Myrmecina melonii

Myrmecina melonii

Myrmecina melonii is a tiny, rusty-red ant endemic to southern Sardinia, Italy. Workers measure just 2.9-3.5mm with a distinctive appearance featuring longitudinal rugulae (wrinkles) on the head and short propodeal spines. The body is bright ferrugineous (rusty orange-red) with the posterior half of the head darker and the first gaster segment brown with a reddish tint. This species belongs to the Myrmicinae subfamily and is closely related to Myrmecina sicula and Myrmecina atlantis, sharing similar reddish coloration and scape shape but differing in sculpture details. What makes M. melonii particularly special is its extremely limited range, it is known only from a handful of localities in southern Sardinia, making it one of the rarest European ants and a true Sardinian endemic ^[1][2].

Quick Summary

• Difficulty: Unknown, no captive husbandry data available
• Origin & Habitat: Sardinia, Italy, found under stones in Mediterranean scrub (oleo-ceratonion plant association) at 60-200m elevation ^[3]
• Colony Type: Unconfirmed, colony structure has not been documented in scientific literature
• Size & Growth:
  • Queen: Unknown, queen morphology not described ^[3]
  • Worker: 2.9-3.5mm ^[3]
  • Colony: Unknown, no colony size data available ^[3]
  • Growth: Unknown
  • Development: Unknown, estimate based on related Myrmecina species: 6-10 weeks (No direct development data exists for this species. Related Myrmecina species typically develop in 6-10 weeks at optimal temperatures.)
• Antkeeping:
  • Temperature: Inferred from Mediterranean habitat: aim for 22-26°C with some variation. Provide a gentle temperature gradient allowing ants to self-regulate. Avoid temperatures below 15°C or above 30°C.
  • Humidity: Moderate humidity preferred, typical of Mediterranean scrub habitats. Keep nest substrate lightly moist but not waterlogged. Allow some drying between waterings.
  • Diapause: Likely, exhibits underground aestivation (summer dormancy) based on collection data showing they move deeper into soil during warm months ^[4]. Winter diapause is probable given Sardinian climate.
  • Nesting: Natural nesting is under stones in dry to moderately damp soil. In captivity, a small test tube setup or Y-tong nest with tight chambers scaled to their tiny 3mm size works well. Provide moderate substrate depth.
• Behavior: This is a very small, cryptic ant that nests under stones. Workers are slow-moving and not particularly aggressive. They are likely nocturnal or crepuscular foragers based on their small eye size (about 12 ommatidia). Escape prevention is critical due to their tiny 3mm size, they can squeeze through standard test tube barriers. Use fine mesh and tight-fitting lids. No documented sting.
• Common Issues: no captive husbandry data exists, all care recommendations are speculative, extremely rare in the hobby with no established keeping protocols, tiny size makes escape prevention challenging, endemic status means wild collection is both difficult and ethically questionable, slow growth typical of small Myrmicinae may frustrate beginners

Species Discovery and Taxonomy

Myrmecina melonii was first described in 1999 by Francesco Rigato from specimens collected in southern Sardinia. The type locality is Perdas de Fogu on the island of Sant'Antioco off the coast of Sardinia, with paratypes collected from nearby Santadi. The species name 'melonii' honors C. Meloni, who collected the specimens. This ant is part of a species complex that includes Myrmecina sicula and Myrmecina atlantis, all sharing similar reddish coloration and scape morphology. The species can be distinguished from its relatives by its sculpture of longitudinal rugulae that are weakly developed on the alitrunk (middle body section) and by its short propodeal spines ^[3][4].

Distribution and Endemism

This species is a true Sardinian endemic, known only from a handful of localities in southern Sardinia. It is one of only two elements of the Sardinian ant fauna that testify to ancient colonization of the Southern-Tyrrenian region. The distribution is extremely narrow and geographically very close to M. atlantis and M. sicula, which are found on other Mediterranean islands. Unlike those species, M. melonii is allopatric (geographically separated) from its relatives, separated only by sea. However, it is sympatric with Myrmecina graminicola, meaning they occur in the same areas. This limited distribution makes any wild collection ethically problematic and contributes to the species' conservation concern ^[1][4][2].

Natural History and Behavior

In the wild, Myrmecina melonii nests under stones in Mediterranean scrubland, specifically the oleo-ceratonion plant association typical of dry Mediterranean landscapes. Collection data suggests this species exhibits underground aestivation, they move deeper into the ground during the warmer summer months when they have been searched for but never collected. This behavior explains why they are rarely found during summer. The ants are typically active during cooler periods, likely in spring and autumn, and likely become dormant during both summer heat and winter cold. Workers are small and slow-moving, foraging primarily at night or during twilight based on their reduced eye size ^[3][4].

Keeping Considerations

Because this species has never been documented in the ant-keeping hobby, all care recommendations are speculative estimates based on related species and natural habitat data. Start with a small test tube setup with tight-fitting barriers since workers are only 3mm. Temperature should be in the low-to-mid 20s°C range, mimicking Mediterranean conditions. Humidity should be moderate, damp but not wet substrate. Given their tiny size and cryptic nature, they likely prefer quiet, dark locations and should not be disturbed frequently. Do not expect rapid colony growth. If you obtain a colony, document your observations carefully as this species represents an opportunity to contribute new knowledge to ant-keeping ^[3].

Frequently Asked Questions

References