Mycetophila britannica
After Jürgenstein et al., 2015
Male terminalia. Posterior margin of gonocoxite slightly concave ventromedially, and with abrupt and blunt projections laterally. Posterior impression wide. Anterior impression with anteriorly evenly divergent wide arms. Ventral branch of gonostylus with narrow, short and asymmetrical posterior process which bears minute warts; ventral surface with 6–9 long bristles deviating from other setosity; spine 1 and spine 2 of almost equal height and width; spine 1 sharply pointed; spine 2 blunt; spines 3 and 4 smaller, pointed and close to each other. Dorsal branch of gonostylus abruptly narrowed beyond the medial bristle; lateral margin with shallow concavity or almost straight; distal posterior process very small, separated from proximal posterior process by a narrow but distinct notch, both processes apically rounded. Posterior margin proximally from medial bristle with 5 gradually diminishing bristles followed by 2 small setae. Basal angle slightly rounded, basal margin with few setae. Distal posterior process apically with small seta, proximal posterior process apically bare. Ejaculatory apodeme with semi-rounded or proximally truncated base and without rim. Aedeagal guides wide, apically widened, extending beyond aedeagus distally, lateral impressions wide. Aedeagal apodemes laterally angular.
Intraspecific variation. Laštovka and Kidd (1975) figured the ventromedial margin of the gonocoxite with a small convexity medially that was not observed in the studied material. They also described two different forms of the dorsal branch of the gonostylus: 1) slender and slightly narrowing beyond the medial bristle, and 2) shorter and abruptly narrowing beyond the medial bristle. The last character resembles that of M. ruficollis, M. laffooni Laštovka, 1972 and somewhat also M. suffusala. All studied specimens had the dorsal branch of the gonostylus slender, corresponding to the first form. Laštovka and Kidd (1975) found M. britannica to be most similar to M. evanida. In some studied specimens from Greece, the spine 2 on the ventral branch of the gonostylus is more massive, being longer than the spine 1. In Greek specimens the spine 2 in the ventral branch of the gonostylus is blunt while it is sharply pointed in Italian specimens.
Hosts. Mycetophila britannica has been earlier reared from Polyporus squamosus, Armillaria mellea, Hebeloma crustuliniforme, Russula nigricans, Hypholoma sp. and Lactarius resimus (Laštovka and Kidd 1975, Yakovlev 1994, Chandler 2010)
after Fauna Europaea