Sciarosoma nigriclava

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Ordo: Diptera
Familia: Sciaroidea incertae sedis
Genus: Sciarosoma


Sciarosoma nigriclava (Strobl, 1898) comb. n.Wikispecies linkZooBank link

  • Trichosia nigriclava Strobl, 1898[1]: 281-282.
  • Sciarosoma borealis Chandler, 2002[2]: 125-126, figs. 64-67 syn. n.

Type material

Holotype ♂, no. 3069 in NMBA, leg. Strobl, 20.05. (?)1897.

Type locality

Austria, Styria, Gesäuse

Additional material examined

Germany: 1 ♂, Baden-Württemberg, Black Forest, Todtnau, Wilhelmer Hütte, Malaise trap, Doczkal, 8.-30.05.2003, PKHH 5113; Sweden: 3 ♂, Härjedalen, Nyvallen, Jämtlands län, Nyvallens fäbod: alpine birch and spruce wood, Malaise trap, Swedish Malaise Trap Project, 4.7.-04.08.2004, NHRS 3435, 3436, 4342.


See original description (Chandler 2002)[2] and the detailed additional redescription of both sexes (Jaschhof et al. 2006)[3].


Sciarosoma nigriclava is currently the only representative of the enigmatic genus Sciarosoma and unmistakable by the wing venation, the wing trichiation and the shape of the hypopygium. Hence the identity of the holotype of Trichosia nigriclava with Sciarosoma borealis is doubtless. Menzel (1992)[4] had studied the studied the holotype earlier and excluded Trichosia nigriclava from the family Sciaridae but without assigning it to any other family of Diptera. This becomes clear, because at that time Sciarosoma borealis was not yet described.


lat. niger = black, clavus = nail


Jaschhof et al. (2006)[3] suppose, that the species is confined in Northern Europe to untouched old coniferous forest. The flight period was found to be short and restricted to late spring and early summer. The new records, which are mentioned above, mainly confirm this assumption, but the specimens from Härjedalen were collected after midsummer. The records from Central Europe all stem from montane regions, indicating that Sciarosoma nigriclava has a strict boreomontane distribution.


Austria[1], Czech Republic[2], Finland[2][3], Germany[5], Norway[2], Sweden[3].



  1. 1.0 1.1 Strobl, G. 1898: Die Dipteren von Steiermark. IV. Theil. Nachträge zum III. Theil. Mittheilungen des Naturwissenschaftlichen Vereines für Steiermark, 34(1897), 277–297. BHL
  2. 2.0 2.1 2.2 2.3 2.4 Chandler, P.J. 2002: Heterotricha Loew and allied genera (Diptera: Sciaroidea): Offshoots of the stem group of Mycetophilidae and/or Sciaridae? Annales de la Societe Entomologique de France, 38, 101–144. PDF
  3. 3.0 3.1 3.2 3.3 Jaschhof, M.; Jaschhof, C.; Viklund, B.; Kallweit, U. 2006: On the morphology and systematic position of Sciarosoma borealis Chandler, based on new material from Fennoscandia (Diptera: Sciaroidea). Studia Dipterologica, 12, 231–241. PDF
  4. Menzel, F. 1992: Beiträge zur Taxonomie und Faunistik der paläarktischen Trauermücken (Diptera, Sciaridae). Teil I. - Die Stroblschen Sciaridentypen des Naturhistorischen Museums des Benediktinerstifts Admont. Beiträge zur Entomologie, 42(2).
  5. Kallweit, U.; Jaschhof, M. 2004: Sciarosoma borealis Chandler, 2002: a remarkable addition to the German fauna of Sciaroidea (Diptera: Bibionomorpha). Studia dipterologica, 11(1), 127–128.