Mycetophylax morschi

Mycetophylax morschi

Mycetophylax morschi is a small fungus-farming ant native to the Atlantic coast of South America, ranging from Argentina to Brazil. Workers measure 2.5-3mm and are brown to light brown in color, with distinctive features including a scrobe-like depression on the head that shelters the antennal scapes and mandibles with nine triangular teeth ^[1][2]. This species belongs to the 'lower agriculture' group of attine ants, meaning they cultivate a single fungal species (Leucocoprinus sp.) in small underground gardens rather than the complex leaf-cutter agriculture of higher attines ^[3][4]. Unlike many ant species, M. morschi lives in small colonies of typically 120 workers, nesting exclusively in the sandy soils of coastal dunes and restinga habitats ^[5]. The species is notable for its monandrous mating system, queens mate only once and store sperm for life, which is relatively rare among ants ^[1][6].

Quick Summary

• Difficulty: Hard
• Origin & Habitat: Atlantic coast of South America (Argentina, Brazil, French Guiana). Nests in sandy soil of coastal dunes and restinga habitats, preferring areas with denser vegetation cover away from the ocean ^[2][5].
• Colony Type: Mostly monogyne (single queen) with occasional polygyny (2 queens in some colonies). Average colony size is around 120 workers (range 38-252) ^[1][5].
  • Colony: Monogyne, Polygyne
• Size & Growth:
  • Queen: 3.45-3.90 mm ^[1]
  • Worker: 2.54-3.03 mm ^[1][2]
  • Colony: Up to ~250 workers (average 120) ^[2][5]
  • Growth: Slow
  • Development: Unknown, no direct development data available for this species (Development timeline has not been studied. Based on related lower Attini species and small colony size, expect development to take several months. This is a slow-growing species.)
• Antkeeping:
  • Temperature: Keep at room temperature (20-25°C). Workers reduce activity during extreme heat above 40°C ^[7]. They are adapted to coastal subtropical conditions.
  • Humidity: Requires sandy, well-draining substrate. Nests are found in dunes and restinga areas which are drier than rainforest habitats. Keep substrate moderately moist but not waterlogged.
  • Diapause: Unknown, no documented hibernation requirement. Native range has mild winters, so dormancy is likely not required.
  • Nesting: Natural nests are in sandy soil,7-40cm deep with 1-2 fungus chambers. In captivity, use a naturalistic setup with deep sand substrate (at least 15cm) or a plaster/acrylic nest with sandy areas. The nest should allow for fungus garden chamber space.
• Behavior: Workers are small (~2.5mm) and not aggressive. They forage in small groups up to 10 workers, collecting plant material and arthropod feces for their fungus garden ^[8]. They are not known to sting and pose no danger to keepers. Escape risk is moderate due to small size, standard barrier methods work well. Colonies are active throughout the day without marked peaks, with activity positively affected by temperature and negatively by humidity ^[8]. Laboratory colonies have historically struggled to adapt to captive conditions ^[1].
• Common Issues: colonies do not adapt well to laboratory conditions, workers often refuse offered substrate and fungus growth is insufficient ^[1], the symbiotic fungus is vulnerable to Escovopsis parasite, maintaining healthy fungus garden is critical ^[3], slow growth and small colony size means colonies develop slowly ^[5], requires specific plant material for fungus cultivation, may not accept standard ant foods ^[1], nests in deep sandy soil requiring appropriate enclosure setup

Fungus Farming Requirements

Mycetophylax morschi is a lower attine ant that cultivates Leucocoprinus sp. fungi for food ^[3]. Unlike leaf-cutter ants that cut fresh leaves, these ants collect plant material, dead arthropods, and arthropod feces to feed their fungus garden ^[8][9]. In the wild, workers forage in small groups and collect substrates including arthropod feces (35%), vegetable material (34%), flower parts (22%), and leaf pieces ^[8]. This is the most challenging aspect of keeping this species, the fungus requires specific plant material to grow, and colonies in laboratory settings have historically failed to thrive because they either refused offered substrates or the fungus growth was insufficient ^[1]. You will need to provide a variety of plant-based materials and be prepared for experimentation to find what your colony accepts. The fungus garden is essential, without it, the colony cannot survive.

Nesting and Housing

In the wild, M. morschi nests exclusively in sandy soil of coastal dunes and restinga areas. Nests consist of a small entrance (about 0.5cm) surrounded by a circular or semi-circular sand crater, with tunnels leading to 1-2 fungus chambers located 20-40cm underground ^[5]. The tunnels are narrow, only about 3mm in diameter. For captivity, you need a deep naturalistic setup with at least 15-20cm of sandy substrate, or a hybrid setup with a formicarium connected to an outworld. The nest chambers should be dark and humid enough to support fungus growth. These ants prefer areas with vegetation cover in the wild, so some planted areas in the enclosure may help them feel secure. The species is not aggressive and does not require special escape prevention beyond standard measures.

Feeding and Diet

This is a fungus-farming ant, workers do not eat protein or sugar directly. Instead, they collect substrate for their fungal garden, which they then eat. Provide small amounts of: finely chopped plant material, dried leaves, flower petals, and importantly, arthropod feces (this makes up 35% of their natural foraging collection) ^[8]. Some keepers report success with very small amounts of dead insects, but plant material is the primary substrate. Sugar water is generally NOT accepted, these ants are not attracted to sweets. The key challenge is that the fungus must thrive for the colony to survive. If the fungus declines, the colony will decline. This makes M. morschi one of the most difficult ant species to keep successfully, suitable only for experienced antkeepers.

Temperature and Seasonal Care

Keep the nest area at room temperature, roughly 20-25°C. This species is found along the subtropical Atlantic coast where temperatures are mild year-round. Workers reduce foraging activity during extreme heat above 40°C ^[7], so avoid placing the colony in direct hot sunlight or near heat sources. Humidity needs are moderate, the sandy dune habitat is drier than rainforest. Keep the substrate moderately moist but ensure good drainage to prevent waterlogging. Whether diapause is required is unknown, the mild climate of their native range suggests a winter rest may not be necessary, but cool temperatures (15-20°C) during winter months may help simulate natural seasonal cycles.

Colony Structure and Reproduction

M. morschi colonies are typically small, with an average of about 120 workers (range 38-252) ^[5]. Most colonies are monogyne (single queen), but polygynous colonies with 2 queens have been observed ^[1]. The mating system is monandrous, queens mate only once and store all sperm for their lifetime ^[1][6]. This is unusual among ants and affects how you should approach colony founding. Males are produced seasonally and colonies can have 0-29 males and 0-12 gynes (young queens) ^[5]. Nuptial flight timing is not documented, but based on related species, it likely occurs during warm summer months.

Unique Challenges - The Fungus Garden

The defining feature of M. morschi, and its biggest challenge, is the symbiotic fungus garden. This species cultivates Leucocoprinus sp. fungi, which provides their sole food source ^[3]. The fungus is vulnerable to a specialized parasite called Escovopsis kreiselii, which has been isolated from M. morschi colonies in the wild ^[3][10]. In healthy colonies, the fungus fills about two-thirds of the chamber volume ^[5]. The ants carefully tend the garden, adding substrate and removing waste. In captivity, maintaining a healthy fungus is the make-or-break factor for colony success. Laboratory colonies have historically failed because the fungus either wouldn't grow or was overtaken by parasites ^[1]. This is not a species for beginners.

Frequently Asked Questions

References