Metalibitia

Coronato-Ribeiro, Amanda & Pinto-Da-Rocha, Ricardo, 2017, Taxonomic revision and cladistic analysis of the genus Metalibitia Roewer, 1912 (Opiliones, Cosmetidae, Cosmetinae), Zootaxa 4291 (2), pp. 201-242 : 205

Key to males of Metalibitia species

1. Free tergite III with similar-sized tubercles ( Figs 1 D; 2A, B)................................................... 2

- Free tergite III with tubercles of different sizes ( Figs 1 B, C; 2D)................................................3

2. Free tergite II with two higher lateral tubercles, three tubercles united at the base to apex on paracheliceral projections ( Fig. 1 A), femur IV with retroapical ventral apophysis long and rounded and retrolateral spine on tibia IV ( Figs 5 A, E; 7E).................................................................................................. M. adunca .

- Free tergite II with similar sized tubercles, two tubercles on paracheliceral projections ( Figs 1 D; 2A, B) and tibia IV with tubercles and small tubercles ( Figs 7 D, H; 8A, F)............................................................ 4

3. Femur IV with one retrolateral rounded tubercle on distal portion higher than the other ones ( Figs 5 C, G; 6D, I)..........5

- Femur IV with retrolateral distal tubercles of similar sizes ( Figs 5 B, F)................................. M. argentina

4. Tubercles of coxa II falciform, surpassing the apex of coxa ( Figs 2 C, E), retrolateral region of trocanter IV smooth, femur IV straight ( Figs 6 C, H, E, J)...............................................................................8

- Tubercles of coxa II straight, not exceeding the apex ( Figs 2 A, B), retrolateral region of trocanter IV with one or more tuber- cles, femur IV curved ( Figs 6 F, G)........................................................................6

5. Tibia IV with apophyses on ventral region ( Fig. 8 I).................................................... M. tibialis

- Tibia IV with only tubercles ( Fig. 7 C)............................................................. M. borellii

6. Trochanter IV with row of five retroventral tubercles united at base, femur IV with one retroapical tubercle with pointed apex ( Figs 6 B, G), tibia IV with prolateral row of tubercles ( Figs 8 B, G)................................... M. rosascostai

- Trochanter IV with group of retroventral tubercles, femur IV with retroapical similar-sized tubercles ( Figs 5 D, H; 6A, F), apex of tibia IV with similar-sized of all tubercles ( Figs 7 D, H; 8A, F)................................................ 7

7. Pedipalpal femur with six ventral tubercles, three ventroapical tubercles ( Fig. 3 C) and median portion of leg trochanter IV with set of five-seven tubercles ( Figs 5 D, H)......................................................... M. brasiliensis

- Pedipalpal femur with nine ventral tubercles, being two of them ventroapical ( Fig. 3 D), and distal portion of leg trocanter IV with group of four tubercles ( Figs 6 A, F)...................................................... M. paraguayensis

8. Free tergite III with median tubercles fused and highest, coxa II with retrolateral tubercle ( Fig. 2 E)...... M. abuna sp. nov.

- Free tergite III with central tubercles separated, coxa II only with prolateral tubercle ( Fig. 2 C)............. M. santaremis

Figures

FIGURE 1. Habitus. Dorsal View of male of Metalibitia spp.: (A) M. adunca (SMF 143 / 9), (B) M. argentina (MACN 4497), (C) M. borellii (MNRJ 1374), (D) M. brasiliensis (MZSP 18313). Scale: 1 mm.

FIGURE 2. Habitus. Dorsal View of male of Metalibitia spp.: (A) M. paraguayensis (MACN 27632), (B) M. rosascostai (FCE 321), (C) M. santaremis (SMF 1491 / 13), (D) M. tibialis (SMF 122 / 4), (E) M. abuna sp. nov. (MZSP 58503), (F) Lateral View of M. paraguayensis. Scale: 1 mm.

FIGURE 3. Lateral View of male right pedipalp of Metalibitia spp. (A – F): (A) M. argentina (MACN 4497), (B) M. borellii (MNRJ 1374), (C) M. brasiliensis (MZSP 18313), (D) M. paraguayensis (MACN 30705), (E) M. rosascostai (FCE 321), (F) M. santaremis (MNRJ 8266). Scale: A – B: 100 µm; C – E: 200 µm; F: 500 µm.

FIGURE 5. Dorsal View of male leg IV (trochanter and femur) of Metalibitia spp. (A – D) Dorsal View: (A) M. adunca (SMF 143 / 9), (B) M. argentina (MACN 4497), (C) M. borellii (MNRJ 1374), (D) M. brasiliensis (MZSP 18313). Ventral View (E – H): (E) M. adunca (SMF 143 / 9), (F) M. argentina (MACN 4497), (G) M. borellii (MNRJ 1374), (H) M. brasiliensis (MZSP 18313). Scale: 1 mm.

FIGURE 6. Dorsal View of male leg IV (trochanter and femur) of Metalibitia spp. (A – E) Dorsal View: (A) M. paraguayensis (MACN 27632), (B) M. rosascostai (FCE 321), (C) M. santaremis (SMF 1491 / 13), (D) M. tibialis (SMF 122 / 4), (E) M. abuna sp. nov. (MZSP 58503). Ventral View (F – J): (F) M. paraguayensis (MACN 27632), (G) M. rosascostai (FCE 321), (H) M. santaremis (SMF 1491 / 13), (I) M. tibialis (SMF 122 / 4), (J) M. abuna sp. nov. (MZSP 58503). Scale: 1 mm.

FIGURE 7. Dorsal View of male leg IV (patella and tibia) of Metalibitia spp. (A – D): (A) M. adunca (SMF 143 / 9), (B) M. argentina (MACN 4497), (C) M. borellii (MNRJ 1374), (D) M. brasiliensis (MZSP 18313). (E – H) Ventral View: (E) M. adunca (SMF 143 / 9), (F) M. argentina (MACN 4497), (G) M. borellii (MNRJ 1374), (H) M. brasiliensis (MZSP 18313). Scale: 1 mm.

FIGURE 8. Dorsal View of male leg IV (patella and tibia) of Metalibitia spp. (A – E): (A) M. paraguayensis (MACN 27632), (B) M. rosascostai (FCE 321), (C) M. santaremis (SMF 1491 / 13), (D) M. tibialis (SMF 122 / 4), (E) M. abuna sp. nov. (MZSP 58503). Ventral View (F – J): (F) M. paraguayensis (MACN 27632), (G) M. rosascostai (FCE OP 321), (H) M. santaremis (SMF 1491 / 13), (I) M. tibialis (SMF 122 / 4), (J) M. abuna sp. nov. (MZSP 58503). Scale: 1 mm.