Hydatostega

{{short description|Genus of flies}}

{{Automatic taxobox

| taxon = Hydatostega

| authority = Philippi, 1865{{cite journal|last1=Philippi|first1=R. A.|title=Aufzahlung der chilenischen Dipteren|journal=Verhandl. (Abh.) Zool.-Bot. Ges. Wien.|date=1865|volume=15|pages=595–782}}

| display_parents = 3

| type_species = Hydatostega poliogaster

| type_species_authority = Philippi, 1865

| synonyms = *Millardia Curran, 1934
(nec Thomas, 1911){{cite book|last1=Curran|first1=C. H.|title=The families and genera of North American Diptera|date=1934|publisher=Ballou Press|location=New York|pages=1–512 pp. 2 pls|url=https://www.biodiversitylibrary.org/item/29874#page/9/mode/1up |access-date=4 December 2021}}

}}

Hydatostega is a genus of flies in the family Dolichopodidae.{{cite book|last1=Yang|first1=D.|last2=Zhu|first2=Y.|last3=Wang|first3=M.|last4=Zhang|first4=L.|title=World Catalog of Dolichopodidae (Insecta: Diptera).|date=2006|publisher=China Agricultural University Press|location=Beijing|isbn=9787811171020|pages=1–704}} Most of its species are found in the Americas, where it is mainly restricted to montane habitats and high altitudes or latitudes, while three species are known from Tristan da Cunha, a group of islands in the South Atlantic Ocean. Hydatostega was formerly considered a synonym of Hydrophorus, but was recently restored as a separate genus.{{cite journal|last=Grichanov|first=I. Ya.|year=2005|title=Systematic notes on Dolichopodidae (Diptera) of Tristan da Cunha|url=https://www.zin.ru/journals/zsr/content/2005/zr_2005_14_1_Grichanov.pdf|journal=Zoosystematica Rossica|volume=14|issue=1|pages=171–172}}