Cataulacus regularis

Cataulacus regularis

Cataulacus regularis is a medium-sized arboreal ant endemic to Madagascar. Workers measure 5.3-5.9mm and have a distinctive appearance with strongly sculptured bodies featuring parallel longitudinal grooves that give the cuticle a ploughed or ridged look . The species lacks spines on the alitrunk but has short propodeal spines and a petiole with small lateral teeth. They are found in various forest habitats across Madagascar, including montane forest at elevations around 875m ^[1]. This species belongs to the Cataulacus huberi group and is closely related to Cataulacus porcatus, though that species is smaller and has erect hairs on the alitrunk .

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Madagascar, found in various forest habitats across the island, including montane forest in the Réserve Spéciale d'Anjanaharibe-Sud at 875m elevation ^[1]. Type locality is Anosibé in the Bezanozano Province ^[2].
• Colony Type: Colony structure is unconfirmed. Based on genus patterns, likely single-queen colonies, but this has not been directly studied.
• Size & Growth:
  • Queen: Undescribed, queen size not documented in available literature
  • Worker: 5.3-5.9mm total length, with head width 1.30-1.32mm
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, growth rate has not been documented
  • Development: Unconfirmed, no direct development data available. Based on typical Myrmicinae patterns in tropical arboreal species, estimate 6-10 weeks at optimal temperature. (Development timeline is unconfirmed. Related Cataulacus species typically take 6-8 weeks from egg to worker in warm conditions.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. Madagascar is tropical, so they prefer warm conditions. A gentle gradient allowing them to choose warmer or cooler areas is ideal.
  • Humidity: Moderate to high humidity, forest dwellers need moisture but not saturation. Keep nest substrate slightly moist, with some drier areas available.
  • Diapause: No, as a tropical species from Madagascar, they do not require hibernation or winter rest. Maintain consistent temperatures year-round.
  • Nesting: Arboreal nesters in the wild, they likely nest in hollow twigs, branches, or tree cavities. In captivity, a Y-tong (AAC) nest or plaster formicarium with narrow chambers works well. Provide climbing structures and branches since they are tree-dwelling ants.
• Behavior: Generally calm and non-aggressive. As arboreal ants, they are good climbers and will traverse branches and vertical surfaces. They have moderate escape risk due to their size, standard barriers work well but ensure enclosures are secure. They are likely diurnal and forage actively in the canopy layer.
• Common Issues: limited availability, this species is rarely available in the antkeeping hobby due to its restricted Madagascar distribution, escape prevention, arboreal ants are excellent climbers and may escape through small gaps if not properly secured, humidity control, forest species need careful moisture balance, too wet causes mold, too dry causes desiccation, lack of documented care information, limited species-specific data means keepers may need to adapt based on related species

Natural History and Distribution

Cataulacus regularis is endemic to Madagascar, where it inhabits various forest types across the island. The species has been documented at elevations around 875m in the Réserve Spéciale d'Anjanaharibe-Sud, indicating it can survive in montane forest environments ^[1]. The type locality is Anosibé in the Bezanozano Province, located approximately three days' travel east-southeast of Antananarivo ^[2]. As a member of the Cataulacus huberi group, this species is characterized by its distinctive sculpturation, parallel longitudinal sulci that create a ploughed appearance on the dorsal surfaces of the head, alitrunk, petiole, and postpetiole . This unusual sculpturing is only found in one other Madagascan species, the closely related Cataulacus porcatus, which is smaller and has erect hairs on the dorsal alitrunk .

Housing and Nest Preferences

Cataulacus regularis is an arboreal species, meaning in the wild they nest in elevated locations such as hollow twigs, branches, and tree cavities. In captivity, you should replicate this by providing vertical climbing structures and elevated nesting options. A Y-tong (AAC) nest works well for this species, or you can use a plaster formicarium with narrow chambers scaled to their 5-6mm worker size. Include small branches, twigs, or artificial vines for climbing, these ants are natural canopy dwellers and will use vertical space actively. Ensure the nest has some chambers that stay slightly moist while providing drier areas so the ants can self-regulate their humidity preferences.

Temperature and Climate Requirements

As a tropical species from Madagascar, Cataulacus regularis prefers warm conditions. Maintain temperatures in the range of 22-26°C, which mimics the stable warmth of their native forest habitat. Unlike temperate species, they do not require any diapause or winter cooling period, maintaining consistent temperatures year-round is important. You can create a gentle temperature gradient within the setup by placing a heating cable on one side of the nest, allowing workers to move between warmer and cooler areas as they choose. Avoid temperatures below 20°C or above 30°C for extended periods. Room temperature within this range is typically suitable without additional heating in most homes.

Feeding and Diet

Based on genus patterns for Cataulacus species, these ants are likely omnivorous, feeding on honeydew, small insects, and nectar in the wild. In captivity, offer a varied diet including sugar water or honey as an energy source, and protein-rich foods such as small crickets, mealworms, or other small insects. Feed protein prey items 2-3 times per week, and keep a constant supply of sugar water available. Remove any uneaten prey after 24-48 hours to prevent mold issues. Since this is an arboreal species, they may prefer feeding at elevated locations rather than on the ground, consider offering food on small platforms or leaves positioned above the nest floor.

Colony Development and Growth

The colony development timeline for Cataulacus regularis has not been directly documented in scientific literature. Based on typical patterns for Myrmicinae ants in tropical conditions, you can expect approximately 6-10 weeks from egg to first worker at optimal temperatures. Queens are undescribed in the literature, so exact founding behavior is unknown. However, most Cataulacus species are thought to be claustral, where the queen seals herself in a chamber and lives off stored fat reserves until the first workers emerge. Colony growth is likely moderate, these are not fast-growing species like some tropical fire ants, but neither are they particularly slow. Patience is key, as it may take several months to see significant colony growth after founding.

Handling and Temperament

Cataulacus regularis workers are relatively calm and not particularly aggressive. They possess a stinger but are not known for aggressive defensive behavior. Their moderate size (5-6mm) makes them easier to handle than tiny ants, but they are still small enough that careful handling is important. When observing or maintaining the colony, move slowly and avoid sudden vibrations or disturbances. These ants are good climbers and may attempt to explore outside the nest area, always use secure barriers and check that lids fit tightly. They are diurnal and will be most active during daylight hours, which makes them enjoyable to observe.

Frequently Asked Questions

References