Hyadina viridula ( Robineau-Desvoidy, 1830 )

Stuke, Jens-Hermann, 2022, A Second European Axysta Species (Diptera: Ephydridae), Acta Zoologica Academiae Scientiarum Hungaricae 68 (2), pp. 159-168 : 166

Hyadina viridula ( Robineau-Desvoidy, 1830)

Hydrina viridula Robineau-Desvoidy, 1830: 795 ; locus typicus not given [presumably France]; no information available about type material, type missing from coll. Robineau-Desvoidy ( MATHIS & ZATWARNICKI 1995).

Remarks. Hydrina viridula was described only very briefly by ROBINEAUDESVOIDY (1830): “Longueur, 2/3 de ligne. Petite; noire; un peu de cendré sur les côtés du corselet; abdomen d’un noir verdoyant; face d’un brun flavescent; pattes noires; ailes claires et sans tache.» This description does not allow any definitive diagnosis, but HALIDAY (1856) nevertheless identified this species as a synonym of Axysta cesta . This was corrected by LOEW (1860), who placed Axysta viridula sensu Haliday as a synonym to A. cesta and stated that Hydrina viridula Robineau- Desvoidy, 1830 cannot belong to Axysta . LOEW (1860) did not attempt to place Hydrina viridula Robineau- Desvoidy, 1830, however, and consequently, it should be treated as a nomen dubium of the genus Hyadina (stat. rev.). SCHINER (1863) presumably overlooked the work of LOEW (1860) when he placed Hyadrina viridula as synonym of A. cesta . This was adopted, for example, by MATHIS and ZATWARNICKI (1995).