Size and growth
Adult Xenesthis immanis reach about 20–22 cm and are fast growers. Adult Xenesthis intermedia reach about 20–23 cm (8–9 in) and are fast growers. That affects how quickly Colombian Lesserblack Tarantulas and Venezuelan Blue Beauties move through sling and juvenile enclosure sizes.
Do not use size alone to estimate age in either Xenesthis immanis or Xenesthis intermedia. Sex, feeding and individual variation can change the pace of growth even when two spiders began at a similar size.
Enclosure and lifestyle
Colombian Lesserblack Tarantulas are terrestrial, while Venezuelan Blue Beauties are terrestrial. Build the Xenesthis immanis enclosure for a terrestrial spider and the Xenesthis intermedia enclosure for a terrestrial spider instead of assuming two tarantulas need the same shape of setup.
For Xenesthis immanis, substrate depth, retreat position and usable space should match its terrestrial lifestyle. Apply the same rule separately to Xenesthis intermedia; the enclosure should make normal behaviour easy rather than forcing either species into a generic layout.
Temperature, water and moisture
A practical temperature range for Xenesthis immanis is 20–26°C; for Xenesthis intermedia, it is 22–26°C. Stable room conditions are more useful for both species than chasing small fluctuations within those ranges.
For Xenesthis immanis, use moisture-retentive lower substrate with ventilation; avoid drying small juveniles completely. For Xenesthis intermedia, maintain moderate moisture gradient with a water dish and strong airflow. In both enclosures, keep fresh water available and adjust substrate moisture to how quickly the setup actually dries.
Temperament and maintenance
Xenesthis immanis is a New World species, while Xenesthis intermedia is a New World species. That background is useful when planning maintenance, but individual Colombian Lesserblack Tarantulas and Venezuelan Blue Beauties can still differ noticeably in speed and defensiveness.
With both Xenesthis immanis and Xenesthis intermedia, locate the spider before opening the enclosure, use long tools when they make the job safer and keep a catch cup ready for rehousing. Handling is not required for routine care.
Male and female lifespan
Male Xenesthis immanis generally live roughly 3–5 years, while females can live 12–15+ years. Male Xenesthis intermedia generally live roughly 3–5 years, while females can live 12–18 years.
Those lifespan ranges make sex particularly relevant when comparing Xenesthis immanis with Xenesthis intermedia. A confirmed female of either species is normally a much longer commitment than a mature male, and the exact age of an older juvenile may be impossible to know.
UK availability and trade notes
In the UK hobby, Xenesthis immanis is currently classed as uncommon, while Xenesthis intermedia is classed as rare. Stock changes between specialist sellers, captive-produced batches and show weekends, so availability should be checked at the time of purchase.
For records and purchases, use the scientific names Xenesthis immanis and Xenesthis intermedia as the main identifiers. Current trade notes list Xenesthis immanis as 'Not listed' and Xenesthis intermedia as 'Check current CITES rules before cross-border trade', so check current requirements before any international movement where controls may apply.
Practical difference in day-to-day care
The practical difference between Xenesthis immanis and Xenesthis intermedia comes from the combination of lifestyle, adult size, growth and moisture needs. Those factors change how much substrate, vertical space and maintenance access each enclosure needs.
Whichever species you keep, let the individual spider settle into an enclosure designed for its own biology. That applies equally to Xenesthis immanis and Xenesthis intermedia: fresh water, secure housing and patient observation matter more than trying to make the two species behave the same way.