Crematogaster jacindae

Crematogaster jacindae

Crematogaster jacindae is a tiny, recently described ant species endemic to the Dhofar Governorate in Oman. Workers measure just 0.72-1.0mm in head length, making them one of the smaller Crematogaster species. The species is instantly recognizable by its striking bicolored pattern: the head is black-brown to black, the mesosoma and waist segments are dark brown, and the gaster (abdomen) is a brilliant golden yellow that strongly contrasts with the rest of the body. Unlike many Crematogaster species, this ant completely lacks propodeal spines, instead having distinctive slit-shaped propodeal spiracles ^[1][2].

This species was only described in 2019 and is named after New Zealand's former Prime Minister Jacinda Ardern. Workers forage actively on vegetation, particularly acacia trees, as well as on the ground and wild shrubs. They nest in leaf litter, soil, and under stones in the hot, dry Dhofar region ^[1][2]. As a newly described species with a very limited range, there is much still to learn about its captive care requirements.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Dhofar Governorate, Oman. Found in hot, arid regions with microhabitats including leaf litter, soil, under stones, and on native vegetation especially acacia trees ^[1][2].
• Colony Type: Colony structure is unconfirmed. Based on typical Crematogaster patterns, likely single-queen (monogyne) colonies with claustral founding.
• Size & Growth:
  • Queen: Unknown, not yet described in scientific literature
  • Worker: 0.72-1.0mm head length (very small ants) ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data available
  • Development: Unknown, no direct development data. Based on typical Crematogaster patterns and small size, estimate 6-10 weeks at optimal temperature. (Development timeline is unconfirmed. Related Crematogaster species typically develop in 6-8 weeks at warm temperatures.)
• Antkeeping:
  • Temperature: Inferred: Dhofar is a hot region with summer temperatures exceeding 40°C. Keep nest area around 24-30°C with a slight gradient. Room temperature (22-26°C) is likely suitable as a starting point.
  • Humidity: Inferred: Dhofar has a hot, dry climate with low humidity. Keep nest substrate moderately dry with some moisture available. Avoid overly damp conditions.
  • Diapause: Unknown, no specific data. Dhofar has mild winters, so a reduced activity period may occur but full hibernation is unlikely.
  • Nesting: Inferred: In nature they nest in leaf litter, soil, and under stones. A Y-tong (AAC) or plaster nest with moderate humidity works well. Their small size requires tight-fitting connections and small chambers.
• Behavior: Workers are active foragers collected from vegetation using beating sheets, suggesting they are arboreal and frequently climb. They likely have the typical Crematogaster defensive behavior, they can sting and may raise their gaster in an aggressive display when threatened. Their very small size means escape prevention must be excellent. They probably tend honeydew-producing insects and are omnivorous.
• Common Issues: very small size means escapes are likely without fine mesh barriers and tight-fitting connections, newly described species with limited captive care data, expect some trial and error, wild-caught colonies may have parasites or diseases from their native range, slow colony growth can lead to beginner impatience and overfeeding, high temperatures needed but must avoid drying out the nest completely

Appearance and Identification

Crematogaster jacindae is a striking little ant that stands out from other Crematogaster species. Workers measure just 0.72-1.0mm in head length, making them quite small. The most distinctive feature is their bicolored pattern: the head is black-brown to black, the mesosoma (middle body section), petiole, and postpetiole are dark brown, but the gaster (abdomen) is a brilliant golden yellow that really pops against the darker body parts ^[1].

Unlike many Crematogaster species that have propodeal spines, this species completely lacks them, the propodeal spiracles are distinctive slit-shaped openings instead ^[1]. The area in front of the eyes has fine longitudinal striations, and the eyes themselves are relatively small with about 11 ommatidia in the longest row. These features make it easy to distinguish from related species, including its closest relative Crematogaster inermis from Egypt ^[1].

Natural History and Distribution

This species is endemic to the Dhofar Governorate in southern Oman, meaning it's found nowhere else on Earth ^[2]. Dhofar is a mountainous region with a hot, arid climate, though the mountains can trap moisture and create slightly more humid conditions in some areas.

Workers have been collected from various microhabitats including leaf litter, soil, under stones, and on native vegetation, particularly acacia trees (Vachellia species) ^[1][2]. Most specimens were collected by beating vegetation, a method where you hold a sheet under branches and shake them to dislodge insects. Workers were also observed foraging on the ground and on wild shrubs ^[2].

This foraging behavior suggests they are active climbers and likely nest in elevated locations as well as on the ground. In captivity, they will probably appreciate opportunities to climb and explore vertical spaces.

Housing and Nest Setup

Because of their very small size, housing Crematogaster jacindae requires attention to escape prevention. Use test tubes for founding colonies, with cotton or plaster as the water reservoir. For established colonies, Y-tong (acrylic) nests or plaster nests work well, the small chambers and passages should be scaled to their tiny size.

Their natural nesting preferences suggest they can handle moderately dry conditions, so avoid overly damp setups. A small outworld (foraging area) connected to the nest works well since they are active foragers. Ensure all connections are tight-fitting, these tiny ants can squeeze through gaps that seem impossibly small.

Room temperature is likely suitable as a starting point (22-26°C), but you may want to provide a slight warmth gradient using a heating cable on part of the nest. Dhofar gets very hot in summer, so they can likely tolerate warmer temperatures than typical temperate species.

Feeding and Diet

Based on typical Crematogaster behavior, this species is omnivorous. They likely tend honeydew-producing insects (aphids, scale insects) on their host plants in the wild, so sugar sources are important. In captivity, offer sugar water, honey, or diluted honey water regularly.

For protein, they probably accept small insects. Given their tiny size, offer appropriately sized prey like fruit flies, small ants (not their own species), or tiny pieces of mealworms. Live prey is likely preferred, but they may accept pre-killed items.

Feed small amounts initially and observe what they accept. Remove uneaten prey after 24-48 hours to prevent mold. A constant sugar source plus protein 2-3 times per week is a good starting point.

Temperature and Seasonal Care

Crematogaster jacindae comes from the hot Dhofar region of Oman, where summer temperatures regularly exceed 40°C. This suggests they prefer warm conditions and can likely tolerate temperatures that would kill many temperate ant species.

Aim for nest temperatures around 24-30°C. A heating cable on one side of the nest creates a gradient so workers can choose their preferred temperature. Room temperature (around 22-26°C) is likely acceptable as a baseline.

Regarding winter care, Dhofar has mild winters compared to temperate regions, so they probably don't need a true hibernation. However, they may reduce activity during cooler months. If your room temperature drops significantly in winter, a slight cool period (15-20°C) for 2-3 months may be appropriate, but monitor colony activity.

Behavior and Temperament

Crematogaster ants are known for their defensive behavior, when threatened, workers raise their gasters (abdomen) and can deliver a sting. Despite their small size, they can sting and the sting can be painful for such a tiny ant. They are also known for their characteristic habit of running with their gaster held high.

These ants are active foragers and will explore their outworld thoroughly. They likely recruit nestmates to food sources through chemical trails, typical of the genus. Their small size makes them quick movers, and they can be quite energetic.

Because they are so small, escape prevention is critical. Even tiny gaps in tubing or around nest connections can allow escape. Use fluon on test tube rims and check all connections regularly.

Frequently Asked Questions

References