Lasius platythorax
Temperature
20–26 °C
Humidity
55–75%
Colony size
3,000–15,000
Queen size
8–10 mm
Worker size
3–5 mm
Hibernation temp
6 °C
Diet
Care Guide
Lasius platythorax is a charming and resilient ant species native to much of Europe, often found in moist woodlands and meadows. Though visually similar to the more familiar Lasius niger, this species is distinguished by its preference for higher humidity and slightly cooler conditions, making it a wonderful choice for keepers who want a robust, fast-growing colony with a gentle temperament. The queen measures 8 to 10 mm in length, while workers range from 3 to 5 mm, with no significant polymorphism—all workers look alike but vary subtly in size. Colonies can reach between 3,000 and 15,000 workers, offering a satisfying balance between manageable numbers and impressive activity.
One of the most endearing traits of Lasius platythorax is its foraging behavior. Workers are energetic and will quickly establish pheromone trails to food sources, relishing a diet of small insects such as fruit flies, mealworms, or cricket pieces. They also have a strong sweet tooth and will eagerly accept sugar water, honey water, or honeydew produced by aphids. A varied diet of proteins and carbohydrates is essential for healthy brood development and colony growth.
Care difficulty
Keeping Lasius platythorax is genuinely straightforward, making it an ideal species for beginners and intermediate keepers alike. The colony is claustral, meaning the queen seals herself in a founding chamber and raises her first brood without needing food—only a quiet, dark spot with adequate humidity. Once workers arrive, maintenance becomes simple: provide a steady supply of insects and sugar water, and ensure the nest remains moist. The most important commitment for this species is hibernation. Lasius platythorax requires a winter diapause at around 6°C for two to three months. Skipping hibernation can weaken the colony and reduce the queen’s lifespan, so plan accordingly with a refrigerator or cool cellar.
Housing
Lasius platythorax thrives in a formicarium that retains moisture well, such as a classic soil, plaster, or acrylic setup with a humidified nest section. The recommended temperature range is 20–26°C, and relative humidity should be kept between 55 and 75%. Regular misting of the outworld and nest entrance helps maintain the moisture level, especially during dry seasons. A test tube setup works beautifully for the first year, after which the colony can be connected to a larger arena. Provide a water source, such as a cotton-plugged tube or a test tube with a reservoir, and offer a shallow dish for sugar water that cannot drown the ants. These ants are not especially sensitive to light or vibration compared to some species, but they still appreciate a quiet corner away from direct sunlight.
First days after purchase
When your Lasius platythorax colony arrives, transfer them into their new home with care. If you received a queen with a few workers and brood, place the test tube or transport container into a small outworld, cover it to reduce light, and let the ants explore on their own terms. Do not disturb them for the first few days—watch from a distance to ensure they are drinking sugar water and accepting small protein offerings. Provide a droplet of honey water and a tiny piece of insect to confirm feeding. Once the colony settles, you will see the workers begin cleaning the nest and tending the brood. Within a week, you can start regular feeding and enjoy watching this lively, easygoing species build its empire.