The note on marine dolichopodid flies from Thailand by Patrick Grootaert and Henk Meuffels (2001) found that 15 species 7 genera of long-legged flies in mangrove and beach along the Andaman Sea and Gulf of Thailand.
However, the discovery of new marine long-legged flies trend upward in each year. On the other hand, the most studies of marine long-legged flies are just focus on survey, classification, taxonomy.
Nevertheless, some of the taxonomic study is still ambiguous especially genus Phacaspis is very interesting because they are real marine long-legged flies and able to live in habitat among high salinity and full sunlight exposure while the study of this genus still lack molecular genetics information for explain about origin, evolution as well as solved problem of the classification.