Metalibitia rosascostai Capocasale, 1966

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: 224-228

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Metalibitia rosascostai Capocasale, 1966


Metalibitia rosascostai Capocasale, 1966  

( Figs. 2 View FIGURE 2 B; 3E; 6B, G; 8B, G; 12D –F)

Metalibitia rosascostai Capocasale, 1966: 638   [desc], fig. 3; 1968: 68 [cit]; 2003: 3 [cit]; Capocasale & Gudynas, 1993: 2 [cit]; Kury, 2003: 69 [cat].

Type material. URMU: 0.21/A, Capocasale-Bruno col., ♂ holotype; URMU FCE-OPI 0 82 1♂ 8♀ paratypes, examined; URMU: 0.21/B 1 ♀ alotype. Not examined.

Type locality. URUGUAY, Departments Durazno/ Florida/ Treinta y Tres, Cerro Chato.

Geographical distribution ( Fig. 14 View FIGURE 14 ): Limited to southern region oF Brazil, in the state oF Rio Grande do Sul (Santa Maria) and Uruguay (Canelones, Montevideo, Rivera, Treinta y Tres, Florida and Durazno).

Diagnosis. Resembles M. borellii   and M. tibialis   in having a retroapical tubercle on Femur IV ( Figs. 5 View FIGURE 5 G; 6B, I). DiFFers From these species in having Free tergite III with row oF similar sized tubercles ( Fig. 2 View FIGURE 2 B) ( M. borellii   has one high central tubercle with rounded apex, Fig. 1 View FIGURE 1 C, while M. tibialis   has an enlarged tubercle on Free tergite III, Fig. 2 View FIGURE 2 D), trochanter IV with Four large retrodorsal tubercles ( Fig. 6 View FIGURE 6 B) ( M. borellii   and M. tibialis   have small retrodorsal tubercles, Figs 5 View FIGURE 5 C; 6D), Five retroventral tubercles united at base, the distal tubercle being the highest and one retrolateral apical spiniForm tubercle ( Fig. 6 View FIGURE 6 G) ( M. borelli   has one retroproximal tubercle with apex directed dorsally and one retrodistal tubercle with base much larger than apex, Fig. 5 View FIGURE 5 G; M. tibialis   has only one retrodistal rhomboid tubercle, Fig. 6 View FIGURE 6 I).

Redescription. Male (FCE OP 321)

Measurements: dorsal scutum, total length 4.3; dorsal scutum, total width 4.2; prosoma length 1.3; prosoma width 2.2; Femur I length 1.8; Femur II length 3.2; Femur III length 3.1; Femur IV length 3.2; pedipalpal Femur length 1.0 mm.

Coloration in ethanol: Entirely brown.

Dorsum ( Fig. 2 View FIGURE 2 B): Anterior margin oF dorsal scutum with median portion smooth, with two high tubercles with rhomboid apex near paracheliceral projections. Lateral margins oF dorsal scutum with rounded tubercles, near areas I –IV. Domed ocularium without median depression, with ten small tubercles. Posterior margin oF dorsal scutum with a row oF 11 tubercles, the central pair larger than the others. Free tergite I with row oF 10 tubercles, II with row oF nine tubercles, III with row oF six tubercles. Anal operculum with 13 rounded tubercles irregularly distributed. All tubercles oF posterior margin, Free tergites and anal operculum have rounded apex. Free tergites leave a smooth space on median region.

Chelicera ( Fig. 2 View FIGURE 2 B): Bulla with one median retrolateral pair oF tubercles with Fused bases and one prolateral pair with the same shape, with two retroapical tubercles Fused at base. Segment II with Four teeth, segment III with three teeth.

Pedipalps ( Fig. 3 View FIGURE 3 E): Trochanter with one high ventral tubercle. Femur with Five dorsomedian tubercles united, Five dorsoapical tubercles, ventral row oF six setiFerous, low and rounded tubercles (the three in the middle higher than lateral tubercles) and three ventral apical tubercles. Tibia with rounded proapical projection, one tubercle on each apical dorsal lateral and one prolateral apical ventral spine, dorsal setiFerous small tubercles, and setae on ventral borders. Tarsus with dorsal and lateral setae and row oF Five ventral macrosetae, Five ventral prolateral macrosetae and two ventral retrolateral macrosetae.

Legs ( Figs 2 View FIGURE 2 B; 6B, G; 8B, G): Coxa I with one retrolateral basal tubercle, smaller than prolateral one. Coxa II with one prolateral tubercle, and one retrolateral apical tubercle with rhomboid apex. Coxa III with one long retrolateral tubercle. Coxa IV with only apex visible in dorsal view, tuberculated, with one dorsoapical prolateral apophysis and Four retroapical ventral tubercles. Trochanter IV with Four retrodorsal small tubercles, a row oF Five retroventral tubercles Fused at the base (the apical one being the highest), and one retroventral apical tubercle. Femur IV curved and small-tuberculated, with higher density oF small tubercles on prolateral, retrolateral and dorsoapical regions; one apical posterior tubercle with pointed apex, with three tubercles on base. Patella IV covered with small tubercles. Tibia IV dorsally tuberculated, with row oF 12 ventral small tubercles and retrolateral row oF seven tubercles with pointed apex. Tarsal Formula: 5 / 6 / 5 / 5.

Penis ( MZSP 16055) ( Fig. 12 View FIGURE 12 D –F): Truncus straight and continuous to ventral plate. Ventral plate wide with strong U-cleFt on distal margin, two –three macrosetae on ventroapical region; one pair oF minute macrosetae on median ventral region, the leFt pair more basally displaced than the right pair (group E). Dorsal side with two pairs oF small apical macrosetae (group C), one dorsal pair on median region oF ventral plate (group D), one basal pair oF macrosetae (group A). Glans narrower at stylus base. Stylus with truncated apex, bearing small Filaments. Female (FCE OP 321)

Measurements: (paratype FCE OP 082): dorsal scutum, total length 4.2; dorsal scutum, total width 3.7; prosoma length 1.3; prosoma width 2.0; Femur I length 1.6; Femur II length 2.6; Femur III length 2.2; Femur IV length 2.5; pedipalpal Femur length 0.7 mm.

Dorsum: Posterior margin oF dorsal scutum with row oF 16 tubercles with pointed apex, the median pair higher. Free tergite I with row oF 19 tubercles, II with row oF 14 tubercles, III with row oF 13 tubercles. The tubercles oF Free tergites have pointed apex and leave a smooth space on median region. Chelicera: Four basal rounded tubercles. Pedipalps: Femur with a row oF Four ventral tubercles and two retroapical tubercles. Leg IV: Trochanter granulated, with one retrolateral tubercle and one retroapical tubercle. Femur irregularly covered with small tubercles, without apical tubercle. Tibia granulated, without retrolateral tubercles. Tarsal Formula: 5 / 6–7 / 5 / 5.

Variation. The retroventral tubercles oF trochanter IV can be Fused From base to apex. The ventral row oF oF tibia IV can have tubercles oF varying sizes and with more rounded apex. The ventral tubercles oF pedipalpal Femur can be united From base to median region. Measurements ♂ (n=6): dorsal scutum, total length 3.3–4.1; dorsal scutum, total width 3.4–3.8; prosoma length 1.1–1.3; prosoma width 1.9–2.2; Femur I length 1.4–1.6; Femur II length 2.3–3.0; Femur III length 2.2–2.5; Femur IV length 2.5–3.0; pedipalpal Femur length 0.6–0.9 mm. Measurements ♀ (n=5): dorsal scutum, total length 3.8–4.2; dorsal scutum, total width 3.3–3.8; prosoma length 1.1–1.3; prosoma width 1.8–1.9; Femur I length 1.1–1.6; Femur II length 2.3–2.7; Femur III length 2.0–2.2; Femur IV length 2.4–2.6; pedipalpal Femur length 0.6–0.8.

Material examined. BRAZIL. Rio Grande do Sul State: Santa Maria , 29°40'59.2"S 53°49'03.2"W, 20.II.1980, D. Link leg., 25♂ 35♀ ( MCN 732 View Materials ) GoogleMaps   . URUGUAY. Montevideo Departament   , San Jose: Sierra Mahoma 34°04’45.8” S 56°53’39” W, 29.VIII.1965, F. Achaval leg., 2♂ 2♀ ( MNRJ 5514 View Materials ) GoogleMaps   ; Rivera Departament, Sierra de la Aurora 31°02’60” S 55°42’60” W, 29.XI.1959, D. Robayma leg., 1♂ 1♀ ( MNRJ 5515 View Materials )   ; Treinta y Tres Departament, 33° 14′ 0″ S 54° 23′ 0″ W, 19.XII.1960, no data, 2♂ 2♀ ( MZSP 16055 View Materials ) GoogleMaps   ; Santa Clara de Olimar , 32°50'00" S 54° 54′ 29″ W, 14.XII.1960, F.H.C leg., 1 ♂ 26 ♀ (FCE 321); same loc., 10.II.1960, L. Zolessi leg., 7♂ 2♀ (FCE 077). GoogleMaps  


Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo


McNeese State University


Museu Nacional/Universidade Federal de Rio de Janeiro














Metalibitia rosascostai Capocasale, 1966

Coronato-Ribeiro, Amanda & Pinto-Da-Rocha, Ricardo 2017

Metalibitia rosascostai

Kury 2003: 69
Capocasale 1993: 2
Capocasale 1966: 638