Panamic Arrow Crab
The Panamic Arrow Crab, also known as the Spider Crab, has extremely long legs. It is called the Arrow Crab because of the shape of the body and head. The size is variable, many reaching six inches, and some up to 10 inches. Females may be dramatically smaller. They normally inhabit portions of the reef usually associated with a small cave or crevice.
It is a hardy, long-lived invertebrate that can be housed in the reef aquarium. This crab has been known to attack crustaceans such as Banded Coral Shrimp, and may even attack small slow-moving fish. All crabs are opportunistic feeders and if insufficient food is present they may pick at mushrooms or polyps searching for food. However, Arrow Crabs may provide the beneficial service of eating smaller Bristle Worms.
| Size | Range |
|---|---|
| Male | Up to 10 inches |
| Female | Dramatically smaller than males |
| Habitat | Reef areas with small caves or crevices |
| Behavior | Opportunistic feeder; may eat crustaceans, fish, or polyps; eats bristle worms |
FAQ
What is the typical size of a Panamic Arrow Crab?
The size varies, with many reaching six inches and some growing up to ten inches. Females are typically much smaller than males.
Where does the Panamic Arrow Crab usually live in a reef tank?
It typically inhabits areas with small caves or crevices within the reef.
Does the Panamic Arrow Crab pose a threat to other tank inhabitants?
Yes, it may attack crustaceans like Banded Coral Shrimp and small slow-moving fish due to its opportunistic feeding behavior.
Sonia Berry –
The Panamic Arrow Crab has been a great addition to my reef tank. It’s active and helps control bristle worms. I placed it in a crevice area where it feels secure. It doesn’t attack my shrimp, which was my main concern. Just make sure there’s enough food available.
Melanie Clark –
I noticed it spends most of its time near the cave wall. It’s not aggressive toward my fish, but it does eat small polyps occasionally. I’ve been feeding it daily and it seems to be thriving.
Melanie Grant –
It’s a bit larger than expected and takes up space. I had to adjust my shrimp placement to avoid direct encounters. Still, it helps with cleaning the tank.