Crematogaster storki

Quick Summary

• Difficulty: Unknown, Insufficient data for difficulty rating
• Origin & Habitat: Endemic to Dumoga-Bone National Park in northern Sulawesi, Indonesia, at approximately 400m elevation. The type specimens were collected from a forest canopy using fogging, indicating an arboreal lifestyle in tropical rainforest ^[1].
• Colony Type: Unknown, colony structure has not been documented. Most Crematogaster species in the Orthocrema subgenus are monogyne (single queen) but this has not been confirmed for C. storki specifically.
• Size & Growth:
  • Queen: Unconfirmed, no queen caste has been described
  • Worker: Approximately 2-3mm total length, inferred from Crematogaster genus patterns ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, no development data available
  • Development: Unknown, no direct observations of development. Based on typical Crematogaster patterns, expect several weeks at tropical temperatures, but this is an estimate. (No specific development data exists for this species. Related Crematogaster species in tropical Asia typically develop from egg to worker in 4-8 weeks under warm conditions.)
• Antkeeping:
  • Temperature: Likely 24-28°C based on origin. Sulawesi has a tropical climate with year-round temperatures in the mid-to-high 20s Celsius. Start in this range and observe colony activity.
  • Humidity: Likely 70-85% based on tropical rainforest origin. Keep nest substrate moderately humid but allow some drying between waterings. The 400m elevation in Dumoga-Bone suggests montane rainforest conditions with consistent moisture.
  • Diapause: Unlikely, Sulawesi has no distinct winter. These ants probably remain active year-round if kept warm.
  • Nesting: Arboreal nesting habits inferred from fogging collection method. In captivity, they likely prefer nests in dead wood, cork, or similar materials that mimic their natural arboreal habitat. Small chambers scaled to their tiny size would be appropriate.
• Behavior: Behavior is unstudied. Crematogaster ants are generally known for their characteristic heart-shaped gaster (abdomen) which they can raise and curl over their bodies when threatened. They are typically arboreal and nest in pre-existing cavities rather than excavating their own tunnels. Their small size means excellent escape prevention is essential, they can slip through remarkably small gaps. Related species are generally non-aggressive but will defend their nest if threatened.
• Common Issues: escape prevention is critical due to their very small size, use fine mesh and tight-fitting barriers, no established care parameters exist, you are essentially pioneering captive husbandry, wild-caught colonies may carry parasites or diseases unfamiliar to captive antkeepers, tropical species may decline if temperatures drop below 22°C, limited availability makes colony establishment challenging

Discovery and Naming

Crematogaster storki was formally described in 2016 by Hosoishi and Ogata in their comprehensive revision of the Crematogaster subgenus Orthocrema in Asia. The species name honors Dr. N. Stork from the British Museum of Natural History, who collected the type material back in 1985 through fogging samples in Dumoga-Bone National Park. The specimens sat unidentified in museum collections for decades before being formally described, which is actually quite common for tropical arboreal ants that are difficult to collect and study ^[1].

Identification and Distinguishing Features

Identifying C. storki requires attention to subtle morphological details. The most distinctive feature is the propodeal spines, they curve upward at the tip when viewed from the side, which separates them from similar species like C. baduvi and C. brunensis that have straighter spines. The mesosoma (the middle body section) is notably smooth and shining, unlike some related species that have more sculptured surfaces. Workers also have a pair of long erect setae on the pronotum and mesonotum that are much longer than other body hairs. The body is red-brown with the last two antenna segments being distinctly yellow, creating a two-toned antenna appearance ^[1].

Distribution and Habitat

This species is currently known only from its type locality in Dumoga-Bone National Park in northern Sulawesi, Indonesia. The elevation of approximately 400m places it in a montane tropical rainforest zone. The fact that specimens were collected by fogging the forest canopy strongly suggests these ants are arboreal, living in pre-existing cavities in trees or under bark. Sulawesi is a biodiversity hotspot with many endemic species, and C. storki appears to be another example of an island-specific ant species with a very limited range ^[1].

Keeping an Undescribed Species

Crematogaster storki represents a unique challenge for antkeepers, there is no established husbandry information because the species was only described in 2016 and has never been kept in captivity that we know of. If you obtain a colony, you will be essentially pioneering its care. Start with conditions typical for tropical arboreal ants: warm temperatures (24-28°C), moderate to high humidity (70-85%), and nesting material that mimics dead wood or bark. Watch your colony closely for signs of stress or acceptance of foods, and be prepared to adjust conditions based on their behavior. Their tiny size means escape prevention must be excellent, even standard test tube setups may need additional barriers.

Feeding and Nutrition

No specific dietary information exists for C. storki. However, based on what we know about other Crematogaster species in the Orthocrema subgenus, they likely have a varied diet including honeydew (the sugary waste from aphids and scale insects), extrafloral nectars, and small insects. In captivity, you should offer a combination of sugar sources (honey water, sugar water) and protein (small fruit flies, pinhead crickets, other tiny insects). Their small size means prey items must be appropriately scaled, even small fruit flies may need to be killed or injured before offering. Observe carefully to see what they accept.

Frequently Asked Questions

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References