"americamysis almyra" is native to shallow parts of the western atlantic ocean and gulf of mexico. its range extends from maryland to florida and the whole gulf of mexico, and includes the brackish waters of lake pontchartrain, st. andrews bay and chesapeake bay. its habitat is typically seagrass meadows and shallow marshy areas at depths of less than . it is tolerant of salinities ranging from 0 to 30 psu (practical salinity units) but is usually found in areas with a salinity below 20 psu.