Updated key to the identification of genera and species of the tribe Tanytarsini recorded in Eocene Baltic amber

1. Hypopygium with gonostyli straight, posteriorly directed (Figures 2-8) Chironominae 2
  -. Hypopygium with gonostyli bent, medially directed other Chironomidae (not keyed)  
2. Wing vein RM parallel or slightly oblique relative to R and M, anal lobe weak or not developed, squama bare (Figure 4.3, 4.4) Tanytarsini 3
  -. Wing vein RM transverse relative to R and M, anal lobe well developed, squama with fringe of setae other Chironominae (not keyed)  
3. Superior volsella stout, strongly elongated; gonostylus with subapical lobe on median margin (Zakrzewska and Giłka, 2015b, figures 2, 4); median volsella absent Eonandeva 4
  -. Superior volsella and gonostylus never as above, median volsella present   5
4. Gonostylus slender, subapical lobe small; median setae absent; superior volsella cylindrical; inferior volsella with slightly enlarged apical part (Zakrzewska and Giłka, 2015b, figure 2) E. helva  
  -.Gonostylus broad near apex, subapical lobe large; median setae present; superior volsella swollen in apical part; inferior volsella with distinctly enlarged head-like apical part (Zakrzewska and Giłka, 2015b, figure 4) E. latistyla  
5. Dorsomedian extension of eye well developed (Giłka et al., 2013, figures 2, 3, 6, 8; Zakrzewska and Giłka, 2015a, figures 5, 7). Wing vein R4+5 ending distal of M3+4 to wing apex (Figure 4.3, 4.4; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 1, 2, 4, 6, 7; Zakrzewska and Giłka, 2013, figure 1; Zakrzewska and Giłka, 2014, figure 1; Zakrzewska and Giłka, 2015a, figures 5, 7)   6
  -. Dorsomedian extension of eye not developed (Figure 7.4; Zakrzewska and Giłka, 2015a, figure 3). Wing vein R4+5 ending opposite or proximal of M3+4 to wing apex (Seredszus and Wichard, 2007, figures 18, 19, plates 5c, d; Zakrzewska and Giłka, 2014, figure 3; Zakrzewska and Giłka, 2015a, figure 3)   18
6. Superior volsella small, boomerang-shaped or cylindrical; median volsella with two slender falciform lamellae (Giłka et al., 2013, figures 1, 2; Zakrzewska and Giłka, 2014, figure 2) Archistempellina 7
  -. Superior volsella well developed, elongated and/or broadened, roundish, bean-shaped or reniform; median volsella never with two slender falciform lamellae (Figures 3, 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 4, 6, 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   9
7. Anal tergite with semicircular posterolateral lobes covered with dense setae; superior volsella boomerang-shaped, with triangular tip; stem of median volsella posteromedially directed, tip narrow (Zakrzewska and Giłka, 2014, figure 2) A. perkovskyi  
  -. Anal tergite without semicircular posterolateral lobes covered with dense setae; superior volsella cylindrical, swollen in distal part; stem of median volsella medially directed, tip swollen (Giłka et al., 2013, figures 1, 2)   8
8. Anal point acute, reaching over superior and median volsellae; stem of median volsella longer than its falciform lamellae (Giłka et al., 2013, figure 1) A. bifurca  
  -. Anal point with swollen roundish tip, reaching bases of median and inferior volsellae; stem of median volsella and its falciform lamellae of the same length (Giłka et al., 2013, figure 2) A. falcifera  
9. Eyes hairy; gonostylus with strong spine-like apical bristle (Giłka et al., 2013, figure 4) Corneliola
C. avia
 
  -. Eyes bare; gonostylus with simple apical seta at most (Figures 3, 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figures 6, 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   10
10. Superior volsella round with slightly projecting posterior part or reniform and posteriorly directed (Figure 3, Giłka et al., 2013, figure 6) Rheotanytarsus 11
  -. Superior volsella elongated, posteromedially or medially directed; if posteriorly directed, then with nipple-like extension (Figure 5; Giłka, 2010, plate 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2013, figure 2; Zakrzewska and Giłka, 2015a, figures 6, 8)   12
11. Anal point tapering to slender tip; superior volsella round; digitus present; stem of median volsella stout and short, simple, with pectinate or leaf-shaped lamellae fused at bases (Giłka et al., 2013, figure 6) Rh. alliciens  
  -. Anal point with swollen tip; superior volsella reniform; digitus not observed; stem of median volsella bone-shaped, with leaf-shaped separated lamellae (Figure 3) Rh. hoffeinsorum  
12. Anal point with horizontally expanded lateral enlargements and small distal section between; posteriorly directed bar present (Zakrzewska and Giłka, 2013, figure 2) Caladomyia
C. szadziewskii
 
  -. Anal point without lateral enlargements, distal section or bar (Figure 5; Giłka, 2010, plate 2; Giłka, 2011a, figure 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figures 6, 8) Tanytarsus 13
13. Wing veins R and M very short, nearly half as long as Cu, VRCu 1.70-1.82; stem of median volsella with setiform and slender subuliform lamellae (Giłka, 2010, plate 2) T. serafini  
  -. Wing veins R and M long, VRCu 1.16-1.52. Stem of median volsella with arcuate, spindle-shaped, leaf-shaped (foliate) lamellae (Figure 5; Giłka, 2011a, figure 2; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figures 6, 8)   14
14. Digitus well developed, extending beyond superior volsella (Zakrzewska and Giłka, 2015a, figure 6) T. glaesarius  
  -. Digitus not observed   15
15. Ultimate palpomere with strong stiff apical seta; anal tergite with longitudinal crest-like hump bearing median setae (Giłka, 2011a, figures 1, 2) T. fereci
  -. Ultimate palpomere without stiff apical seta; anal tergite without longitudinal hump, median setae absent (Figure 5; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figure 8)   16
16. Gonostylus straight, with long seta on apex; superior volsella finger-like, distinctly curved at mid length and medially directed; median volsella sickle-shaped with slender arcuate lamellae (Figure 5) T. crocota  
  -. Gonostylus curved at mid length or boomerang-like, with subapical tooth-like process; superior volsella bean-shaped or with nipple-like apical extension, straight, posteromedially or posteriorly directed; median volsella never sickle-shaped, bearing leaf-shaped (foliate) lamellae (Figure 6.1; Giłka et al., 2013, figure 7; Zakrzewska and Giłka, 2015a, figure 8)   17
17. Stem of median volsella bulb-shaped (Giłka et al., 2013, figure 7) T. congregabilis  
  -. Stem of median volsella straight (Zakrzewska and Giłka, 2015a, figure 8) T. protogregarius  
18. Gonostylus distinctly longer than gonocoxite (Seredszus and Wichard, 2007, figure 18) Stempellina
S. exigua
 
  -. Gonostylus shorter than or as long as gonocoxite (Figure 8; Seredszus and Wichard, 2007, figure 19; Zakrzewska and Giłka, 2014, figure 4; Zakrzewska and Giłka, 2015a, figure 4) Stempellinella 19
19. Gonostylus with apical nipple-like process; anal point with spinulae; superior volsella posteriorly directed; inferior volsella with beak-like protrusion (Zakrzewska and Giłka, 2014, figure 4) S. ivanovae  
  -. Gonostylus without apical nipple-like process; anal point without spinulae; superior volsella medially directed; inferior volsella without beak-like protrusion (Figure 8; Seredszus and Wichard, 2007, figure 19; Zakrzewska and Giłka, 2015a, figure 4)   20
20. Antennal flagellum consisting of 10 flagellomeres; median volsella shorter than superior volsella (Seredszus and Wichard, 2007, figure 19) S. bicorna  
  -. Antennal flagellum consisting of 13 flagellomeres, flagellomeres 11-13 or 12-13 fused in part (Figure 7.3; Zakrzewska and Giłka, 2015a, figure 3); median volsella longer than superior volsella (Figure 8.3; Zakrzewska and Giłka, 2015a, figure 4)   21
21. Median volsella (stem with its lamellae) distinctly shorter than gonostylus, bearing wide pectinate and foliate lamellae (Zakrzewska and Giłka, 2015a, figure 4) S. electra  
  -. Median volsella (stem with its lamellae) and gonostylus of similar length, bearing slender foliate lamellae, single lamella with strongly elongated filiform tip (Figure 8) S. fibra