Sericomyrmex maravalhas

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Central Brazil (Mato Grosso), specifically the Serra Azul State Park near Barra do Garças. They live in cerradão (wooded savanna) and riparian forest, nesting in rotting wood at elevations around 532-539 m ^[1][3].
• Colony Type: Unconfirmed, likely single-queen (monogyne) based on typical Sericomyrmex patterns.
• Size & Growth:
  • Queen: ~5-6 mm (inferred from related Sericomyrmex species) ^[1]
  • Worker: ~3-4 mm (inferred from related Sericomyrmex species) ^[1]
  • Colony: Unknown, no colony size data available for this recently described species
  • Growth: Moderate, inferred from related fungus-farming ants
  • Development: Unknown, not studied, estimated 6-8 weeks at 26°C based on typical Attini development (unconfirmed) (Development time is estimated from related fungus-farming ants, not directly studied for Sericomyrmex maravalhas)
• Antkeeping:
  • Temperature: Keep around 24-28°C year-round, mimicking warm tropical conditions. Use a gentle gradient so ants can regulate ^[3].
  • Humidity: Maintain a moisture gradient, keep the nest substrate damp but not waterlogged. Provide good ventilation to prevent mold while supporting the fungal garden ^[1].
  • Diapause: No, these are tropical ants that do not require hibernation. Keep them warm year-round ^[3].
  • Nesting: They nest in rotting wood in nature. In captivity, use plaster or Y-tong nests with small chambers scaled to their size. Avoid acrylic nests. Include a moisture reservoir but ensure the nest doesn't flood ^[1].
• Behavior: Peaceful and non-aggressive, typical of fungus-farming Attini. They cultivate a fungal garden for food. Workers are tiny, high escape risk, use fine mesh and barriers. They have a functional stinger but it is not medically significant (based on subfamily Myrmicinae).
• Common Issues: tiny size makes escape likely without fine mesh barriers and fluon, maintaining the fungal garden is critical, they cannot survive without their specific fungal symbiont, high humidity needs can cause mold if ventilation is poor, balance moisture with airflow, newly described species, captive husbandry is not well-established, be prepared to experiment and learn

Housing and Nest Setup

Because Sericomyrmex maravalhas is tiny, your nest chambers must be small and scaled. They naturally nest in rotting wood in the Brazilian cerradão, so a plaster or Y-tong formicarium with moisture chambers works well ^[1][3]. The key is maintaining stable humidity, these fungus farmers need consistent moisture for their fungal garden. Use a damp substrate (plaster or soil) and include a water reservoir. Avoid acrylic nests. Because workers are so small, use fine mesh on all openings and apply fluon or similar barriers to prevent escapes.

Feeding and the Fungus Garden

As an attine ant, Sericomyrmex maravalhas cultivates fungus for food, they are fungus farmers like leafcutter ants, but on a much smaller scale. In captivity, you cannot easily maintain their native fungal symbiont, so this species is challenging to keep long-term. The colony needs organic material to feed their fungus, typically small pieces of leaves, flower petals, or other plant matter. The ants cut these into tiny pieces to cultivate their garden. This is NOT a species for beginners because maintaining a healthy fungus garden requires specific conditions and knowledge. If you cannot source the proper fungal symbiont, this species may not be suitable for captive husbandry ^[1].

Temperature and Climate Control

These are tropical ants from central Brazil, so they need warm conditions year-round. Keep the nest area at 24-28°C, this mimics their natural environment in the cerrado of Mato Grosso ^[3]. A heating cable on one side of the nest can create a temperature gradient. Do not let temperatures drop below 20°C for extended periods. Unlike temperate species, they do not enter diapause. Stable warmth is essential for colony health ^[3].

Behavior and Colony Dynamics

Sericomyrmex maravalhas is a peaceful species typical of the Attini tribe. Workers are tiny (about 3-4 mm total length) and focus on cultivating their fungus rather than defending aggressively ^[1]. The colony establishes a fungal garden in their nest chambers, and workers forage for plant material to feed it. Because they are small, they can slip through standard barriers, use fine mesh and escape prevention. The species was only described in 2017,so specific behaviors in captivity are poorly known. Expect slow, deliberate movements and non-aggressive interactions ^[1].

Origin and Natural History

This species is endemic to central Brazil (Mato Grosso), collected from Serra Azul State Park near Barra do Garças at ~539 m elevation ^[1]. Their habitat is cerradão (wooded savanna) and riparian forest, they are a cerrado specialist, found more often in forested areas than open savanna ^[3]. They nest in rotting wood. The species is named after myrmecologist Jonas Maravalhas, 'maravalhas' echoes the Portuguese word for 'wonders' ^[1].

Taxonomy and Genetics

Sericomyrmex maravalhas belongs to the scrobifer clade ^[4]. Cytogenetic studies show a diploid chromosome number of 2n = 48 with a karyotype formula of 28 metacentric + 20 submetacentric chromosomes ^[5]. Heterochromatin is present in centromeric and pericentromeric regions, and 18S rDNA clusters are located in a terminal position on the short arm of the 7th metacentric pair ^[5].

Frequently Asked Questions

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References