Distribution: This species has been reported from the United States and the Western Atlantic Ocean. Natural History Notes: Studies have showed that H. zostericola is a mesograzer which may be important in the transfer of primary production to higher trophic levels. Moreover, some preference experiments indicated that choice of seagrass species is not influenced by the available surface area of seagrass blades, nor by the presence of epiphytic food. Significant responses of the shrimp to the ambient light field, mediated by the seagrass canopy, were detected.