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Key: The Palaearctic species of Sylvicola (Diptera: Anisopodidae)
A key based on the works by Krivosheina & Menzel (1998), Haenni (1997) and Søli (1992).
References
Haenni, J.-P., 1997. Anisopodidae (Diptera) de la faune de Suisse, avec la description d'une espèce nouvelle. - Mitteilungen der Schweizerischen Entomologische Gesellschaft 70: 177-186.
Krivosheina, N.P., & F. Menzel, 1998. The Palaearctic species of the genus Sylvicola Harris, 1776 (Diptera, Anisopodidae). - Beiträge zur Entomologie 48(1): 201-217.
Michelsen, V., 1999. Wood gnats of the genus Sylvicola (Diptera, Anisopodidae): taxonomic status, family assignment, and review of nominal species described by J.C. Fabricius. - Tijdschrift voor Entomologie 142(1): 69-75. (PDF)
Søli, G.E.E., 1992. The Norwegian species of Sylvicola Harris, 1776 (Diptera: Anisopodidae). - Fauna Norvegica, Serie B 39: 49-54.
Last modified 29/06/2017 13:40 by Paul BeukNo of couplets: 11

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Key
1a
The bases of veins M1 and M2 arising from the discal cell at the same point, if a crossvein between them is present, then it is no more and 1/4-1/6 as long as the crossvein between M2 and M3 . Males holoptic . Distal part of R4+5 without dark marking. Male genitalia with basal ring that has a deep anteroventral concavity; hypoproct consisting of single, narrow lobe or of two lobes that are joint at the bases; claspers thin and S-shaped .
subg. Anisopus Meigen
2
b
Veins M1 and M2 arising separately from the discal cell, the distance between their bases at least 2/3 the length of the crossvein between M2 and M3 . Male holoptic or dichoptic. Distal part of R4+5 with dark marking of varying intensity. Basal ring of male genitalia without anteroventral concavity; hypoproct broad, either with or without shallow posterior concavity; claspers not developed .
subg. Sylvicola Harris
5
 
2a
Wing with dark band posterior of R2+3 . Hypoproct with two broad, finger-like lobes .
S. (A.) punctatus (Fabricius, 1787)
 
b
Wing without dark marking posterior of R2+3 . Hypoproct differently shaped .
3
 
3a
Hypoproct with one pointed lobe; apex of gonocoxite with small oval plate that is beset with short setae . Female frons almost as wide as eye width (5 : 6).
S. (A.) fuscatoides Michelsen, 1999
 
b
Hypoproct with paired, apically tapering lobes; apex of gonocoxites with strongly sclerotized plate that is beset with long, golden setae . Female frons distinctly narrower than eye (2 : 3).
4
 
4a
Lobes of hypoproct rather slender and adjoining apically ; sclerotized plates on apices of gonocoxites with long internal projection, long golden setae only present on basal half and forming a tuft . [Female: Halters dark with pale knob. Wing with distance between R2+3 and R4+5 about twice as long as the distance between R4+5 and M1+2; discal cell pointed. ].
S. (A.) stackelbergi Krivosheina & Menzel, 1998
 
b
Lobes of hypoproct broader and shorter, apically somewhat diverging ; sclerotized plates on apices of gonocoxites without projection, simple, with rows of inwardly curved setae along its whole length, setae more or less forming a comb . [Female: Halters pale. Wing with distance between R2+3 and R4+5 about three times as long as the distance between R4+5 and M1+2; discal cell truncate .]
S. (A.) fuscatus (Fabricius, 1775)
 
 
5a
Wing with weakly developed yellowish spots on the apex of R4+5 and in middle of cell r1; wing membrane not darkened posterior of R2+3 . Eyes widely separated in males and females, frons slightly narrower than width of one eye. Gonostyles in male genitalia massive and broad; hypoproct broad and blunt apically, posterior margin almost straight and with pubescent lobes on anterolateral corners .
S. (S.) limpidus (Edwards, 1923)
 
b
Wing with brownish spots on the apex of R4+5 and in the middle of cell r1 and otherwise with several distinct and indistinct dark spots .
6
 
6a
Wing strongly darkened apically and with two isolated pale spots (those in r2+3 and r4+5 are not contiguous) . Halters with blackish knob. Gonocoxites swollen apically and massive, almost rectangular in basal half, narrowed and lightly S-curved apically .
S. (S.) suzukii (Matsumura, 1916)
 
b
Wing with pale spots in r2+3 and r4+5 contiguous or pale area larger and connected to pale areas posterior of R4+5 .
7
 
7a
Dark apical spot in wing isolated and as a rule at most as long as the distance to the tip of R2+3, posterior margin distinct or indistinct .
8
b
Dark apical spot usually without distinct posterior margin and connected posteriorly with the dark marking stretching across r1 and r2+3, as a rule at least 1.5 time as long as the distance to the tip of R2+3. Males holoptic. Distance between bases of M1 and M2 equal to or 1.5 as long as the distance between the bases of M2 and M3 .
11
 
8a
Males holoptic, frons no wider than one ommatidion . Gonostyles short. Apical spot of wing dark and distinct . [Median stripe on mesonotum reaching scutellum?]
9
b
Males dichoptic, eyes widely separated. Gonostyles elongated. Apical spot of wing with indistinct posterior margin . [Median stripe on mesonotum not reaching scutellum?].
10
 
9a
Gonostyles almost rectangular at base and with narrow pointed posterolateral projection, parameres (claspers?) not visible; aedeagal guide broad and posterior margin is clearly not its narrowest part .
S. (S.) zetterstedti (Edwards, 1923)
 
b
Gonostyles large, almost rectangular at base and with narrow truncate posterolateral projection; parameres well visible and with spoon-like apex; aedeagal guide less broad and gradually narrowing posteriorly . Female unknown.
S. (S.) baechlii Haenni, 1997
 
 
10a
Hypoproct broadly rounded and with distal pubescent lobes; gonostyles massive and without laterobasal projection . [Distance between bases of M1 and M2 about equal to distance between the bases of M2 and M3?]
S. (S.) cinctus (Fabricius, 1787)
 
b
Hypoproct narrowed apically, with posterior emargination and with median pubescent lobes; gonostyles narrower and with short laterobasal projection . [Distance between bases of M1 and M2 about equal to 1.5 the distance between the bases of M2 and M3?]
S. (S.) fenestralis (Scopoli, 1763)
 
 
11a
Pale spot in r2+3 distinct and surrounded by well developed dark spots; apex of R2+3 completely darkened . Halters pale. Hypoproct massive, almost rectangular; gonostyles massive and trapezium shaped .
S. (S.) japonicus (Matsumura, 1915)
 
b
Pale spot in r2+3 indistinct and surrounded by less distict dark markings; apex of R2+3 not darkened . Male halters with darkened knob. Hypoproct somewhat narrowed apically and with posterior emargination; gonostyles elongated and curved .
S. (S.) matsumurai (Okada, 1935)
 
 
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