A revision of the genus Diopsina Curran (Diptera, Diopsidae) with description of a new species from Guinea-Bissau

Abstract

An updated diagnosis is given for the genus Diopsina and a key to the seven species presently recognised. From Guinea-Bissau, Diopsina fluegeli sp. n. is described. Based on new material and on earlier described specimens, updated diagnoses are given for all Diopsina species. Additional descriptive information is presented, especially for abdominal structures and on sexual dimorphism in relation to eye span. Photographs illustrate some earlier described species. Biometrical data are presented which support the earlier division of the genus into the Diopsina nitida-group and the Diopsina africana-group. Several morphological characters and the phylogenetic position of Diopsina are discussed. Only limited information on the ecology of Diopsina is available, but for species of the Diopsina africana-group a close relation with clumps of Cyperaceae appears confirmed.