Key to the Neotropical species of Tekellina Levi, 1957

1. Males (those of Tekellina miudinha Rodrigues & Estol sp. nov. unknown) .................................... 2

– Females ............................................................................................................................................. 9

2. Paracymbium retrolaterally very prominent in ventral view, thumb-shaped (Figs 2A, G, J, 6D) .... 3

– Paracymbium not thumb-shaped (Figs 2D, 6A) or not enlarged retrolaterally (Fig. 1D) ................ 5

3. Mesal arm of conductor medially positioned ................................................................................... 4

– Mesal arm of conductor apically positioned ..................................................................................... 7

4. Mesal arm of conductor coiled upwards (Fig. 2G) ........ Tekellina minor Marques & Buckup, 1993

– Mesal arm of conductor hook shaped (Fig. 6D) ....................... T. miuda Rodrigues & Estol sp. nov.

5. Coiled mesal arm (Fig. 2D) .............................................................................................................. 8

– Straight mesal arm (Fig. 6A) ............................................................................................................ 6

6. Mesal arm with sharp apex (Fig. 6A) ............................... T. picurrucha Rodrigues & Estol sp. nov.

– Mesal arm with blunt apex ...................................... T. araucana Marusik, Eskov & Ramirez, 2022

7. Long terminal claw, exceeding half of the paracymbium and mesal arm not coiled (Fig. 2A) .......... ....................................................................................................... T. bella Marques & Buckup, 1993

– Short terminal claw, not exceeding half of the paracymbium and mesal claw coiled inwards (Fig. 2J) ..................................................................................... T. guaiba Marques & Buckup, 1993

8. Stem of conductor developed (Fig. 5C, D) .................................. T. crica Marques & Buckup, 1993

– Stem of conductor not developed (see Levi 1957: figs 7–8) ........................ T. archboldi Levi, 1957

9. Epigynum with arched copulatory opening (Figs 1G, 2C) ............................................................. 10

– Epigynum smaller and straighten copulatory opening (Fig. 6C) .................................................... 12

10. Receptacles ½ distant from each other (Fig. 2F) ............................................................................ 14

– Receptacles ⅓ closer to each other ..................................................................................................11

11. Fertilization ducts close together (Figs 2F, 3C–D) ...................... T. crica Marques & Buckup, 1993

– Fertilization ducts far from each other ..................... T. araucana Marusik, Eskov & Ramirez, 2022

12. Abdomen with white pigment (Fig. 8J) .......................................................................................... 13

– Abdomen yellowish without white pigment (Fig. 9A–C) ............ T. bella Marques & Buckup, 1993

13. Light eyes (almost transparent) with AME darker, rounder receptacles (see Levi, 1957, Figs 11 – 12) ................................................................................................................. T. archboldi Levi, 1957

– Light brown eyes with AME darker, oval receptacles (Figs 8J–L, 4C–D, 2L) .................................. ................................................................................................... T. guaiba Marques & Buckup, 1993

14. Copulatory ducts long with more than three turns surrounding receptacle (Figs 2F, 6C, F–G) ..... 15

– Copulatory ducts with three turns surrounding receptacle (Fig. 2I) ................................................... ..................................................................................................... T. minor Marques & Buckup, 1993

15. Small copulatory opening (Fig. 6C) ............................................................................................... 16

– Large copulatory opening (Fig. 8F) ......................................... T. miuda Rodrigues & Estol sp. nov.

16. Round receptacles with a loop at the tip ........................... T. picurrucha Rodrigues & Estol sp. nov.

– Funnel-shaped receptacles distant between each other ....... T. miudinha Rodrigues & Estol sp. nov.