Metalibitia fuscomaculata H. Soares, 1970

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 : 220-221

Metalibitia fuscomaculata H. Soares, 1970

( Figs. 9 A–G)

Metalibitia fuscomaculata H. Soares, 1970: 326 [desc], fig. 6; Kury & Pinto-da-Rocha, 2002: 356 [cat]; Kury, 2003: 69 [cat]

Type material. MNRJ 5064 holotype ♀. Examined. HSPC 72 , paratypes 2♀. Not examined. Type locality. BRAZIL, Pará State, Paru River , east margin.

Geographical distribution ( Fig. 14 ): Only known From type locality.

Diagnosis. Resembles M. santaremis and M. abuna sp. nov., in having two separate tubercles on paracheliceral projections ( Figs 2 C, E, 9A); coxae I–III with FalciForm, elongated tubercles, surpassing the coxae apex ( Figs 2 C, E; 9A); Femur IV elongated ( Figs 6 C, E; 9D); Femur, patella and tibia IV smooth ( Figs 6 C, E; 8C, E; 9D, F); similar to M. santaremis in having six ventral tubercles on pedipalpal Femur ( Figs 3 F, 9C) ( M. abuna sp. nov. has eight, Fig. 4 F); to M. abuna sp. nov. in having coxa II with retrolateral tubercle ( Figs 2 E; 9A). It is distinguished From these species in having similar sized tubercles on Free tergite III ( Fig. 9 A) ( M. santaremis and M. abuna sp. nov. have the median tubercles highest, and M. abuna sp. nov. has two contiguous tubercles, Figs 2 C, E), and trochanter IV with one ventral proximal tubercle with rounded apex ( Fig. 9 E) (absent in M. santaremis and M. abuna sp. nov., Figs 6 H, J).

Redescription. Female (MNRJ 5064)

Measurements (holotype): dorsal scutum, total length 2.8; dorsal scutum, total width 2.6; prosoma length 0.8; prosoma width 1.5; Femur I length 1.2; Femur II length 2.3; Femur III length 1.8; Femur IV length 2.7; pedipalpal Femur length 0.6 mm.

Coloration in ethanol: Entirely pale brown.

Dorsum ( Fig. 9 A): Anterior margin oF dorsal scutum with median portion smooth, with two rhomboid tubercles, near paracheliceral projections. Lateral margins borders oF opisthosoma with rounded tubercles near areas I–IV. Domed ocularium, without median depression. All scutal areas entirely covered with small tubercles. Posterior margin oF dorsal scutum with a row oF 14 rounded tubercles, with paramedian region smooth. Free tergite I with a row oF 16 tubercles, II with row oF 14 tubercles, III with row oF 10 tubercles. Anal operculum with 17 rounded tubercles irregularly distributed. All tubercles oF posterior margin oF dorsal scutum Free tergites and anal operculum have rounded apex.

Chelicera ( Fig. 9 A): Bulla with three–Four tubercles on proximal margin, the prolateral one higher, two tubercles on retroapical region, and dorsolateral small tubercles. Segment II with three teeth, segment III with Four teeth.

Pedipalps ( Figs 9 B–C): Trochanter with one high ventral tubercle. Femur with dorsal tubercles united, Four dorsoapical tubercles, ventral row oF six rounded tubercles, and one proapical tubercle highest. Tibia and tarsus lost.

Legs ( Figs 9 A, D–G): Coxa I with one FalciForm prolateral long tubercle with pointed apex (reaching the coxa apex) and one retrolateral basal long tubercle. Coxa II with one FalciForm retrolateral apical tubercle with rhomboid apex and one prolateral tubercle with the same shape. Coxa III with one long prolateral pointed tubercle and one retrolateral. Coxa IV without apical region visible, tuberculated, with one dorsopical prolateral apophysis and three minute ventral tubercles, one retroapical tubercle with rounded apex. Trochanter IV with one dorsal tubercle, three small retrodorsal tubercles, with one ventral proximal tubercle with rounded apex. Femur IV entirely granulated. Patella and tibia IV tuberculated. Tarsal Formula: 5 / 5 / 5 / 5.

Male: unknown.

Material examined. Only the type material.

Figures

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 4. Dorsal View of male right pedipalp of Metalibitia spp. (A – C): (A) M. adunca (SMF 143 / 9), (B) M. tibialis (MZSP 67951), (C) M. abuna sp. nov. (MZSP 58503). Ventral View (D – F): (D) M. adunca (SMF 143 / 9), (E) M. tibialis (MZSP 67951), (F) M. abuna sp. nov. (MZSP 58503). 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 9. Female Metalibitia fuscomaculata (MNRJ 5064): (A) Habitus, dorsal View. (B – C) Right pedipalp trochanter and femur: (B) Dorsal View, (C) Ventral View. (D – E) Legs IV (trochanter and femur): (D) Dorsal View, (E) Ventral View. (F – G) Legs IV (patella and tibia): (F) Dorsal View, (G) Ventral View. Scale: 1 mm.

FIGURE 14. Records of geographical distribution of Metalibitia spp.: Argentina, Brazil, BoliVia, Paraguay and Uruguay.