Cataglyphis tartessica

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to southwestern Spain, specifically the Guadalquivir River region in Andalusia. Found in habitats with sandy soils, mostly inland areas (parapatric with Cataglyphis floricola which occurs on the coast) ^[1][2].
• Colony Type: Monodomous (single nest per colony) and monogynous (single queen per colony). Colonies have an average of 183 workers, with high local nest density of about 6 nests per 10 square meters ^[1].
• Size & Growth:
  • Queen: ~5-6 mm total length (estimated from genus patterns, no specific total length measurement available for queens)
  • Worker: 4.51 ± 0.41 mm total body length ^[1]
  • Colony: Up to approximately 313 workers in largest colonies (mean 182.8 ± 130.6) ^[1]
  • Growth: Moderate, colonies reproduce by fission rather than producing winged reproductives
  • Development: Unknown, no specific development data available for this species (Development occurs during warm summer months when colonies are most active)
• Antkeeping:
  • Temperature: Keep at 24-30°C. This is a Mediterranean species adapted to warm conditions, related Cataglyphis species have optimal foraging temperatures around 54°C, though captive colonies should be kept cooler. Room temperature within this range works well, with a slight gradient if possible ^[4][5].
  • Humidity: Low to moderate. These are desert-adapted ants from dry sandy habitats. Keep the nest area relatively dry with some moisture available. Allow portions of the nest to dry out between rehydrating ^[1].
  • Diapause: Not typically required. As a Mediterranean species from southern Spain, they don't experience harsh winters. However, a slight cooling period (15-18°C) during winter months may benefit colonies, similar to their natural seasonal slowdown ^[6].
  • Nesting: Y-tong (AAC), plaster, soil nests, or 3D-printed nests work well. Provide sandy or loose substrate areas for natural digging behavior. They prefer dry to moderately humid conditions in the nest chamber ^[1].
• Behavior: C. tartessica is primarily a scavenger, foraging solitarily for arthropod prey and other food resources. They are opportunistic feeders, in some locations their diet consists largely of flower petals (Halimium halimifolium), while in others they scavenge mostly dead arthropods. Unlike most Cataglyphis species, they can perform rudimentary recruitment when finding large prey items, coordinating with nestmates to retrieve items too heavy for a single ant ^[1]. They are fast-moving and alert, typical of the genus. Escape prevention is important as they are active foragers. They do not sting but can spray formic acid as a defense mechanism when threatened ^[1].
• Common Issues: limited availability, this is a recently described species endemic to Spain with restricted range, fission reproduction means colonies naturally split, be prepared to manage colony divisions, warm temperature requirements must be met for colony health, small colony size may limit acceptance of various nest types, wild-caught colonies may be difficult to establish due to specific habitat requirements

Housing and Nest Setup

Cataglyphis tartessica adapts well to standard ant-keeping setups. Y-tong (AAC) nests work excellently, as do plaster nests with channels scaled to their medium size. The key is providing a dry to moderately humid nest chamber with access to a water reservoir. Because they come from sandy soil habitats in southwestern Spain, adding a section with loose sandy substrate allows them to exhibit natural digging behavior. The outworld should be simple with easy access to food. Use a test tube setup for founding colonies, transitioning to a proper nest once the colony reaches 30-50 workers. Escape prevention is important, while not the smallest ants, they are active and quick. Ensure connections between the nest and outworld are secure ^[1][2].

Feeding and Diet

C. tartessica is an opportunistic scavenger with a varied diet. In the wild, they primarily consume arthropod prey (dead insects, small invertebrates) but will also harvest plant resources like flower petals, in some areas up to 80% of their diet consists of Halimium halimifolium petals. In captivity, offer a varied diet: protein sources like small crickets, mealworms, and other insects should form the base. They will also accept sugar water or honey occasionally, though this varies by individual colony. Feed protein 2-3 times per week, removing uneaten prey after 24 hours. Unlike some specialized predators, they are generalist scavengers and accept most offered foods ^[1].

Temperature and Seasonal Care

As a Mediterranean species from southern Spain, C. tartessica requires warm conditions. Keep the nest at 24-30°C during the active season. In the wild, these ants are thermophilic foragers active during the hottest parts of the day, related Cataglyphis species forage at temperatures lethal to other ants (optimal around 54°C in the wild). However, captive colonies should be kept at moderate temperatures. A heating cable on one side of the nest creates a gradient allowing ants to choose their preferred temperature. During winter, a slight reduction to 18-22°C is acceptable, but full hibernation is not necessary for this Mediterranean species ^[4][5].

Colony Reproduction and Fission

This is one of the most fascinating aspects of C. tartessica. Unlike most ants that produce winged reproductives for nuptial flights, this species reproduces through colony fission. Around the summer solstice, a mature colony splits, about one-third of workers and cocoons are transported by special 'transporter' ants to a new nest location approximately 8 meters away. The new queen (gyne) is transported while still in her cocoon, and the original queen remains in the mother nest. This means colonies do not produce winged queens that fly away, instead, new colonies form through this walking dispersal. If you keep a mature colony, expect this fission behavior and be prepared to separate nests if needed ^[1][3][8].

Queen Morphs and Colony Structure

C. tartessica has two distinct queen morphs that make colony identification interesting. Brachypterous queens have short, underdeveloped wings and are larger. Ergatoid queens are completely wingless and look almost identical to workers, only distinguishable by their slightly larger size and physogastric (distended) abdomen when reproductive. Both types can coexist in a colony, though only one typically becomes the primary egg-layer. The brachypterous queens have greater reproductive potential. Workers actively regulate queen numbers, supernumerary gynes are eliminated through worker aggression. This complex system means founding colonies may have either queen type, and both can successfully establish colonies through dependent colony founding ^[1][9].

Frequently Asked Questions

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References