Mycetophila ruficollis Meigen, 1818

Male terminalia. Posterior margin of gonocoxite undulate or slightly concave ventromedially, and with abrupt and blunt projections laterally. Posterior impression wide and uncompressed. Anterior impression with wide arms which are abruptly divergent anteriorly. Ventral branch of gonostylus with short and semicircular posterior process, with minute warts; ventral surface with long and slender bristles deviating from other setosity; spine 1 slender, sharply pointed, about half as wide as spine 2; spine 2 blunt, about half as high as spine 1; spines 3 and 4 smaller, sharply pointed, close to each other. Dorsal branch of gonostylus abruptly narrowed beyond the medial bristle. Posterior margin proximally from medial bristle with 7–9 gradually diminishing bristles; internal surface with a stronger seta next to the medial bristle. Lateral margin without concavity, almost straight. Basal angle slightly rounded, basal margin with few setae. Distal posterior process very shallow, almost unnoticeable; proximal posterior process high and massive, apically rounded. Distal posterior process with setae, proximal posterior process apically bare. Dorsal surface with a distinct band of setae from base of posterior processes to basal angle. Ejaculatory apodeme proximally narrows, with campanulate base and narrow rim. Aedeagal guides wide, apically widened and rounded, not extending beyond aedeagus distally; lateral impressions wide. Aedeagal apodemes laterally angular.

Intraspecific variation. The combination of wide 4th and considerably short 5th palpal segments, the ventroapical margin of the gonocoxite without any medial projections and the apically abruptly narrowed dorsal branch of the gonostylus are unique among European species of the group.