Mycetophila idonea
after Jürgenstein et al., 2015
Male terminalia. Posterior margin of gonocoxite with slight convexity ventromedially, and with abrupt and blunt projections laterally. Posterior impression with considerably narrow base and widened posterior part. Anterior impression with narrow, anteriorly evenly divergent arms. Ventral branch of gonostylus with posterior process wide and shallow (asymmetrical), with minute warts; spine 1 and spine 2 almost the same high; spine 1 slender, evenly tapering and sharply pointed; spine 2 thicker and blunt; spines 3 and 4 smaller, blunt, with about equal distance between each other and spine 2. Dorsal branch of gonostylus evenly tapering, lateral margin without concavity; distal posterior process about half as high as proximal posterior process, both separated by deep concavity. Distal posterior process bears apical and subapical setae, proximal posterior process bare and apically rounded. Posterior margin proximally from medial bristle with 3-4 gradually diminishing bristles; internal surface with one somewhat stronger seta next to the medial bristle; otherwise the setosity has no special arrangement. Basal angle slightly rounded, basal margin with few setae. Ejaculatory apodeme with concave base and narrow rim. Aedeagus widened apically and truncated. Aedeagal guides with well outlined, wide lateral impressions; apically widened and rounded covering edges of aedeagus. Aedeagal apodemes laterally angular.
Intraspecific variation. In some specimens from Georgia and Poland the base of the ejaculatory apodeme is blunt, resembling that of M. strobli. In a few cases the spine 2 on the ventral branch of the gonostylus is slender.
Hosts. Mycetophila idonea has been reared from about 65 species of Agaricales and Russulales and also from Boletus impolitus (Yakovlev, 1994).
The species is widely recorded from Europe extending to the Middle East and Eastern Palaearctic (Chandler 2013). The species was erroneously reported as overwintering in Estonian caves by Kurina (1996); after critical study, the material was found to belong to M. uninotata. However, the occurrence in Estonia is confirmed by a new rearing record presented herein. The material from Georgia represents a new country record.