Cataulacus hispidulus

Cataulacus hispidulus

Cataulacus hispidulus is a small, stocky arboreal ant native to the rainforests of Southeast Asia, found in Brunei, Indonesia (Sumatra), and Malaysia (Sabah, Sarawak). Workers measure 4.6-5.8mm with a distinctive appearance featuring a coarse network-like sculpturing (rugoreticulum) on the head and body, shiny interspaces, and abundant yellowish-white hairs. The species is easily recognized by its short, broad build and the unique shape of its petiole with a complex ventral process. Queens are larger at 7.2mm. This is a tropical rainforest species that lives and forages on vegetation, typically in the canopy layer.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the rainforests of Borneo, Sumatra, and surrounding islands in the Indomalayan region. Specimens have been collected on vegetation in lowland primary rainforest areas ^[1].
• Colony Type: Colony structure is not well documented in scientific literature. As a Cataulacus species, they likely form moderate-sized colonies, though exact colony size estimates are unavailable.
• Size & Growth:
  • Queen: 7.2mm
  • Worker: 4.6-5.8mm
  • Colony: Unknown, likely moderate based on related species
  • Growth: Unknown, estimated based on tropical Myrmicinae patterns
  • Development: Estimated 6-8 weeks at tropical temperatures (25-28°C) (Development time is estimated from related tropical Myrmicinae species, specific data for C. hispidulus is not available)
• Antkeeping:
  • Temperature: Keep at 24-28°C (warm tropical conditions). A gentle gradient is recommended. This is a lowland rainforest species from Southeast Asia, so warmth and stability are important ^[1].
  • Humidity: High humidity (70-85%) is essential. As a rainforest species collected on vegetation, they need consistently moist conditions. Mist regularly and provide a water source.
  • Diapause: No, this is a tropical species that does not require hibernation. Keep warm year-round.
  • Nesting: Arboreal ant that naturally nests in hollow twigs, branches, or under bark on trees. In captivity, they do well in acrylic nests, Y-tong nests, or naturalistic setups with twigs/branches. They prefer tight, enclosed spaces scaled to their small size.
• Behavior: These ants are arboreal and quite active on vegetation. They are not particularly aggressive but will defend their nest. Workers are medium-sized and capable climbers. Escape prevention should be good, they are not tiny ants but still use standard barriers. They likely forage for honeydew and small prey on vegetation.
• Common Issues: tropical species requires warm, humid conditions year-round, cold drafts can be fatal, arboreal nature means they need climbing surfaces and vertical space in captivity, wild-caught colonies may not adapt well to captive conditions, specific colony size and founding behavior are poorly documented, making care more challenging, rainforest species is sensitive to drying out, substrate must stay moist

Natural History and Distribution

Cataulacus hispidulus is found across the rainforests of the Indo-Malayan region, specifically in Brunei, Indonesia (Sumatra), and Malaysia (Sabah, Sarawak). This is a lowland rainforest species that lives exclusively in arboreal habitats, they are collected on vegetation, typically in the canopy or on tree trunks and branches. The species was originally described by Frederick Smith in 1865 from Sumatra, with later synonymization of Cataulacus hispidulus (described from Sarawak) as a junior synonym. The distinctive morphology includes a coarse rugoreticulum (network-like sculpturing) with shining spaces and abundant short, blunt hairs, this combination makes them easily recognizable among related species in the granulatus group. ^[1]

Housing and Nest Preferences

As an arboreal ant, Cataulacus hispidulus naturally nests in hollow twigs, dead branches, or under bark in the rainforest canopy. In captivity, provide setups that mimic this arboreal environment. Acrylic nests or Y-tong nests work well, but adding climbing structures (twigs, branches, cork bark) is beneficial. They prefer tight chambers and narrow passages scaled to their worker size (4.6-5.8mm). The nest should have high humidity, these ants are from consistently moist rainforest environments. Include a water source and ensure good ventilation to prevent mold while maintaining humidity. ^[1]

Temperature and Humidity Requirements

This is a tropical lowland species that requires warm, humid conditions. Keep temperatures in the range of 24-28°C year-round, they do not tolerate cool temperatures. A slight temperature gradient allows workers to choose their preferred zone. Humidity should be high (70-85%), mimicking the moist rainforest environment where they naturally live. Regular misting and a water reservoir in the nest help maintain appropriate moisture levels. Do not allow the nest to dry out, as this can be fatal for the colony. Since they are from Southeast Asian rainforests, no hibernation or winter rest period is needed. ^[1]

Feeding and Diet

Based on the genus Cataulacus ecology, these ants are likely omnivorous with a preference for honeydew from sap-sucking insects and small prey. In captivity, offer sugar water or honey as an energy source, and provide protein in the form of small insects (fruit flies, small crickets, mealworms). As arboreal foragers, they may prefer feeding stations placed on vegetation or climbing surfaces rather than on the ground. Feed protein 2-3 times per week and keep a constant sugar source available. Remove uneaten prey after 24 hours to prevent mold.

Behavior and Colony Dynamics

Cataulacus hispidulus workers are active foragers on vegetation, climbing skillfully to reach honeydew sources and prey. They are not among the most aggressive ant species but will defend their nest vigorously if threatened. Workers are medium-sized (4.6-5.8mm) and relatively robust. The colony structure is not well documented, but based on related species, they likely form single-queen colonies with moderate worker populations. The species has been studied genetically, polymorphic microsatellites have been identified, indicating some genetic diversity within populations. They are primarily active in the warmer, humid conditions of their natural rainforest habitat.

Frequently Asked Questions

References