Arrow crab
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| Stenorhynchus seticornis Herbst, 1788 |
The arrow crab (Stenorhynchus seticornis) is a saltwater invertebrate that resembles a harvestman (daddy long-legs) that may grow up to a length of about 6 inches (15 cm). It may be found in the wild on the tropical and subtropical Atlantic coasts of the Americas.
When kept in an aquarium, arrow crabs, while notorious for becoming territorial in reef aquariums, can nonetheless be helpful, by eating fireworms and other aquarium pests. They move surprisingly quickly for their ungainly appearance, and use their muscular legs to defend against predators.
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