Pseudonotoncus eurysikos

Pseudonotoncus eurysikos

Pseudonotoncus eurysikos is a small to medium-sized Australian ant species belonging to the subfamily Formicinae. Workers measure approximately 1-1.2mm in head width with a uniform chocolate brown coloration throughout their body ^[1]. The genus Pseudonotoncus is endemic to Australia, found along the east coast from the wet tropics in North Queensland down to southern Victoria, typically inhabiting both wet and dry sclerophyll forests ^[2]. These ants are rarely encountered, with specimens being uncommon in collections. Workers forage primarily on vegetation and tree trunks, actively searching for nectar and honeydew from shrubs both during the day and at night ^[2][3]. The only known nest was found in soil without any covering or visible craters at the entrance ^[1][3].

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Eastern Australia, primarily dry sclerophyll forests in cool climate areas near Melbourne, with additional records from Black Mountain in the Australian Capital Territory and Armidale in New South Wales ^[1][3]. This species prefers cool areas with low rainfall and is found in habitats ranging from rainforest to dry sclerophyll forests ^[2][3].
• Colony Type: Colony structure is unconfirmed. Only the worker caste has been documented, and no queen specimens have been described in scientific literature.
• Size & Growth:
  • Queen: Unknown, queens have not been described in scientific literature
  • Worker: HW 1.03-1.22mm, HL 0.96-1.23mm ^[1]
  • Colony: Unknown, this is a rarely collected species with limited colony data available
  • Growth: Unknown, no development studies exist for this species
  • Development: Unknown, no direct development data available. Based on related Formicinae species in the Melophorini tribe, expect 6-10 weeks at optimal temperature. (Development timeline is estimated from related species in the same tribe. Specific data for P. eurysikos does not exist.)
• Antkeeping:
  • Temperature: Keep in the cool range, around 18-22°C. This species is adapted to cool climate areas of southeastern Australia and should not be kept warm ^[2][3].
  • Humidity: Low to moderate. These ants inhabit dry sclerophyll forests with low rainfall, aim for drier conditions rather than damp. Allow the nest substrate to dry out partially between waterings.
  • Diapause: Likely yes. Based on their cool climate origin in southeastern Australia, expect a winter rest period during the cooler months (roughly May-August in the Southern Hemisphere). Reduce temperatures to around 10-15°C during this period.
  • Nesting: Natural nesting is in soil without covering or visible craters ^[1][3]. In captivity, a naturalistic setup with soil substrate or a Y-tong/plaster nest with dry to moderately damp conditions works well. Avoid overly humid environments.
• Behavior: These ants are relatively docile and non-aggressive. As Formicinae, they do not have a functional stinger but can spray formic acid as a defense ^[1]. Workers forage actively on vegetation and tree trunks, both day and night, searching for nectar and honeydew ^[2]. They have moderate escape risk due to their small size, ensure lids are secure and use appropriate barriers. Their nocturnal foraging activity is notable as many ant species are primarily diurnal.
• Common Issues: limited availability, this is a rarely collected species with few sources in the antkeeping hobby, colony structure unknown, no documented queen or founding behavior makes captive breeding challenging, escape risk due to small size requires proper barriers, cool climate requirements may be difficult to maintain in warmer climates without climate control, very limited biological data makes care recommendations largely inferential rather than confirmed

Housing and Nest Setup

Pseudonotoncus eurysikos nests in soil in the wild, so a naturalistic setup with a soil substrate works best ^[1][3]. Use a mix of sandy soil or a commercial ant nest soil blend. The nest should be kept relatively dry, these ants come from dry sclerophyll forests with low rainfall, so avoid overly damp conditions. A Y-tong (AAC) or plaster nest can also work if you maintain drier humidity levels. Provide a water tube for moisture but do not saturate the nest. Since workers forage on vegetation, include some fake plants or branches in the outworld for them to explore.

Feeding and Diet

In the wild, workers forage on shrubs for nectar and honeydew ^[1][3]. In captivity, offer sugar water, honey, or diluted sugar solutions as a constant food source. They will also accept small insects like fruit flies or pinhead crickets as protein. Since they forage on vegetation, placing food on elevated surfaces or near plants may encourage foraging behavior. Feed protein 2-3 times per week and keep sugar available at all times. Remove uneaten prey after 24 hours to prevent mold.

Temperature and Seasonal Care

This species is adapted to cool climates in southeastern Australia and should be kept in the cool range of 18-22°C ^[2][3]. Avoid keeping them warm, unlike many tropical ant species, they do not require heated setups. During winter, provide a diapause period by reducing temperatures to 10-15°C for several months. This mimics their natural seasonal cycle in the cool climate regions around Melbourne and the ACT. Room temperature in most homes should be suitable, but avoid placing the colony near heat sources or in direct sunlight.

Behavior and Foraging

One notable behavior of P. eurysikos is their ability to forage both during the day and at night ^[2]. Workers are active foragers on vegetation and tree trunks, searching for nectar and honeydew from flowering shrubs. This makes them more active than many ant species that restrict foraging to daylight hours. They are relatively docile and not aggressive toward keepers. As Formicinae ants, they possess formic acid for defense but lack a functional stinger, any bite would be mild. Their small size means they can squeeze through small gaps, so ensure escape prevention is adequate.

Acquisition and Availability

Pseudonotoncus eurysikos is one of the rarer Australian ant species in the hobby. Specimens are uncommon in scientific collections, and finding queens or colonies for sale will be difficult ^[2]. This species is not commonly kept in captivity, so established care protocols in the hobby are limited. If you do acquire a colony, it will likely be through specialized Australian ant keepers or researchers. Be prepared for a learning curve since most care recommendations are inferred from related Melophorini species rather than direct observation of this specific species.

Frequently Asked Questions

References