Opisthopsis rufithorax

Description

Species description: Opisthopsis rufithorax

Opisthopsis rufithorax is an extremely interesting species of ant native to Australia. In the wild, it is mainly found in open woodlands, dry eucalyptus forests and warm-climate habitats. This species is also known as the ‘strobe ant’, as the workers move in a very distinctive, rapid, jerky manner, as if their movement were slightly ‘choppy’.

Their large eyes and contrasting colouring are what attract the most attention. The ants’ bodies combine shades of orange, red and black, making the colony look splendid in a well-prepared formicarium. The workers are active, alert and react strongly to movement in their surroundings, which makes observing them feeding particularly interesting.

Characteristics of Opisthopis rufithorax

• Queen: she is about 10–14 mm long, is noticeably larger than the workers and is responsible for the colony’s development.
• Worker bees: they are usually around 4–8 mm long, are agile, fast and very interesting to watch.
• Colour: orange and black, with a darker head and abdomen.
• Origin: Australia.
• Colony type: usually monogynous, i.e. with a single queen.
• Colony size: colonies do not usually grow to enormous sizes, which makes them easy to keep in a home breeding setup.
• Behaviour: fast, jerky movements, high alertness and heavy reliance on sight whilst exploring.

Breeding requirements for Opistophops rufithorax

Breeding Opisthopsis rufithorax is not particularly difficult, but it requires stable conditions and a well-secured enclosure. These ants are agile, fast and good climbers, so it is worth ensuring there is an anti-escape barrier, such as talc.

• Temperature: it is best to keep the nest within the range of 24–28°C and the enclosure within the range of approximately 21–30°C.
• Humidity: the nest should be moderately humid, ideally around 50–70 per cent. The enclosure may be slightly drier, but the ants must have constant access to water.
• Ant farm: a test tube or a small nest is a good place to start. It’s not a good idea to move a small colony into a large ant farm too quickly.
• Food: The diet consists mainly of sugars and protein. You can feed them ant nectar, honey diluted to the correct concentration, and live insects, particularly small cockroaches or pieces of mealworms.
• Hibernation: this species does not need to hibernate, which means it can remain active all year round.

Advantages of breeding Opisthopsis rufithorax

1. A distinctive appearance: its large eyes and orange-and-black colouring make it one of the most distinctive species in breeding.
2. An interesting behaviour: the workers’ jerky manner of movement sets them apart from many other ant species.
3. No hibernation: the colony does not need to hibernate, which makes it easier to keep them all year round.
4. Small colonies: this species does not form huge colonies, so it is easier to manage the space and conditions.
5. Active observation: worker bees react strongly to movement and food, so feeding them can be quite a spectacle.

Breeding instructions and advice

Upon receiving a colony of  Opisthopsis rufithorax, it is advisable to give them some peace and quiet and a few days to acclimatise. Small colonies are best kept in a test tube or a small nest; there is no need to rush the move to a larger formicarium. Too much space at the start may make the ants feel insecure and slow down their development.

It is important to maintain a stable temperature and ensure regular access to water. Protein-rich food should be provided in small portions, tailored to the size of the colony, so that leftovers do not remain in the enclosure. A source of sugars should be available on a regular basis, as active worker bees need energy for exploration.

Given the ants’ excellent climbing ability and speed, the formicarium should be airtight and fitted with an escape-proof barrier. This species is best suited to keepers who enjoy observing unusual behaviour, but who are also prepared to monitor the basic parameters of the colony.

Interesting facts about Opisthopsis rufithorax

The most distinctive feature of Opisthopsis rufithorax is the way they move. The workers move in short, rapid bursts, making them look as though they are ‘flashing’ as they run. Combined with their large eyes, this creates a very unusual effect, particularly when observed in the enclosure.

These ants rely heavily on their sight. They are able to react to movement around the formicarium, and their feeding behaviour is much more dynamic than that of many calmer species. As a result,  Opisthopsis rufithorax is an excellent choice for those looking for ants that are not only attractive but also genuinely fascinating to observe on a daily basis.