Myrmecia banksi

Myrmecia banksi

Myrmecia banksi is a medium-large bulldog ant native to the coastal regions of New South Wales, Australia. Workers measure 11-13mm and feature a distinctive brassy-green sheen on their head that produces greenish-yellow reflections visible with a hand lens, the feature that gives them the field nickname 'greenhead' ^[1]. Their body is mostly dark brown to black, with reddish-orange markings on the front legs and middle legs ^[1]. This species belongs to the Myrmecia pilosula species complex, commonly known as Jack-jumpers, which are famous for their aggressive temperament and painful stings. The species was formally described in 2015 by Robert Taylor and is named after Joseph Banks, who first scientifically collected Australian ants at Botany Bay in 1770 ^[1].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Coastal and sub-coastal New South Wales from Sydney (Leumeah) south to Batemans Bay, at elevations below 70 meters ^[1]. They inhabit the forest edge areas between Currambene State Forest and Nowra State Forest near South Nowra ^[2].
• Colony Type: Single-queen (monogyne) colonies. Like other Myrmecia in the pilosula complex, colonies likely have one functional queen that produces workers ^[3].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Approximately 13-15mm (estimated from worker size range)
  • Worker: 11.81-13.45mm total length ^[1]
  • Colony: Likely several hundred workers based on related species in the pilosula complex
  • Growth: Moderate
  • Development: Estimated 6-10 weeks based on related Myrmecia species (Development time is temperature-dependent, warmer conditions accelerate development)
• Antkeeping:
  • Temperature: Keep around 22-26°C with a slight gradient. Room temperature within this range works well ^[2].
  • Humidity: Moderate humidity around 50-60%. They prefer somewhat drier conditions compared to tropical ants. Provide a water tube for drinking ^[2].
  • Diapause: Yes, Myrmecia banksi originates from a temperate region and will benefit from a winter rest period of 2-3 months at 10-15°C ^[2].
  • Nesting: Y-tong (AAC) nests work well for these medium-large ants. They also do well in naturalistic setups with soil and flat stones for cover. Provide deep substrate for tunneling ^[2].
• Behavior: Myrmecia banksi is an aggressive, fast-moving ant that forages actively during day and night. They are excellent hunters and readily take down live prey much larger than themselves. Workers are highly defensive of the nest and will attack intruders with little warning. They have a powerful sting that can cause severe pain and, in sensitive individuals, potentially fatal anaphylaxis ^[3]. Escape prevention is important, while not the smallest ants, they are strong climbers and can scale smooth surfaces. Use fluon on the rim of your formicarium and ensure any connections are secure. These ants are not suitable for beginners due to their sting risk and defensive behavior.
• Common Issues: sting hazard, these ants have a painful sting that can cause anaphylaxis in sensitive individuals, handle with extreme caution and wear protective gloves, aggressive temperament, colonies defend vigorously, avoid disturbing the nest and use red film for observation, escape risk, workers are strong climbers, apply fluon to barrier surfaces and check connections regularly, winter mortality, improper hibernation conditions can weaken or kill colonies, ensure stable cool temperatures during diapause, slow founding, claustral queens take time to establish, avoid disturbing founding chambers for the first several months

Housing and Nest Setup

Myrmecia banksi does well in Y-tong (acrylic aerated concrete) nests, which provide the dark, secure environment these ants prefer. The chambers should be appropriately sized for medium-large ants, avoid chambers that are too large as this can stress the colony. A naturalistic setup with a soil-filled container and flat stones or bark for cover also works well and allows you to observe their tunneling behavior. Provide a water tube with cotton as a drinking station, Myrmecia regularly drink water. For the outworld, use a simple foraging area with a secure lid. Apply fluon (insect barrier) to the inner rim of the lid and any tube connections to prevent escapes. These ants are strong climbers and will escape through surprisingly small gaps if not properly secured. ^[1][2]

Feeding and Diet

Myrmecia banksi is a predatory ant that primarily hunts live prey. Offer small insects like fruit flies, small crickets, and mealworms. They will readily take down prey items and dismember them to feed the colony. Unlike some ants, they are not particularly attracted to sugar water or honey, though you can offer these occasionally. Protein-rich foods are essential for brood development. Feed every 2-3 days, adjusting based on how quickly the colony consumes prey. Remove any uneaten prey after 24 hours to prevent mold. A varied diet helps ensure healthy brood development. ^[2]

Temperature and Seasonal Care

Maintain temperatures between 22-26°C for optimal colony activity and brood development. Myrmecia banksi originates from the temperate coastal regions of NSW and will do well at typical room temperature in most homes. A heating cable on one side of the nest can create a gradient if your room runs cool. During winter (roughly June-August in the Southern Hemisphere), reduce temperatures to 10-15°C for a 2-3 month diapause period. This mimics their natural seasonal cycle and helps maintain colony health. Do not feed during deep hibernation, but ensure a small water source is available. Sudden temperature drops should be avoided, cool the colony gradually over 1-2 weeks. ^[1][2]

Safety and Handling

Myrmecia banksi has a powerful sting that delivers venom containing pilosulin 3 and 4 compounds ^[4][5]. While the venom has shown some antibacterial properties in studies, this is not something you want to experience personally. The sting is described as very painful, and like other Jack-jumpers, can trigger severe allergic reactions including anaphylaxis in sensitive individuals ^[3]. Never handle these ants with bare hands. Use soft forceps or gloves when moving colonies. Keep ant farms out of reach of children and pets. If you are stung and experience any symptoms beyond mild localized pain (difficulty breathing, swelling beyond the sting site, dizziness), seek medical attention immediately. When observing your colony, use red film over the nest to reduce disturbance, ants cannot see red light and will remain calmer.

Frequently Asked Questions

References