Vollenhovia sakishimana

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to the Sakishima Islands and Ogasawara Islands of southern Japan (subtropical climate). Nests in soil or rotten wood in forest environments ^[1][2].
• Colony Type: Polygynous, colonies average 3.8 queens per nest in the wild ^[1]. Multiple queens can coexist peacefully in established colonies.
• Size & Growth:
  • Queen: 2.6 mm total length ^[2]
  • Worker: 2.0-2.1 mm total length ^[1][2]
  • Colony: Unknown, likely a few hundred workers at most given their tiny size
  • Growth: Moderate
  • Development: Estimated 6-8 weeks at optimal temperature (Direct development data unavailable, estimate based on related small Myrmicinae species.)
• Antkeeping:
  • Temperature: Keep at 22-26 °C. These are subtropical ants from southern Japanese islands and prefer warm conditions. Room temperature (around 22-24 °C) is typically suitable.
  • Humidity: Moderate to high, forest nesters in a subtropical climate. Keep the nest substrate damp but not waterlogged, similar to a wrung‑out sponge. Provide a moisture gradient so ants can choose a drier area.
  • Diapause: Probably minimal or none, being from subtropical islands, they likely don’t need a true hibernation period. They may show reduced activity in cooler months but formal diapause is probably unnecessary.
  • Nesting: Accepts most nest types suitable for small Myrmicinae. Y‑tong (AAC) nests, plaster nests, or naturalistic setups with soil/rotten wood work well. The key is maintaining consistent moisture.
• Behavior: Generally calm and non‑aggressive. Workers are tiny and forage quietly, you may not see much activity outside the nest. Their primary defense is a modified stinger that smears venom rather than stinging (typical of the Crematogastrini tribe), but they pose no threat to keepers. Escape prevention is critical due to their 2 mm size, they can slip through gaps that larger ants would miss. Use fine mesh on ventilation and seal all connections.
• Common Issues: tiny size causes high escape risk, all gaps larger than 1 mm must be sealed and fine mesh used on vents., humidity control is essential, too dry kills brood, too wet encourages mold., limited availability in the hobby makes it hard to obtain queens or established colonies., slow colony growth means patience is required during the founding stage.

Housing and Nest Setup

For these tiny ants, use a nest scaled to their small size. Y‑tong (AAC) nests work well because they maintain humidity and provide appropriately sized chambers. Plaster nests are another good option, they hold moisture consistently, which these forest‑dwelling ants appreciate. If using a naturalistic setup, provide a mix of soil and rotting wood pieces for them to nest in ^[1].

Because workers are only 2 mm long, escape prevention requires attention. Check that all tubing connections are tight, use fine mesh on any ventilation, and ensure your outworld doesn't have gaps larger than 1 mm. These ants are not strong climbers on smooth surfaces, but they will find any crack or seam. A thin barrier of fluon on the top rim of the outworld helps.

For the founding stage, a standard test tube setup works well. Keep the water reservoir moderate‑sized and pack the cotton snugly. Once the colony reaches about 20-30 workers, you can move them to a more elaborate formicarium if desired, though they do fine in test tubes long‑term.

Temperature and Humidity

Vollenhovia sakishimana comes from the subtropical Sakishima and Ogasawara islands of southern Japan ^[1][2], so they prefer warmer conditions. Keep the nest at 22-26 °C, this range supports good brood development. Room temperature in most homes (22-24 °C) is typically ideal.

Humidity needs are moderate to high. In nature, they nest in soil and rotting wood in forest settings, which maintain consistent moisture ^[1]. Keep the nest substrate damp but not saturated, similar to a wrung‑out sponge. The outworld can be drier (40-60% relative humidity is fine), but the nest area should retain moisture.

A heating cable or mat on one side of the nest can help maintain warmth. Always provide a temperature gradient so ants can move to cooler areas if needed. Place heating under or to one side of the nest, never directly on it, and use a thermostat controller to prevent overheating.

Feeding and Diet

Like most Myrmicinae, these ants are omnivorous. They accept sugar sources (honey water, sugar water) and protein foods. For protein, offer small prey items such as fruit flies, small mealworms, or other tiny insects. Because workers are only 2 mm, prey items should be appropriately sized, nothing larger than the ants themselves.

Feed small amounts of sugar water constantly (a cotton ball soaked in sugar water works well). Offer protein prey 2-3 times per week, adjusting based on colony size and consumption. Remove any uneaten prey after 24-48 hours to prevent mold.

During the founding stage, the queen does not forage, she relies on stored fat reserves to raise her first workers. Once workers emerge, they begin collecting food. Colonies this small don't consume huge amounts, so avoid overfeeding.

Colony Structure and Multi‑Queen Care

This is one of the key differences between V. sakishimana and many common ant species. They are polygynous, meaning colonies naturally have multiple queens, averaging 3.8 queens per nest in the wild ^[1]. This is unusual compared to species like Camponotus or many Lasius that are monogyne (single queen).

In captivity, you may receive a colony with multiple queens. This is natural and not a problem, the queens typically coexist peacefully. Polygynous colonies can grow faster because multiple queens lay eggs simultaneously.

If you are starting from scratch with multiple foundress queens, introduce them together at the same time. Housing multiple unrelated queens together after they have already established solo colonies is not recommended, they may fight. But founding together typically works fine for this polygynous species.

Growth and Development

The development timeline for this species has not been specifically studied, but based on typical Myrmicinae patterns and their small size, expect roughly 6-8 weeks from egg to worker at optimal temperature (around 24 °C). The first workers (nanitics) will be smaller than mature workers, which is normal.

Growth rate is moderate, not the fastest but not particularly slow either. Because workers are tiny, the colony won't reach massive numbers quickly. A mature colony probably has a few hundred workers at most.

Patience is key. The small size means each worker represents a larger proportion of the colony's resources, and population growth will feel slower than with larger ants. Do not overfeed, excess food and mold kill colonies more often than starvation does.

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