Nematode-induced demasculinisation of Dolichopus males (Diptera: Dolichopodidae) Author Kahanpää, Jere text Zootaxa 2008 1689 51 62 journal article 10.5281/zenodo.180614 549e79e9-bf81-4d14-9633-8af319a5c9dd 1175-5326 180614 Dolichopus mediicornis Verrall, 1875 Dolichopus mediicornis Verrall, 1875 : 32 The status of Dolichopus mediicornis Verrall should be re-evaluated. This very rare species has only been found in Britain , France and Sweden ( Negrobov 1991 ). According to Becker (1917) it has all the characteristic features of a parasitised, demasculinised male. Unfortunately Becker based his description on a Swedish specimen. It is unclear whether he ever saw Verrall's types . Becker's demasculinised Swedish male may not be conspecific with Verrall's species.