Marl Pennant (Macrodipax balteata: Libellulidae) These small dragonflies range in size from 3.5-4.2 cm (1.4-1.7 in) long. Male, species sexually dimorphic. Total length of adults is 3.8-4.7 cm (1.5-1.9 in). Photographed in Galveston Island State Park, northeast of Jamaica Beach, Galveston County, Texas, USA. Barrier Island, coastal prairie at ca. 3 m (10.7 ft) elevation.