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Emerald Crab
| Scientific Name | Mithraculus sculptus |
| Diet | Omnivore; Bubble (Valonia) Algae, Scavenger |
| Alt Common Name | Jade, Mithrax, Mythrax, Spider, Green Clinging, and Hardback Crab |
| Family | Majidae |
| Origin | Caribbean |
| Aquarist Level | Novice |
| Reef Safe | With Caution † |
| Coloration | Green |
| Disposition | Moderate |
| Hardiness | Very |
| Mature Size | 2 inches |
| Reproduction Method | Females carry eggs on abdomen. |
| Sexual Dimorphism | Females have wider abdomens. |
| Venomous | No |
Notes: This species must molt in order to grow. Generally at night, it will lay on its back and exit its exoskeleton. A new exoskeleton is excreted and will harden over a period of several hours. The animal is vulnerable at this time and should not be disturbed. Proper iodine levels assist with successful molting.
† May eat fish smaller than itself when other food is not available. This is a rare occurance.