Libinia dubia is a common seagrass inhabitant, and is found in association with other organisms occurring in this habitat. Although the longnose spider crab is primarily a benthic species, it has been associated with several pelagic organisms, including: the loggerhead sea turtle, Caretta caretta (Frick et al. 2004); the cannonball jelly, Stomolophus meleagris (Corrington 1927, Phillips et al. 1969, Tunberg & Reed 2004); the sea nettle, Chrysaora quinquecirrha, the sea wasp, Chiropsalmus quadrumanus (Phillips et al. 1969); and the moon jelly, Aurelia aurita (Jachowski 1963). Locally, the most prevalent association is between L. dubia and S. meleagris. In 2004, a bloom of cannonball jellies was studied at and around the Fort Pierce Inlet in the southern half of the Indian River Lagoon (Tunberg & Reed 2004). Approximately 17% of the jellies sampled contained at least one L. dubia located under the bell. Most scientists believe that the crabs gain access to their hosts by attaching when the organisms drift toward the bottom, or by metamorphosing from larvae to juvenile directly on the host (eg. Corrington 1927). It is often difficult to determine the type of symbiotic relationship between species, but it is believed that the crab gains shelter and protection, transportation, and food from its hosts. In some instances, L. dubia has even been found to consume tissue from host jellies (Jachowski 1963, Phillips et al. 1969, Tunberg & Reed 2004).
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