Limulus polyphemus

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Facts
Latin name Limulus polyphemus
Local name Atlantic horseshoe crab
Family Limulidae - Limulus
Origin The Mexican Golf
Max length 60 cm (23.6")
As aquarium fish
Minimum volume 500 l (132 gal)
Hardiness Unknown
Suitable for aquarium Suitable for special aquariums
Reef safe Not reef safe
Aggressiveness Unknown
Feed
Recommended Small crustaceans (Krill, mysis, artemia...)
Descriptions and further reading
Family description (Limulidae)

Horseshoe crabs are not Crustaceans. They are actually closer related to spiders and scorpions than crabs.
I have placed them under Crustacean because many people think of them as crabs.

Horseshoe crabs requires a large aquarium with a deep sandbed.
In most aquariums they will starve. Live rock formations may damage horseshoe crabs.

References and further reading