KEY TO SPECIES OF TINADYSDERINA 1. Males...................................................................................................................................................2 – Females...............................................................................................................................................7 2. Embolus bifid for most of its length (figs. 260, 272)...................................................................3 – Only distal half of embolus bifid....................................................................................................4 3. Embolus relatively short, wide (fig. 260)............................................................................ bremen – Embolus relatively long, narrow (fig. 272).......................................................................... pereira 4. Prolateral branch of embolus much shorter than retrolateral branch (fig. 248)......... gorgona – Prolateral and retrolateral branches of embolus subequal in length.........................................5 5. Tip of retrolateral branch of embolus narrow, not much wider than tip of prolateral branch (fig. 236)................................................................................................................................ planada – Tip of retrolateral branch of embolus wider (figs. 212, 224).....................................................6 6. Embolar branches approximate at their base (fig. 212).............................................. tinalandia – Embolar branches well separated at their base (fig. 224).................................................. otonga 7. Anterior genitalic process T-shaped (fig. 278)................................................................... pereira – Anterior genitalic process otherwise.............................................................................................8 8. Apodemes very short (fig. 242).......................................................................................... planada – Apodemes longer..............................................................................................................................9 9. Postepigastric scutum extending only to about two-thirds of abdomen length (fig. 263)....................................................................................................................................................... bremen – Postepigastric scutum extending to near spinnerets.................................................................10 10.Anterior genitalic process short, confined to atrial area (fig. 254)................................ gorgona – Anterior genitalic process extending anterior of genital atrium..............................................11 11.Genital atrium with posterolateral bulges (figs. 229, 230)................................................ otonga – Genital atrium without such bulges (figs. 217, 218).................................................... tinalandia

Published as part of Platnick, Norman I. & Berniker, Lily, 2013, ffie South American Goblin Spiders of the New Genera Pseudodysderina and Tinadysderina (Araneae, Oonopidae), pp. 1-44 in American Museum Novitates 2013 (3787) on page 27, DOI: 10.1206/3776.2, http://zenodo.org/record/4565956