Vombisidris satunensis

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Thailand (Satun Province and Nakhon Nayok Province). Nests in dead twigs hanging on shrub trees at forest edges, in lowland habitats at ca. 100-200 m elevation ^[1][2].
• Colony Type: Colony structure is unconfirmed, the research does not document whether colonies are single-queen or multi-queen ^[1][2].
• Size & Growth:
  • Queen: 2.90-3.30 mm ^[1][2]
  • Worker: 2.64-3.07 mm ^[1][2]
  • Colony: Unknown, colony size has not been documented ^[1][2]
  • Growth: Unknown, no development data exists for this species
  • Development: Unknown, no direct observations exist. Based on related Vombisidris species and typical Myrmicinae patterns, expect 6-10 weeks at warm temperatures. (Development timeline is unconfirmed. Related species suggest moderate development speed, but specific data is lacking.)
• Antkeeping:
  • Temperature: Since they come from tropical Thailand, keep temperatures warm and stable, aim for 24-28°C. Avoid temperatures below 20°C for extended periods ^[1][2].
  • Humidity: High humidity is essential. They nest in dead twigs in humid forest-edge habitats. Keep the nest substrate consistently moist but not waterlogged. Mist occasionally and provide a water tube ^[1][2].
  • Diapause: Unknown. As a tropical species, a true diapause is likely not required. A slight winter temperature reduction (e.g., from 26°C to 22°C) may be beneficial but is not necessary ^[1][2].
  • Nesting: These tiny ants naturally nest in dead twigs. In captivity, they do well in small test tubes, Y-tong (AAC) nests with narrow chambers, or small 3D-printed formicariums. Escape prevention is critical, use fine mesh and tight fittings ^[1][2].
• Behavior: Vombisidris satunensis is not aggressive. Based on related species, they likely forage individually and are generalist feeders. Their tiny size (2.6-3.3 mm) means escape prevention is critical, they can squeeze through standard mesh barriers. As a member of Crematogastrini, they have a modified stinger for smearing venom, but they are harmless to humans.
• Common Issues: escape prevention is critical due to their tiny 2.6-3.3 mm size, use fine mesh barriers and tight-fitting lids., humidity control is important, too dry and colonies will fail, too wet and mold becomes an issue., as a newly described species (2023), there is no established husbandry knowledge, be prepared to experiment., colony size is unknown, start with small setups and scale up gradually., wild-caught colonies may have parasites or stress from collection, quarantine and monitor new colonies.

Appearance and Identification

Workers measure just 2.64-3.07 mm ^[1]. They have a distinctive yellow-brown color, head, mesosoma, petiole, and postpetiole are yellowish-brown, while the gaster is darker ^[1]. The entire upper body is covered in dense erect hairs ^[1]. A key feature is the short, straight propodeal spine, about twice as long as its width at the base ^[1]. The antennae are 12-segmented with a slender, down-curved scape ^[1]. Queens are slightly larger at 2.90-3.30 mm and have three ocelli (simple eyes) on the head, which the workers lack ^[1]. This species can be separated from similar Vombisidris by its small size, straight spines, and indistinct metanotal groove ^[1][2].

Natural History and Distribution

V. satunensis is endemic to Thailand, recorded from Satun Province (southern Thailand) and Nakhon Nayok Province (central Thailand) ^[2]. It inhabits lowland forest edges at about 100-200 m elevation ^[1][2]. The ants nest exclusively in dead twigs that are still hanging on shrub trees, a typical habit for the genus Vombisidris ^[1][2]. Alate (winged) queens have been found inside colonies collected in March and May, indicating that mating flights happen during Thailand's dry season (roughly February-May) ^[1][2]. The presence of both workers and alates in the same nest suggests these colonies were mature ^[1].

Housing and Nesting

Because these ants are so small, keep their enclosure scaled to size. A test tube setup works well for a founding colony, use a small tube with a cotton plug for a water reservoir ^[1]. For established colonies, use Y-tong (AAC) nests with narrow chambers or small 3D-printed formicariums ^[1]. You can also create naturalistic nests from hollow twigs or bamboo sections, mimicking their wild preference. The most important thing is escape prevention: standard mesh barriers are too large, use very fine mesh, or apply fluon to the container walls. Provide a humidity gradient with a damp area (e.g., a water tube or moist cotton) without making the whole nest wet ^[1][2].

Temperature and Care

Keep the colony warm, as they come from tropical Thailand. Aim for 24-28°C ^[1][2]. You can use a heating cable on one side of the nest to create a gentle temperature gradient so the ants can self-regulate. Avoid prolonged temperatures below 20°C. Room temperature (20-24°C) may work but expect slower development. If the colony seems sluggish, gradually increase warmth. Since this is a newly kept species, observe your ants and adjust conditions based on their activity ^[1][2].

Feeding and Diet

No dietary studies have been published for this species, but based on its subfamily and related Vombisidris species, it likely accepts generalist foods. Offer sugar water or honey as a constant energy source. For protein, provide small live prey, fruit flies, pinhead crickets, small mealworms, or other micro-insects. They may also collect honeydew from aphids in naturalistic setups. Feed small amounts and remove leftovers quickly to prevent mold. Be prepared to try different foods and watch what they accept.

Colony Establishment

Because this species was only described in 2023,captive breeding experience is minimal ^[1]. Alate queens have been collected in March and May, suggesting the nuptial flight season is the dry season ^[1][2]. If you obtain a queen, place her in a small test tube setup with moisture. The founding type (claustral, semi-claustral) is unknown, watch to see if she leaves the nest to forage. Expect a wait of several weeks to months before the first workers (nanitics) appear. Be patient, and document your observations to help build knowledge for the hobby ^[1][2].

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References