Eothalassius

{{short description|Genus of Dolichopodid flies}}

{{Automatic taxobox

| taxon = Eothalassius

| authority = Shamshev & Grootaert, 2005{{cite journal|last1=Shamshev|first1=I.V.|last2=Grootaert|first2=P.|year=2005|title=Eothalassius, a new genus of parathalassiine flies (Diptera: Empidoidea: Dolichopodidae) from Southeast Asia and Papua New Guinea|url=https://www.eje.cz/pdfs/eje/2005/01/16.pdf|journal=European Journal of Entomology|volume=102|issue=1|pages=107–118|doi=10.14411/eje.2005.016|doi-access=free}}

| type_species = Eothalassius platypalpus

| type_species_authority = Shamshev & Grootaert, 2005

}}

Eothalassius is a genus of flies in the family Dolichopodidae. It contains four described species, from Southeast Asia, Papua New Guinea, Costa Rica and the Mediterranean. It also contains three undescribed species, one from New Caledonia and two from Japan.{{cite journal|last1=Cumming|first1=J.M.|last2=Brooks|first2=S.E.|year=2019|title=Phylogenetic analysis and preliminary classification of the Parathalassiinae (Diptera: Empidoidea: Dolichopodidae sensu lato)|url=https://www.mapress.com/j/zt/article/view/zootaxa.4648.1.5/29229|journal=Zootaxa|volume=4648|issue=1|pages=111–129|doi=10.11646/zootaxa.4648.1.5|doi-access=}}{{cite journal|last1=Brooks|first1=S.E.|last2=Cumming|first2=J.M.|year=2022|title=New Australasian Parathalassiinae (Diptera: Dolichopodidae sensu lato)|journal=Zootaxa|volume=5188|issue=6|pages=521–543|doi=10.11646/zootaxa.5188.6.2|doi-access=free}}