Cobalt Blue (Melopoeus lividus)

The Cobalt Blue Tarantula is one of the most famous and sought-after tarantulas in the hobby. Renowned for its breathtaking metallic cobalt-blue legs, this species combines stunning beauty with classic Old World attitude. Fast, defensive, and highly reclusive, it's a spider that demands respect and rewards experienced keepers with flashes of incredible color.

Quick Facts

• Common Name: Cobalt Blue
• Scientific Name: Cyriopagopus lividus
• Origin: Thailand, Myanmar, Laos, and Cambodia
• Habitat Type: Fossorial (burrowing)
• Size: 5–6 inches (12–15 cm) leg span
• Lifespan:
  • Females: 15–20 years
  • Males: 3–5 years
• Temperament: Defensive, extremely fast, and reclusive

Coloration

• Brilliant metallic cobalt-blue legs
• Dark grey to charcoal carapace and abdomen
• Blue coloration intensifies after molts
• One of the most vivid blue tarantulas in the world

Photos don't do it justice — seeing a mature C. lividus under natural light is unforgettable.

Housing

• Enclosure Type: Fossorial — deep substrate is essential
• Substrate: 8–10 inches of slightly moist substrate
• Humidity: 70–80%
• Temperature: 75–82°F (24–28°C)
• Decor:
  • Cork bark starter burrow
  • Leaf litter and moss
  • Water dish
• Ventilation: Good airflow while maintaining humidity

Once established, expect extensive tunnel systems and very little surface activity.

Feeding

• Diet: Crickets, roaches, locusts, mealworms
• Feeding Frequency:
  • Slings: 2–3x/week
  • Juveniles: Weekly
  • Adults: Every 10–14 days
• Powerful feeding response when prey enters the burrow

Why Keep One?

• Legendary electric-blue coloration
• Hardy and long-lived
• Fascinating burrowing behavior
• A must-have species for serious Old World collectors

Notes

• Not suitable for beginners
• Potent Old World venom
• Extremely fast and defensive when disturbed
• Often called a "pet hole" due to its reclusive nature
• Never rely on seeing it daily — most of its life is spent underground