Key to Subfamilies
| 1. Gonopods of male genitalia with gonocoxites and gonostyli remarkably elongate, more than six times longer than wider; gonocoxites and gonostyli with a longitudinal row of prominent, spiniform setae on their mesial surface (Figure 3.1, Figure 9.2, Figure 10.2, Figure 11.2, Figure 12.2, Figure 14.2, Figure 16.2); wings in fossil species small (up to 4 mm length) (Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 10.2, Figure 12.2, Figure 14.2) | NANNOTANYDERINAE subfam. nov. |
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| − Gonopods of male genitalia with gonocoxite shorter, usually about three of four times as long as wide, and broad at base gonocoxites and gonostyli without prominent spiniform setae; wing usually medium or large size (7-20 mm); (Figure 3.2) | TANYDERINAE Osten-Sacken, 1879 |
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Key to Genera
| 1. Vein Sc longer than half wing length (Figure 16.1); rostrum elongated (Figure 15), longer than the combined length of head and thorax. | Peringueyomyina Alexander, 1921 |
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| - Vein Sc reaching half wing length or shorter; head without developed rostrum | 2 | |
| 2. Vein R2 short, several times shorter than length of vein R2+3; vein Sc ending opposite or very close to fork of vein Rs into R2 and R3; at rest, gonopods about 3/4 abdomen length; (Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 10) | Nannotanyderus Ansorge, 1994 |
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| - Vein R2 evidently longer than R2+3; vein Sc ending before fork of R 2+3 into R2 and R3; gonopods shorter than 3/4 abdomen length | 3 | |
| 3. Vein Sc ending almost opposite one third length of R 2+3; vein R2 about twice as long as Rs; aedegal complex conspicuous; (Figure 13, Figure 14) | Coramus gen. nov. |
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| - Vein Sc ending opposite two third length of Rs; vein R2 about one fifth length of Rs; complex inconspicuous (Figure 12) | Dacochile Poinar and Brown, 2004 |
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