• Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)
  • Blue Spider Crab (Neosarmatium rotundifrons)

Blue Spider Crab (Neosarmatium rotundifrons)

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Choose a Variant:


* For the safety of our animals, we now ship this crab exclusively via UPS Next Day Air. If your order contains this item, you will only see UPS Next Day Air as a shipping option during checkout *

PLEASE NOTE: This species is a semi-terrestrial crab. Its habitat must be at least half (and preferably more) land with freshwater. It is an ideal paludarium animal.


The Blue Spider Crab is a very rare semi-terrestrial species that is beautifully marked and grows to a larger size than many other ornamental crabs. It is communal with its own species and is an excellent choice for the paludarium!


The Blue Spider Crab (Neosarmatium rotundifrons) is a medium-sized, very colorful, semi-terrestrial species that is native to Sumatra, Indonesia and Samoa. It inhabits forest areas near streams, rivers, and ponds. It spends most of its time on land, but also often submerges in freshwater. It is communal with its own species. This rare species is not often seen in the paludarium hobby.


In nature, the Blue Spider Crab lives in leaf litter and vegetation. In the paludarium, it requires ample land area. It typically will not eat healthy plants, but it will often help keep them clean and it may consume dead leaves. Like most crabs, it needs plenty of cover, especially when molting, so lots of decor is necessary. While it is communal with its own species, it is often aggressive with other types of crabs. It is a skilled climber, so extra care must be taken to ensure that it does not escape its enclosure.


Like most crabs, the Blue Spider Crab is an omnivorous scavenger and an opportunistic hunter on occasion. It feeds on filamentous algae and detritus in the paludarium and will also readily accept high-quality dry foods that are rich in plant matter as well as protein. Fresh and dried vegetables are also excellent food sources, as are insects, worms, and other invertebrates. Due to its opportunistic nature, the Blue Spider Crab might eat other ornamental invertebrates and fish, so its tankmates must be chosen with great care.


*IMPORTANT* Please "Choose a Variant" above before adding this crab to your cart. We offer a "B-Grade" variant for these crabs. Our “B-Grade” crabs are simply specimens that are missing legs or claws unless otherwise stated. Loss of appendages is not permanent and happens commonly with crustaceans.  They are completely healthy with excellent coloration and will completely regenerate lost appendages within 1 to 2 molts.

What We Like About This Crab:
  • Generally peaceful with its own species
  • Fascinating behavior and beautiful coloration
  • Ideal for paludariums
  • Easy to feed
  • Excellent scavenger
  • Temperature: 75° - 82° F (24° - 28° C)
  • pH: 7.5 - 8.0
  • KH: 4 - 10 dKH
  • Humidity: 75+%
  • Minimum tank size: 30+ gallons for a male and 2 females. Larger colonies require larger tanks.
  • Diet: Omnivorous. High-quality sinking flakes and pellets, plants/algae, and freeze-dried or frozen meaty foods will be readily accepted. Cuttlebone or a similar material should be added to the aquarium to supplement calcium, which will aid in exoskeleton production
  • Social behavior: Peaceful with its own species. May fight with or prey on other species.
  • Origin: Java, Indonesia
  • Average adult size: 6 inches (15 cm)
  • Average purchase size: 3 inches (7.5 cm)
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