Mycetomoellerius atlanticus

Mycetomoellerius atlanticus

Mycetomoellerius atlanticus is a small to medium-sized fungus-growing ant native to the Atlantic coast of Brazil. Workers measure 4.3-5.6mm and have a distinctive light yellow to yellowish-brown coloration with darker spots on the head, mesosoma, and gaster, giving them a smudged appearance ^[1]. Like all Attini tribe ants, they cultivate fungus as their primary food source. This species belongs to the Jamaicensis group, characterized by their antennal scrobes that reach the posterior margin of the head and their spiny projections on the pronotum and mesonotum ^[1]. They are found exclusively in coastal restinga habitats in eastern Brazil, where they nest in sandy soils in coastal dunes ^[1].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Eastern Brazil (Bahia, Espírito Santo, Rio de Janeiro), specifically coastal restinga habitats and sandy coastal dunes ^[1][2]. This species is endemic to the Atlantic Forest domain ^[1].
• Colony Type: Colony structure is unconfirmed. Only the worker caste has been described, queens and males remain unknown ^[3]. As a fungus-growing ant in the Attini tribe, colonies likely develop similarly to other Mycetomoellerius species, but specific colony structure has not been documented.
• Size & Growth:
  • Queen: Unknown, queen caste has not been described ^[3]
  • Worker: 4.3-5.6 mm total length (workers) ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, growth rate has not been documented
  • Development: Unknown, development timeline has not been studied for this species (Based on typical Attini patterns, development likely takes several months, but this is an estimate.)
• Antkeeping:
  • Temperature: Keep at warm tropical temperatures around 24-28°C. This species is from coastal Brazil, so they expect warmth year-round. Use a heating cable on one side of the nest to create a gradient if room temperature is below this range.
  • Humidity: Moderate to high humidity. As a coastal species from restinga habitats, they likely prefer humid conditions. Keep the nest substrate consistently moist but not waterlogged, with some drier areas available for the fungus garden.
  • Diapause: No, this is a tropical species from Brazil that does not experience cold winters. They do not require hibernation or diapause.
  • Nesting: In the wild, workers build nests in sandy soils in coastal dunes ^[1]. In captivity, a naturalistic setup with moist sandy substrate or a well-humidified plaster/acrylic nest works well. The nest should allow space for a fungus garden chamber.
• Behavior: As fungus-growing ants, they are not aggressive and rely on their fungal cultivar for sustenance. Workers forage for plant material to feed their fungus. They are not known to sting and pose no danger to keepers. Escape risk is moderate, they are small ants but not particularly prone to escaping when given proper containment.
• Common Issues: Fungus garden maintenance is critical, the colony depends entirely on their fungal cultivar, which can fail if conditions are wrong, Wild-caught colonies may carry Escovopsis fungal parasites that can destroy the fungus garden ^[4], Unknown queen and mating biology makes captive breeding challenging, Limited availability, this species is rarely available in the antkeeping hobby, Specific humidity and temperature requirements are poorly documented, requiring careful observation

Fungus-Growing Biology

Mycetomoellerius atlanticus belongs to the Attini tribe, commonly known as fungus-growing ants. These ants have a unique agricultural symbiosis, they cultivate a specific fungus as their primary food source. The workers forage for plant material (dead leaves, flowers, fruit) and feed it to the fungus, which they tend in a specialized garden chamber within their nest ^[4]. This species is associated with Escovopsis, a fungal parasite that can attack the ant's fungal cultivar, and also carries beneficial Pseudonocardia actinobacteria on their cuticle that help protect the fungus garden from parasites ^[4]. Keeping this species requires understanding and maintaining this delicate fungal symbiosis.

Natural Habitat and Distribution

This species is endemic to the Atlantic Forest domain of eastern Brazil, found in the states of Bahia, Espírito Santo, and Rio de Janeiro ^[1]. It is the most common Mycetomoellerius species in the Restinga da Marambaia area ^[1]. Restinga is a unique coastal habitat with sandy soils and scrub vegetation. Workers build their nests in sandy soils within coastal dunes ^[1]. This coastal distribution suggests they are adapted to humid, warm conditions with access to abundant plant material for their fungus garden.

Feeding and Nutrition

As fungus-growing ants, they do not eat typical ant foods like sugar water or insects directly. Instead, they require a constant supply of fresh plant material to feed their fungal cultivar. Offer small pieces of fresh leaves, flower petals, fruit, or other organic plant matter regularly. The quality and variety of plant material directly affects the health of the fungus garden. Avoid feeding directly to the ants, they will process plant material and feed it to the fungus. Remove any uneaten plant material before it molds, as mold can destroy the fungus garden. Do not offer sugar water or honey, as this is not part of their natural diet.

Nest Setup and Housing

In captivity, these ants need a nest setup that accommodates both the colony and their fungus garden. A naturalistic setup with a chamber filled with moist sandy substrate works well, mimicking their natural coastal dune nesting behavior ^[1]. Alternatively, a well-humidified plaster or acrylic nest with a dedicated garden chamber can work. The nest should maintain high humidity without becoming waterlogged. Provide an outworld area where workers can forage for plant material you add. Use escape prevention appropriate for their small size, they are around 5mm so standard barriers should work, but ensure all connections are secure.

Temperature and Seasonal Care

As a tropical species from coastal Brazil, Mycetomoellerius atlanticus requires warm temperatures year-round. Keep the nest at 24-28°C for optimal fungus and colony health. A heating cable placed on one side of the nest creates a temperature gradient allowing the ants to choose their preferred zone. They do not require hibernation or diapause, maintain tropical conditions throughout the year. Room temperature in most homes may be too cool, so monitor with a thermometer and adjust heating accordingly. Avoid temperature drops below 22°C, as this can harm the fungus garden.

Challenges and Common Problems

This species presents significant challenges for antkeepers. The primary difficulty is maintaining the fungal symbiosis, the colony depends entirely on their fungus garden, which can fail due to incorrect humidity, temperature, or parasite infection. Escovopsis fungal parasites are known to attack these ants' fungal cultivars ^[4], and wild-caught colonies may introduce these parasites. Additionally, this species is rarely available in the antkeeping hobby since only workers have been described and nothing is known about their queen biology or nuptial flights. Captive breeding has not been documented. Expect a steep learning curve and be prepared for the possibility of colony failure while learning their requirements.

Legal and Ethical Considerations

Mycetomoellerius atlanticus is native to Brazil and protected within that country's ecological framework. If you obtain a colony, ensure it was acquired legally and ethically. Never release this species or any non-native ant outside its natural range, as it could become invasive or disrupt local ecosystems. This species is not established in the antkeeping hobby, so prospective keepers should research thoroughly and only source from reputable breeders who can verify their stock was captive-bred.

Frequently Asked Questions

References