Colobopsis sommeri

Quick Summary

• Difficulty: Medium
• Origin & Habitat: New Caledonia and Loyalty Islands (Mare). Found in sclerophyll (dry) forests, particularly at station N3 in Nékoro forest, and also present in Pindaï and Tiéa sclerophyll forests ^[3][1].
• Colony Type: Colony structure is unconfirmed.
• Size & Growth:
  • Queen: size data unavailable
  • Worker: size data unavailable
  • Colony: Unknown
  • Growth: Unknown
  • Development: Unknown for this species (Development timeline is unconfirmed. Related Formicinae species typically take several months to raise first workers.)
• Antkeeping:
  • Temperature: Keep at 24-28°C. As a tropical New Caledonian species, they prefer warm conditions.
  • Humidity: Moderate to high humidity (60-80%). New Caledonia has a humid subtropical climate. Keep nest substrate moist but not waterlogged.
  • Diapause: Unlikely, being from a tropical island, they do not require true hibernation ^[3].
  • Nesting: In nature, Colobopsis typically nest in rotting wood, hollow twigs, or under bark. In captivity, a Y-tong (AAC) nest, plaster nest, or naturalistic setup with wood pieces works well. They prefer tight chambers scaled to their size.
• Behavior: Generally docile and non-aggressive, typical of Colobopsis and related Formicinae. Workers are moderate foragers, likely foraging for honeydew and small insects. Escape risk is moderate, use standard barrier methods but they are not particularly strong climbers. Their unique head-plugging behavior may be observed as a defensive response when nest is disturbed.
• Common Issues: limited availability, this species is rarely available in the antkeeping hobby due to its restricted range, specific humidity needs, tropical origins mean they can suffer in dry conditions, no documented captive breeding protocols exist for this species, size data is unavailable making it difficult to assess colony development, wild-caught colonies may struggle with captivity if not properly acclimated

Natural History and Distribution

Colobopsis sommeri is native to the New Caledonia region, found primarily on the main island of New Caledonia and the Loyalty Island of Mare ^[1]. This species was originally described by Forel in 1894 from specimens collected by M. Sommer, hence the species name 'sommeri'. The type specimens are syntypes of 3 workers held in the MHNG collection ^[2].

In their natural habitat of sclerophyll forests, these ants occupy a specific ecological niche. They are one of only three native ant species found across multiple dry forest sites in New Caledonia, along with Ochetellus glaber and Polyrhachis guerini ^[3]. This suggests they are well-adapted to the dry forest environment but may have limited distribution within the island. They have been recorded at station N3 in the Nékoro forest area and are also present in Pindaï and Tiéa sclerophyll forests ^[3].

The genus Colobopsis is known for a unique defensive behavior where workers use their specially adapted, bottle-shaped heads to plug nest entrances. This 'living door' behavior protects the colony from predators and intruders. While not specifically documented for C. sommeri, this is a characteristic trait of the genus that keepers may observe.

Housing and Nest Preferences

In the wild, Colobopsis species typically nest in rotting wood, hollow twigs, under bark, or in pre-existing cavities in trees. This makes them somewhat arboreal in their nesting preferences. For captive care, several nest types work well:

Y-tong (AAC) nests are an excellent choice, the narrow chambers mimic their natural cavities and the acrylic construction allows for easy observation. Plaster nests also work well, provided you maintain adequate humidity. For a naturalistic approach, include pieces of rotting wood or bamboo tubes in the outworld.

The key is providing appropriately sized chambers, Colobopsis prefer tight, snug spaces that match the dimensions of their natural nest cavities. Avoid large, open areas in the nest. In the outworld, include some climbing structures as they are moderately arboreal.

Escape prevention is important but not extreme, they are not particularly aggressive biters and don't climb smooth surfaces as well as some ants. Standard barrier methods (fluon on rim edges, tight-fitting lids) are sufficient.

Feeding and Diet

Like other Formicinae ants, Colobopsis sommeri likely has an omnivorous diet. Workers probably forage for honeydew from aphids and scale insects, collect nectar from flowers, and hunt small insects and arthropods for protein.

For captive feeding, offer a varied diet:

• Sugar sources: sugar water, honey water, or small drops of honey. Change these every few days.
• Protein: small insects like fruit flies, pinhead crickets, or mealworm pieces. Offer protein 1-2 times per week.
• Fresh water: always available, either via a water tube with cotton or moist sponge.

Since this species comes from a tropical environment with year-round foraging opportunities, they likely do not have strong seasonal food preferences. Keep sugar sources available constantly and offer protein regularly.

Temperature and Seasonal Care

As a species from New Caledonia (a subtropical island), Colobopsis sommeri requires warm temperatures. Keep the nest area at 24-28°C. This can be achieved using a heating cable placed on top of the nest (never under it, as that can cause drying). Room temperature may be sufficient if your home is naturally warm.

A temperature gradient is ideal, allow one area of the nest to be slightly cooler (around 22-24°C) so workers can self-regulate. If workers consistently cluster near the heat source, increase temperature slightly. If they avoid the heated area, reduce heat.

Regarding seasonal changes: being from a tropical island, they likely do not require a true hibernation period. However, they may show reduced activity during cooler months. Do not attempt to cool them significantly below room temperature, a drop to 18-20°C during winter is likely sufficient if they show any slowdown.

Humidity is important, aim for 60-80% relative humidity in the nest area. Mist occasionally if the nest appears dry, but avoid constant dampness which can lead to mold.

Colony Founding

The founding behavior of Colobopsis sommeri has not been documented in available research. Many Formicinae species are claustral, meaning the queen seals herself in a chamber and raises the first brood without foraging. However, this is not confirmed for C. sommeri specifically.

If you obtain a founding queen, keep her in a quiet, dark location with minimal disturbance. Use a small test tube setup with a water reservoir and keep it at stable room temperature (around 24-26°C). Do not check on her frequently, this can cause stress and abandonment. Wait until you see the first workers emerge before offering any food.

Frequently Asked Questions

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References