Arrow Crab

Scientific Name: Stenorhynchus seticornis
Geographical Range: The Arrow Crab inhabits North Carolina to Florida and Texas. It is also found in the Bahamas, Bermuda and West Indies to Brazil.
Habitat: The Arrow Crab is found on rocks, shell sand, coral rubble bottoms, coral reefs, and is found from low tide lines to water that is 1489 meters deep.
Diet in the Wild: The Arrow Crab is mainly a nocturnal scavenger. It eats small feather duster worms and other tiny animals that inhabit the coral reef..
Conservation Status: Not protected.
Location in the Zoo: Aquarium (currently not on exhibit)

Physical Description:
The Arrow Crab has eight spider-like legs and has a head that is exceptionally pointed at the tip. The legs of an Arrow Crab can be more than three times its body length. The body of an Arrow Crab is composed of many colors. The whole body is covered in a golden-brown color, with white, brown, or gold stripes running along the crab's body. The ends of the legs are dark violet. As the Arrow Crab grows it will shed an outer layer of its skin called the exoskeleton. 
Social Organization:: The Arrow Crab is known for being territorial. The Arrow Crab is very docile towards divers, but acts very aggressively towards other sea creatures, including its own species. 
Special Adaptations:
The Arrow Crab is a nocturnal creature, meaning that it does most of its daily responsibilities at night time. The crab will do all of its scavenging during the night time. Since the Arrow Crab is nocturnal, it is rarely seen out during the daylight hours. These crabs do not fear divers who want to come and take pictures of it, but when it comes to other animals, even its own species, the Arrow Crab can be quite territorial. 

 Steve Norvich
Reproductive Behavior: 
In the course of mating, the male Arrow Crab will hold the female Arrow Crab against his belly so that he can place a sperm packet into the female. Once the female has been fertilized she will carry her eggs underneath her abdomen until the eggs are ready to hatch. The babies that emerge are called zoea, and once they are born they swim towards the surface of the ocean and feed on small plankton. As the young Arrow Crab continues to grow it will shed its exoskeleton and will replace it with a new one. It will continue to do this until the crab has reached its maximum size. 
The Animal at the Zoo:
Currently not on exhibit. 

Fabio Ehrengruber
Page Author:
Emilio Barela

Sources and Links: 
Meinkoth, Norman A. National Audubon Society Field Guide to North American Seashore. "Arrow Crab". pg. 66.

Block, Melissa. The University of Michigan. 
     " Stenorhynchus seticornis. Yellowline
       Arrow Crab".

Sea Frontiers. "The Arrow Crab: A Spindly Crawler". Spetember-October 1989. pg.303

Wrenbird's Reef Tank. "Arrow Crab".


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