Tanytarsus chinyensis

Giłka, Wojciech & Paasivirta, Lauri, 2009, Evaluation of diagnostic characters of the Tanytarsus chinyensis group (Diptera: Chironomidae), with description of a new species from Lapland, Zootaxa 2197, pp. 31-42 : 41

Key to males of European species of the Tanytarsus chinyensis group

1. Digitus with apical pear-shaped lobe ( Figs 19–21 ) ...................................................................................................... 2

-. Digitus without apical pear-shaped lobe ( Figs 28–31 ) ................................................................................................ 4

2. Wing membrane covered with macrotrichia apically ( Fig. 3 ); hypopygial anal point with strongly elongated narrow tip ( Figs 15–18 ); inferior volsella with transversally cut apex ( Fig. 27 ) ........................................... T. salmelai sp. n.

-. Wing membrane covered with macrotrichia on almost entire area ( Figs 1, 2 ); hypopygial anal point with short lance- olate or broadly rounded tip ( Figs 5–14 ); inferior volsella with widely rounded apex ( Figs 25, 26 ) ......................... 3

3. Anal tergite bearing median setae, basilateral setae absent; anal point lanceolate ( Figs 5–9 ); pear-shaped apical lobe of digitus c. 3 times shorter than superior volsella ( Fig. 19 ); inner margin of coxite above median volsella concave ( Fig. 22 ) ....................................................................................................................................................... T. brundini

-. Anal tergite bearing basilateral setae, median setae absent; anal point broadly rounded ( Figs 10–14 ); pear-shaped apical lobe of digitus c. 2 times shorter than superior volsella ( Fig. 20 ); inner margin of coxite above median volsella straight ( Fig. 23 ) ....................................................................................................................................... T. curticornis

4. Superior volsella circular, digitus parallel-sided with slightly swollen rounded apex ( Fig. 30 ) ............. T. heusdensis

-. Superior volsella heart-shaped, digitus thumb-like tapering to blunt apex ( Figs 28, 29, 31 ) ...................................... 5

5. Digitus-seta located on enlarged projection under anteromedian part of superior volsella, posteromedian lobe of superior volsella never hook-shaped ( Fig. 31 ) ........................................................................................... T. palettaris

-. Digitus-seta located on cylindrical tubercle at base of digitus, posteromedian lobe of superior volsella hook-shaped ( Figs 28, 29 ) ................................................................................................................................................................. 6

6. Hypopygial anal point acute ....................................................................................... T. cretensis ( Reiss 1987: fig. 1)

-. Hypopygial anal point blunt ..................................................................................... T. chinyensis ( Reiss 1987: fig. 2)

Figures

FIGURES 19 – 27. Hypopygial volsellae. 19 – 21: superior volsella and digitus, 22 – 24: median volsella and inner margin of coxite, 25 – 27: inferior volsella. 19, 22, 25: Tanytarsus brundini; 20, 23, 26: T. curticornis; 21, 24, 27: T. salmelai sp. n.

FIGURES 28 – 31. Superior volsella and digitus. 28: Tanytarsus chinyensis, 29: T. cretensis (according to Reiss 1987), 30: T. heusdensis, 31: T. palettaris.

FIGURES 1 – 3. Male wing. 1: Tanytarsus brundini, 2: T. curticornis, 3: T. salmelai sp. n.

FIGURES 5 – 18. Variability in hypopygial anal point. 5 – 9: Tanytarsus brundini, 10 – 14: T. curticornis, 15 – 18: T. salmelai sp. n.