Aphaenogaster famelica

Aphaenogaster famelica

Aphaenogaster famelica is a medium-sized woodland ant native to East Asia. Workers measure between 3.5 and 8 mm, with dark brown to black bodies contrasted by reddish-brown legs, mandibles, and antennae ^[1][2]. They are the most common Aphaenogaster species in Japan, ranging from lowland eastern regions to mountainous areas in the west ^[3]. Unlike their relative Aphaenogaster erabu, foraging workers do not turn their gasters downward ^[3]. They nest in open soil or under stones in woodlands and forest margins ^[3]. These ants are important seed dispersers in their native forests and have been observed using tools to transport food ^[4][5]. Unusually for temperate ants, they remain active during winter on warm days, though they still require a cold period for proper brood development ^[6].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Japan, Korean Peninsula, China, and the Russian Far East (Kuril Islands), found in woodlands, forest edges, and open areas where they nest in soil or under stones ^[3][7][8].
• Colony Type: Single-queen colonies (monogyne) based on typical Aphaenogaster patterns, though specific studies on queen number are unconfirmed.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 8-9 mm (estimated from genus patterns).
  • Worker: 3.5-8.0 mm ^[2][1].
  • Colony: Up to 1000 workers (estimated from genus patterns).
  • Growth: Moderate to slow (temperate species requiring seasonal rest).
  • Development: 8-12 weeks at 25°C (estimated from related temperate Aphaenogaster species). (Development slows significantly during hibernation. First workers (nanitics) may emerge slightly smaller and faster than subsequent broods.)
• Antkeeping:
  • Temperature: Keep at 20-25°C during the active season (spring through autumn). Provide a winter rest period at 5-10°C for 3-4 months (inferred from temperate distribution and winter activity observations) ^[6].
  • Humidity: Moderate humidity around 50-70%. Keep nest soil damp but not waterlogged, with a moisture gradient allowing ants to choose drier or wetter areas.
  • Diapause: Yes, required. Despite occasional winter foraging on warm days, colonies need a sustained cold period for proper brood development and long-term health ^[6].
  • Nesting: In nature they nest in open soil or under flat stones ^[3]. In captivity, use Y-tong nests, plaster nests, or naturalistic setups with a soil/stone layer that allows for tunneling under cover.
• Behavior: Ground-dwelling foragers that collect seeds and small insects. They show moderate activity levels and are not particularly aggressive. Workers may forage on warm winter days but enter a slowed state during true cold periods ^[6]. Escape risk is moderate, while not tiny, they are skilled climbers and require secure lids.
• Common Issues: hibernation must be provided or the colony may fail to develop new brood properly., soil-based nests can develop mold if kept too wet without adequate ventilation., winter activity on warm days can lead to overfeeding if keepers assume the colony is fully active., slow growth rate during the first year can test beginner patience.

Nest Preferences

In their native woodlands, Aphaenogaster famelica nests in open soil or under stones and flat rocks ^[3]. They prefer well-drained but moderately humid locations, often at the edges of forests where sunlight can warm the nest entrance. In captivity, recreate these conditions with a Y-tong or plaster nest that offers tight, dark chambers, or use a naturalistic setup with a layer of soil and flat stones under which they can excavate. Provide a humidity gradient, keep one side of the nest slightly damp while allowing the other side to dry out, letting the ants choose their preferred microclimate. Avoid tall, open spaces, these ants prefer low-ceilinged chambers that mimic the space under stones.

Feeding and Diet

Aphaenogaster famelica are omnivorous scavengers and important seed dispersers. They collect seeds with elaiosomes (fatty attachments) and transport them back to the nest, where they consume the attachment and often discard the seed itself ^[4]. Offer a mix of small seeds (such as poppy or sesame) and protein sources like fruit flies, springtails, or small cricket pieces. These ants also use tools, they have been observed placing debris on liquid food sources like honey water to soak it up, then carrying the soaked material back to the nest ^[5]. You can offer diluted honey water on a piece of cotton or provide it in a shallow dish with pebbles for them to soak.

Temperature and Seasonal Care

During the active season (roughly April to October), maintain the nest at 20-25°C. Aphaenogaster famelica experiences distinct seasons in its native Japan, including cold winters in northern regions like Hokkaido ^[7]. While they may forage on warm winter days ^[6], they require a true hibernation period for brood development. Starting in late autumn, gradually reduce the temperature to 5-10°C for 3-4 months. You can keep them in an unheated room, garage, or refrigerator set to this temperature range. Do not feed during hibernation, but ensure the nest does not completely dry out. Return them to room temperature in early spring to trigger renewed brood development.

Behavior and Temperament

These ants are generally peaceful and deliberate in their movements. They are ground-dwelling foragers that rely on individual scouting rather than mass recruitment trails. Workers vary in size from 3.5 to 8 mm, with larger workers often handling seed transport while smaller workers tend brood ^[2]. They are not escape artists like some smaller species, but their climbing ability and size mean standard escape prevention (Fluon or baby powder barriers) is still necessary. Their winter activity pattern is unusual, unlike many temperate ants that enter complete dormancy, Aphaenogaster famelica workers may emerge to forage on warm winter days, though they will retreat when temperatures drop again ^[6].

Colony Founding

Queens are claustral, meaning they seal themselves in a founding chamber and live entirely on their stored body fat reserves until the first workers hatch. Based on related temperate Aphaenogaster species, expect the first workers to emerge in 8-12 weeks at 25°C. The first workers (nanitics) will be smaller than subsequent generations and will begin foraging immediately. Do not disturb the queen during this period, and do not attempt to feed her, she has everything she needs internally. Once workers arrive, offer small amounts of sugar water and tiny prey items.

Frequently Asked Questions

References