Teratomyrmex greavesi

Teratomyrmex greavesi

Teratomyrmex greavesi is a small, distinctive Australian ant known for its unusual appearance. Workers measure 0.66-0.85mm in head width and have a uniform dark brown to almost black coloration throughout their body ^[1]. The most striking feature is their very broad, high pronotum (the section behind the head) with large wing-like projections extending laterally, giving them a unique look among Australian ants ^[1]. Their head is roughly square, widest at the large convex eyes, and their antennae scapes extend about one-third past the back of the head ^[1]. This species is endemic to Australia, found only in a restricted area of extreme south-east Queensland with a single record just across the border in New South Wales ^[1][2]. The genus Teratomyrmex contains only three known species, all limited to forested areas along Australia's east coast ^[3].

Quick Summary

• Difficulty: Unknown, likely Expert
• Origin & Habitat: Extreme south-east Queensland and northern New South Wales, Australia. Found primarily in rainforest habitats, with one record from dry sclerophyll forest. Nests in rotten wood on the ground, forages on low vegetation ^[1][2].
• Colony Type: Unconfirmed, colony structure has not been studied
• Size & Growth:
  • Queen: Unknown, queen measurements not documented
  • Worker: 0.66-0.85mm head width,0.71-0.90mm head length ^[1]
  • Colony: Unknown, colony size has not been documented
  • Growth: Unknown
  • Development: Unknown, development has not been studied (No data available on egg-to-worker development time. Related Melophorini ants typically take 6-10 weeks at optimal temperatures, but this is an estimate.)
• Antkeeping:
  • Temperature: Unconfirmed, likely ambient Australian temperate range (18-25°C). Based on their rainforest origin in south-east Queensland, they likely prefer warmer, humid conditions. Start around 22-24°C and observe colony activity.
  • Humidity: Unconfirmed, likely high humidity given rainforest origin. Keep nest substrate consistently moist but not waterlogged. Provide a humidity gradient so ants can choose their preferred zone.
  • Diapause: Unknown, no data on overwintering requirements. Queensland experiences mild winters, so they may not require a true diapause but may reduce activity in cooler months.
  • Nesting: In nature they nest in rotten wood on the ground ^[2]. In captivity, a naturalistic setup with damp rotten wood or a well-humidified acrylic/plaster nest works well. They likely prefer tight, humid chambers similar to their natural rotten wood nests.
• Behavior: Behavior is poorly documented. They forage on low vegetation rather than the ground, suggesting they may be arboreal or semi-arboreal foragers ^[1][2]. Their large eyes suggest good vision. Escape risk is moderate given their small size, use standard barriers. Aggression levels are unknown. As Formicinae ants, they do not have a functional stinger but may spray formic acid as a defense.
• Common Issues: very limited scientific data makes care recommendations uncertain, no information on founding behavior or colony development, wild-caught colonies may struggle in captivity due to unknown requirements, rainforest origin suggests high humidity needs that can be difficult to maintain, escape prevention needed given small worker size

Appearance and Identification

Teratomyrmex greavesi workers are small ants measuring 0.66-0.85mm in head width and 0.71-0.90mm in head length ^[1]. They have a uniform dark brown to almost black coloration throughout their entire body, with no distinct color patterns ^[1]. The most distinctive feature is their very broad, high pronotum (the first segment of the thorax) which has large wing-like projections extending sideways, this gives them an unmistakable appearance among Australian ants ^[1]. Their head is roughly square, widest at the large convex eyes which are positioned about one-third from the posterior margin of the head ^[1]. The antennae scapes are relatively long, extending about one-third past the posterior margin of the head ^[1]. The propodeum (the rear portion of the thorax) is narrow with two small spines, and the petiole (the waist segment) is narrow and tall with a concave dorsal surface bearing a pair of small spines ^[1]. Their entire body is covered in scattered long hairs, and there is dense short hair (pubescence) pressed against the surface of the head, mesosoma, gaster, and coxae ^[1].

Natural Habitat and Distribution

This species has a very restricted distribution in Australia, found only in extreme south-east Queensland with a single record just across the border in New South Wales ^[1][2]. The majority of collections have come from rainforest habitats, with only one reported collection from dry sclerophyll forest ^[2]. This limited distribution suggests they are specialized to particular forest types. In their natural habitat, they nest in rotten wood on the ground and forage on low vegetation rather than on the ground surface ^[1][2]. The genus Teratomyrmex contains only three known species, and all are limited to forested areas along the east coast of Australia ^[3]. Their preference for foraging on low vegetation suggests they may have some arboreal tendencies, perhaps searching for honeydew or small prey on understory plants.

Housing and Nesting

In nature, Teratomyrmex greavesi nests in rotten wood on the ground ^[2]. For captive care, a naturalistic setup using damp rotten wood or a well-humidified acrylic or plaster nest works best. Given their rainforest origin, they likely require higher humidity than typical temperate ants. Keep the nest substrate consistently moist but not waterlogged, the substrate should feel damp to the touch. You can create a humidity gradient by having one side slightly drier than the other, allowing the ants to choose their preferred zone. Since they forage on low vegetation in the wild, consider adding some vertical elements or plants to their outworld to mimic this. Use appropriately sized chambers, these are small ants and will feel exposed in large open spaces. Standard escape prevention measures should suffice given their size, though very small ants can sometimes squeeze through standard barriers.

Feeding and Diet

Diet has not been specifically documented for this species. As members of the tribe Melophorini, they are likely omnivorous like their relatives in the genus Melophorus. In the wild, their foraging on low vegetation suggests they may collect honeydew from aphids or scale insects, or hunt small soft-bodied prey. For captive care, offer a varied diet including sugar water or honey as an energy source, and protein sources such as small insects (fruit flies, small mealworms, pinhead crickets). Given their small size, prey items should be appropriately sized. Start with small offerings and observe what they accept. Sugar sources should be available at all times, with protein offered 2-3 times per week. Remove uneaten food promptly to prevent mold.

Temperature and Seasonal Care

Temperature requirements are not documented for this species. Based on their origin in south-east Queensland rainforests, they likely prefer warmer conditions, think low-to-mid 20s Celsius. Queensland has a temperate to subtropical climate, so they probably experience moderate temperatures year-round with mild winters. Start around 22-24°C and observe your colony's activity levels. If workers cluster together and show reduced activity, the temperature may be too low. If they avoid the heated area and cluster in cooler zones, it may be too warm. There is no data on whether they require a diapause (winter rest period). Given the mild climate of their native range, they likely do not need a true hibernation but may reduce activity during cooler months. Monitor their behavior and adjust care seasonally based on colony activity.

Behavior and Temperament

Behavior is poorly documented in scientific literature. They forage on low vegetation rather than the ground, which is unusual and suggests they may be semi-arboreal in their foraging habits ^[1][2]. Their large, well-developed eyes suggest they may rely more on vision than many ant species. As members of the subfamily Formicinae, they do not have a functional stinger but can spray formic acid as a defensive mechanism. Aggression levels are unknown. Their small size and unusual morphology make them an interesting species to observe. They are likely not aggressive toward keepers but may be defensive if their nest is disturbed. Standard ant-keeping precautions apply.

Frequently Asked Questions

References