Tetramorium brevicorne

Tetramorium brevicorne

Tetramorium brevicorne is a small, dark ant species endemic to the islands of Sardinia and Corsica in the western Mediterranean ^[1]. Workers are typically 3-4mm with a characteristic short, compact build that gives the species its name ('brevicorne' means 'short-horned'). They have the typical Tetramorium appearance: a rounded head, well-developed propodeal spines, and a two-segmented petiole. The species was originally described as a variety of the common pavement ant (Tetramorium caespitum) but was raised to full species status in 1964 ^[2]. This ant inhabits rocky Mediterranean landscapes, typically nesting in soil under stones in warm, sun-exposed areas typical of the islands where it is found.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Sardo-Corsican endemic, found only on the islands of Sardinia and Corsica in the western Mediterranean, with unconfirmed reports from Sicily and Turkey ^[1][3]. Inhabits warm, rocky Mediterranean terrain, typically nesting under stones in sunny locations.
• Colony Type: Single-queen colonies (monogyne) based on typical Tetramorium genus patterns. Colony size is unknown for this specific species but likely reaches several hundred workers based on related Tetramorium species.
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Estimated 6-8mm based on genus-level data for Tetramorium queens
  • Worker: Estimated 3-4mm based on genus-level data for Tetramorium workers
  • Colony: Estimated several hundred workers based on typical Tetramorium colony sizes
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal temperature based on typical Tetramorium development (Development time is inferred from related Tetramorium species, specific data for T. brevicorne is not available)
• Antkeeping:
  • Temperature: Keep at 22-26°C, these are Mediterranean ants that prefer warm conditions. A heating cable on one side of the nest creates a temperature gradient that allows the colony to regulate its own conditions.
  • Humidity: Moderate humidity around 50-60%. These ants prefer drier conditions than many Myrmicinae, keep the nest substrate slightly moist but allow it to dry between waterings. Provide a moisture gradient so ants can choose their preferred spot.
  • Diapause: Yes, as a Mediterranean species, they likely require a mild winter rest period of 8-12 weeks at 10-15°C. This simulates their natural seasonal cycle on Sardinia and Corsica where winters are mild but temperatures still drop significantly.
  • Nesting: Y-tong (AAC) nests work well for this species. They also do well in test tube setups and naturalistic setups with stones. Provide a shallow depth substrate as they are small ants that prefer tight chambers.
• Behavior: Typical Tetramorium behavior, workers are active foragers that search for food both on the ground and up plant stems. They are not particularly aggressive but will defend their nest vigorously if threatened. Workers are small but determined, and they can sting (Myrmicinae have functional stingers). Escape prevention should be good due to their small size, use fine mesh on any openings.
• Common Issues: limited data means care requirements are estimates from genus-level information, adjust based on colony behavior, small size makes escape prevention important, use tight-fitting lids and fine mesh barriers, Mediterranean origin means they need warmth, cold rooms may slow or stop colony development, overheating is a risk, direct sunlight on nests can kill colonies, wild-caught colonies from this species are extremely rare since they are endemic to just two islands

Housing and Nest Setup

Tetramorium brevicorne is a small ant that does well in several nest types. Y-tong (AAC) nests are excellent because they provide the dark, tight chambers these ants prefer. Test tube setups also work well for founding colonies and work perfectly for keeping small colonies. If using a naturalistic setup, provide flat stones on top of soil substrate, this mimics their natural nesting under stones in the Mediterranean. The nest chamber should be relatively small and tight-fitting, these ants feel secure in compact spaces. Always ensure excellent escape prevention as their small size allows them to squeeze through tiny gaps. Apply Fluon or similar barrier to the edges of any formicarium.

Feeding and Diet

Like most Tetramorium species, T. brevicorne is a generalist feeder. Offer protein sources such as small insects (fruit flies, small crickets, mealworms) and other small arthropods. They also accept sugar sources, a drop of sugar water or honey water should be taken by workers. In the wild, they likely forage for small insects and tend aphids for honeydew. Feed every 2-3 days for established colonies, removing any uneaten prey after 24 hours. Fresh sugar water should be available at all times, replace every few days to prevent mold.

Temperature and Seasonal Care

As a Mediterranean species from Sardinia and Corsica, these ants need warmth to thrive. Keep the nest area at 22-26°C for optimal brood development. A heating cable placed on one side of the nest creates a gradient that allows workers to move between warmer and cooler areas. During winter, provide a mild diapause at 10-15°C for 8-12 weeks, this mimics their natural seasonal cycle. The islands they inhabit have mild winters where temperatures drop but rarely freeze. Do not expose the nest to direct sunlight as overheating can quickly kill colonies. Room temperature is acceptable if your home stays in the low-to-mid 20s Celsius year-round. ^[1]

Humidity and Water

These ants prefer moderate, drier conditions compared to many ant species. Keep the nest substrate slightly moist but allow it to partially dry between waterings. A humidity range of 50-60% is appropriate. Provide a water tube or cotton ball with fresh water at all times for drinking. For nesting material, slightly damp soil or sand works well, avoid waterlogged conditions which can kill small colonies. If using a test tube setup, keep the water reservoir moderate in size to prevent flooding.

Colony Founding

Queens are claustral, they seal themselves in a small chamber and raise the first brood alone without foraging. The queen uses stored fat reserves to survive until her first workers (nanitics) emerge. This typically takes 6-8 weeks under warm conditions. After the first workers emerge, the colony expands slowly at first. Founding colonies should be kept in a quiet, dark location with minimal disturbance. Do not feed during the founding stage, the queen and her brood do not need food until workers emerge. Once workers are active, you can begin offering small amounts of sugar water.

Behavior and Temperament

Workers are active foragers that search for food energetically. They are not particularly aggressive toward humans but will defend their nest if threatened. As Myrmicinae, they have a functional stinger and can deliver a mild sting if handled roughly. Workers can climb smooth surfaces but are not particularly strong escape artists compared to some other small ants. However, due to their tiny size, always use excellent escape prevention with tight-fitting lids and fine mesh. Colonies are moderately active and workers can often be seen foraging during the day.

Frequently Asked Questions

References