Cyriocosmus sp. ventana

Not every tarantula has to be big to make an impression. The genus Cyriocosmus covers dwarf species from South America whose whole appeal fits into a few centimetres: contrasting abdominal patterns, a subtle sheen on the carapace and a neat, compact build. Cyriocosmus sp. ventana is a species not yet formally described; "ventana" is the working name used by keepers, its exact locality is still undocumented, and it turns up on stock lists only occasionally, which is part of its appeal for anyone building a dwarf collection. A grown specimen (pictured) has a golden-brown, densely haired carapace, black femurs and steel-grey, pale-striped lower legs.

Spiders of this genus are active and inquisitive. Youngsters dig readily, excavating a network of tunnels and choosing a spot along the enclosure wall from which to ambush prey. They become more secretive with age but still show themselves, especially in the evening. Temperament is calm: when disturbed they tend to retreat rather than stand their ground. It is a display species, and watching such a small predator at work can be more absorbing than many a larger tarantula. Dwarf species generally mature faster than the giants, so you can follow its development moult by moult without a years-long wait.

An L1 spiderling needs only a small, well-ventilated container with a few centimetres of coconut fibre. Keep the substrate slightly damp and never fully dry; regular misting of part of the enclosure leaves droplets on the walls for it to drink. Room temperature is fine, ideally 24-27°C. Feed small prey scaled to the spider, such as cut crickets or young roaches, and clear away leftovers so mould does not take hold in a small tub. After a moult give it a few days' peace before the next meal, and keep the container away from draughts and direct sun.

Cyriocosmus sp. ventana suits a keeper who already has a first tarantula and wants something less obvious. It takes up little space and needs no specialist equipment, while teaching patience and careful observation. It is also a chance to keep a species whose story is still being written.