Taxonomic revision and cladistic analysis of the genus Metalibitia Roewer, 1912 (Opiliones, Cosmetidae, Cosmetinae) Coronato-Ribeiro, Amanda Pinto-Da-Rocha, Ricardo Zootaxa 2017 4291 2 201 242 7PNXQ [351,483,439,465] Arachnida Cosmetidae Metalibitia GBIF Animalia Opiliones 4 205 Arthropoda genus    1. Free tergite III with similar-sized tubercles ( Figs 1D; 2A, B)................................................... 2  - Free tergite III with tubercles of different sizes ( Figs 1B, C; 2D)................................................3   2. Free tergite II with two higher lateral tubercles, three tubercles united at the base to apex on paracheliceral projections ( Fig. 1A), femur IV with retroapical ventral apophysis long and rounded and retrolateral spine on tibia IV ( Figs 5A, E; 7E)..................................................................................................  M. adunca.  - Free tergite II with similar sized tubercles, two tubercles on paracheliceral projections ( Figs 1D; 2A, B) and tibia IV with tubercles and small tubercles ( Figs 7D, H; 8A, F)............................................................ 4   3. Femur IV with one retrolateral rounded tubercle on distal portion higher than the other ones ( Figs 5C, G; 6D, I)..........5  - Femur IV with retrolateral distal tubercles of similar sizes ( Figs 5B, F).................................  M. argentina   4. Tubercles of coxa II falciform, surpassing the apex of coxa ( Figs 2C, E), retrolateral region of trocanter IV smooth, femur IV straight ( Figs 6C, H, E, J)...............................................................................8  - Tubercles of coxa II straight, not exceeding the apex ( Figs 2A, B), retrolateral region of trocanter IV with one or more tuber- cles, femur IV curved ( Figs 6F, G)........................................................................6   5. Tibia IV with apophyses on ventral region ( Fig. 8I)....................................................  M. tibialis  - Tibia IV with only tubercles ( Fig. 7C).............................................................  M. borellii   6. Trochanter IV with row of five retroventral tubercles united at base, femur IV with one retroapical tubercle with pointed apex ( Figs 6B, G), tibia IV with prolateral row of tubercles ( Figs 8B, G)...................................  M. rosascostai  - Trochanter IV with group of retroventral tubercles, femur IV with retroapical similar-sized tubercles ( Figs 5D, H; 6A, F), apex of tibia IV with similar-sized of all tubercles ( Figs 7D, H; 8A, F)................................................ 7   7. Pedipalpal femur with six ventral tubercles, three ventroapical tubercles ( Fig. 3C) and median portion of leg trochanter IV with set of five-seven tubercles ( Figs 5D, H).........................................................  M. brasiliensis  - Pedipalpal femur with nine ventral tubercles, being two of them ventroapical ( Fig. 3D), and distal portion of leg trocanter IV with group of four tubercles ( Figs 6A, F)......................................................  M. paraguayensis   8. Free tergite III with median tubercles fused and highest, coxa II with retrolateral tubercle ( Fig. 2E)......  M. abuna  sp. nov.  - Free tergite III with central tubercles separated, coxa II only with prolateral tubercle ( Fig. 2C).............  M. santaremis