Winnertzia tridens

Jaschhof, Mathias & Jaschhof, Catrin, 2020, Reevaluation of species richness in Winnertzia (Diptera, Cecidomyiidae, Winnertziinae), with descriptions of 37 new species from Sweden, Peru and Australia, Zootaxa 4829 (1), pp. 1-72 : 55

Winnertzia tridens group

Diagnosis. The tridens group may be regarded as the counterpart of the solidaginis group insofar as it comprises species whose morphology does not qualify for classification in other subdivisions of Winnertzia and in which the aedeagal bulge is covered with small, randomly distributed knobs rather than lines of tiny spikes. The knobs have dark, apparently sclerotized apices that usually end in a microtrichium. In most of the species classified in this group the apex of the aedeagal apodeme has a pair of recurved processes, which gives a structure reminiscent of an arrowhead or inverted anchor, and the posterior edge of the ninth tergite is broadly rounded with a pair of subtriangular, microtrichose lobes inside. Species characterized in such a way form a subset referred to here as the W. tridens complex, which we assume is a monophyletic subgroup.

Species included. The tridens group contains the following species in Sweden (members of the W. tridens complex are marked with an asterisk): W. bicolor sp. nov., * W. feralis Mamaev (revived here from synonymy with W. tridens , see below), * W. hamatula sp. nov., W. inornata sp. nov., W. lapponica sp. nov., * W. longicoxa sp. nov., W. pratensis sp. nov., * W. pustulata Spungis , * W. pustulatula sp. nov., W. regia Mamaev , and W. silvestris sp. nov. Other Winnertzia belonging here are W. cumulata Mamaev , W. divergens Mamaev , W. kushkensis Mamaev , W. pravdini Mamaeva & Mamaev (whose presence in Sweden as reported by Jaschhof & Jaschhof (2013) is unsubstantiated, see below), * W. reducta Mamaev , W. rubricola Mamaev , and * W. semideserta Mamaev. We know of four other, apparently unnamed species of the tridens group in Sweden, which are briefly discussed under what we suppose are their closest relatives.