Cyriopagopus lividus (Cobalt Blue Tarantula)
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Cobalt Blue Tarantula (Cyriopagopus lividus)
Cyriopagopus lividus is one of those foundational species that has held strong in the hobby for years. Adults display that unmistakable deep cobalt blue across the legs, especially along the femurs, contrasted by a muted gray to earthy brown carapace (head) and abdomen. They have a lean, long-legged build that matches their speed and attitude. Slings and juveniles start off subdued, usually a dull brown with faint abdominal striping that sharpens briefly before fading as the blue begins to develop, typically around 2.5 to 3 inches. Native to Thailand and surrounding regions, this is a true fossorial species that spends most of its time in a deep, webbed burrow, only occasionally appearing at the entrance, often at night.
Why Hobbyists Keep Cyriopagopus lividus
- Classic Blue Species: One of the original blue tarantulas in the hobby, with a rich, saturated tone that still holds up against newer species
- Burrowing Behavior: Builds deep, structured tunnels with heavy webbing, giving a more natural and functional enclosure dynamic
- Growth Transformation: The shift from dull, patterned juveniles to bold blue adults is gradual and rewarding to observe
- Strong Feeding Response: Typically a reliable eater that will ambush prey from the burrow entrance
- Presence Over Visibility: Not always out, but when they are, the contrast and posture make them stand out immediately
- Sexual Dimorphism: Mature males lose the blue and take on a more uniform brown tone, which is something to be aware of long term
Care Overview
- Enclosure: Fossorial setup, 2× leg span footprint, 3× height, with substrate depth 2–3× leg span to support deep, stable burrows
- Temperature: 65–75°F
- Humidity: Moderate to high, keep lower layers of substrate slightly damp while allowing the top to dry a bit, never swampy
- Diet: Crickets, roaches, and other feeders sized appropriately to the carapace (head)
- Temperament: Very defensive, fast, and prone to bolting, best suited for experienced keepers
Additional Notes or Considerations
This species really depends on depth. Without enough substrate, they cannot establish a proper burrow and will often stay stressed and reactive. Given the option, they will almost always choose to dig rather than use a surface hide. Expect most activity to happen out of sight, with occasional nighttime appearances near the burrow entrance. Their speed and unpredictability during maintenance is worth respecting, especially in tighter enclosures.
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Names & Classifications
How we measure invertebrates:
We measure tarantulas and spiders in diagonal legspan. This means the distance from the front right to back left leg (or vise versa) when the animal is stretched out.
Cenitpedes we measure the full length of the animal from the antennae to the back legs
Scorpions we typically measure the body-length of the animal.