirmed, you may need to try different methods if queens fail to lay eggs, winter dormancy needs are inferred, not studied, watch colony activity and adjust, very limited captive care info since species was only described in 2011, altitude origin suggests they may be sensitive to overheating, avoid prolonged temperatures above 30°C, unknown whether single or multiple queens can be housed together, do not attempt without more data

Origin and Natural Habitat

Myrmica radchenkoi is endemic to the Indian Himalaya, found only in Jammu and Kashmir. The type locality is Machedi village at about 2000m elevation, collected from leaf litter in a patchy deodar (Cedrus) forest ^{[1] [2]}. This area is a transition between temperate and sub-temperate Himalayan climates, with ambient temperatures of 32°C and nest temperatures of 30°C at the collection site ^[2]. Records also show the species present at lower elevations (500m and 1000m), indicating a broader altitudinal range ^[3]. This high-altitude temperate origin suggests they experience cool winters and require a seasonal cycle.

Identification and Distinguishing Features

Workers are about 5mm long, queens about 6.3mm. They are dark brown with lighter brown legs, mandibles, and antennae ^[1]. The easiest way to identify Myrmica radchenkoi is by its very long propodeal spines and extremely long petiole stalk. The head is longer than wide, with about 16-17 ridges between the frontal carinae. The antennae have 12 segments with a 4-segmented club. Queens have 8 teeth on their mandibles, workers have 7. This species belongs to the inezae group, which lacks a median notch on the clypeus, has very long propodeal spines, and rounded propodeal lobes ^{[1] [5]}. Compared to its close relative Myrmica rigatoi, this species has even longer propodeal spines and a longer petiole peduncle ^[1].

Temperature and Seasonal Care

Field data show that Myrmica radchenkoi nests at 30°C at 2000m altitude ^[2]. In captivity, aim for a nest temperature around 24-28°C with a warm zone reaching up to 30°C. Use a heating cable on one side of the nest to create this gradient. Because they come from a high-altitude temperate zone, they likely need a winter dormancy period. Provide a rest period of 2-3 months at 5-10°C during winter. This is important for long-term colony health and annual reproductive cycles, but has not been directly studied for this species.

Feeding and Nutrition

No specific diet studies exist for Myrmica radchenkoi, but like other Myrmica species they are opportunistic omnivores. Offer protein sources such as fruit flies, small crickets, or mealworms about twice a week. Also provide sugar water, honey, or diluted fruit jam for energy. Since they were collected from leaf litter in a forest, they likely hunt small live prey but will also scavenge. Provide both protein and sugar options, and observe what they prefer ^[6].

Nesting and Housing

For a founding colony, a standard test tube setup with a water reservoir works well. For established colonies, use Y-tong (AAC) nests, plaster nests, or soil nests with medium-sized chambers. In the wild they nest in leaf litter and soil, so provide a layer of substrate in the outworld for natural foraging. The nest should have some moisture retention but also drier areas for the ants to regulate humidity. Avoid completely dry nests or waterlogged conditions ^{[1] [2]}.

Colony Development and Growth

There is no published data on colony development for Myrmica radchenkoi. Based on other Myrmica species, consider the following rough estimates. The queen is a good size (6.3mm) and likely has enough reserves for early development. Expect the first workers (nanitics) roughly 6-10 weeks after founding if kept at around 25-28°C. The growth rate is unknown but likely moderate. Mature colony size is also unknown, probably a few hundred workers based on similar Myrmica species. Be patient with founding colonies, this species was only described in 2011 and very few keepers have experience with it ^[1].

Frequently Asked Questions

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References