Metalibitia santaremis ( Roewer, 1947 ),

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: 228-229

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Metalibitia santaremis ( Roewer, 1947 )


Metalibitia santaremis ( Roewer, 1947) 

(Figs: 2C; 3F; 6C, H; 8C, H; 12G –I)

Paralibitia santaremis Roewer, 1947: 8  [desc], pl. 1, fig. 7

Metalibitia santaremis Ringuelet, 1959: 425  [by implication] [cit]; Kury, 2003: 69 [cat]; Pinto-da-Rocha & Bonaldo, 2006: 158 [cit]

Type material. SMF RII 1491/13, ♂ holotype. Examined.

Type locality. BRAZIL, Pará State, Santarém. 

Geographical distribution ( Fig. 14View FIGURE 14): Limited to northern Brazil, states oF Pará (Santarém and Juruti) and Amazonas (Humaitá).

Diagnosis. Resembles M. argentina  and M. borellii  in having Free tergite III with one higher central tubercle ( Figs 1View FIGURE 1 B, C; 2C) and tibia IV small-tuberculated ( Figs 7View FIGURE 7 B, C; 8C); it is similar to M. argentina  in having Femur IV with only small tubercles ( Figs 5View FIGURE 5 B; 6C) ( M. borellii  has an apical tubercle on Femur IV, Fig. 5View FIGURE 5 C) and to M. borellii  in having only one retrolateral tubercle on cheliceral bulla ( Figs 1View FIGURE 1 C; 2C) ( M. argentina  has contiguous tubercles, Fig. 1View FIGURE 1 B). It diFFers From these species in having dorsal scutum shape elongate ( Fig. 2View FIGURE 2 C) ( M. argentina  and M. borellii  have Flattened bodies, Figs 1View FIGURE 1 B, C), only one prolateral tubercle on coxa II ( Fig. 2View FIGURE 2 C) ( M. argentina  and M. borellii  also have one retrolateral tubercle, Figs 1View FIGURE 1 B, C), trochanter IV with retrolateral small tubercles ( Fig. 6View FIGURE 6 H) ( M. argentina  have agglomerated tubercles and M. borellii  has one basal and one apical tubercle, Figs 5View FIGURE 5 F, G), convex distal border oF ventral plate oF penis ( Fig. 12View FIGURE 12 I) ( M. argentina  and M. borellii  have a concave border, Figs 11View FIGURE 11 C, F).

Redescription. Male holotype (SMF 1491/13)

Measurements: dorsal scutum, total length 4.35; dorsal scutum, total width 3.5; prosoma length 1.25; prosoma width 2.15; Femur I length 2.3; Femur II length 4.6; Femur III length 3.6; Femur IV length 4.85; pedipalpal Femur length 1.2 mm.

Coloration in ethanol: Entirely pale brown.

Dorsum ( Fig. 2View FIGURE 2 C): Anterior margin oF dorsal scutum with median portion smooth, with two high rhomboid tubercles, near paracheliceral projections. Lateral margins oF dorsal scutum with rounded tubercles, near areas I – IV. Ocularium with shallow median depression, with 15 small tubercles. Posterior margin oF dorsal scutum with a row oF 18 tubercles. Free tergite I with row oF 20 tubercles, II with row oF 16 tubercles, III with row oF 12 tubercles, the central tubercle being the highest. Anal operculum with 39 rounded tubercles irregularly scattered. All tubercles oF posterior margin oF dorsal scutum, Free tergites and anal operculum have rounded apex.

Chelicera ( Fig. 2View FIGURE 2 C): Bulla with Four –Five tubercles on proximal margin, the last one on prolateral region. One apical retrolateral tubercle surrounded by smaller ones. Segment II with Five teeth; segment III with eight teeth, Four oF them larger.

Pedipalps ( MNRJ 8266) ( Fig. 3View FIGURE 3 F): Trochanter with two united ventral setiFerous tubercles. Femur with Four dorsal basal setiFerous tubercles Fused at the base; prolateral row oF Five setiFerous tubercles From median region to apex; six ventral rounded tubercles, the three median ones the highest, and two ventroapical tubercles. Tibia with a rounded projection on prolateral apical region, dorsal and ventral setae, one tubercle on each lateral dorsoapical region, and one retrolateral apical spine. Tarsus triangular with dorsal setae, the retrolateral inner row with two apical macrosetae and one central row oF six macrosetae.

Legs ( Figs 2View FIGURE 2 C; 6C, H; 8C, H): Coxa I with one FalciForm prolateral tubercle reaching the apex oF coxa and one smaller retrobasal tubercle. Coxae II –III with one prolateral high tubercle. Coxa IV with apical region visible in dorsal view, tuberculated, with one dorsal proapical apophysis. Trochanter IV with seven retrolateral small tubercles on the middle and one higher apical tubercle. Femur IV straight, with small tubercles in rows. Patella IV tuberculated. Tibia IV elongated with setiFerous small tubercles. Tarsal Formula: 5 / 8 / 5 / 6.

Penis ( MNRJ 4602) (Figs: 12G –I): Truncus straight and wide. Ventral plate thick, narrower at the middle; lateral borders, distal margin and region between the lateral borders strongly convex, with Four pairs oF lateroventral small macrosetae (macrosetae E). Lateral membranous expansions weak, From glans base to subapical region oF ventral plate (only visible in lateral view). Six lateral long macrosetae, three apical pairs (group C), one pair displaced ventrally (group B), one pair on median region (group D) and one pair on proximal region (group A). Insertion oF glans on basal portion oF ventral plate. Glans wide, much narrower at stylus base. Stylus short, with small projections on apex.

Female (MNRJ 8266).

Measurements: ( MNRJ 8266): dorsal scutum, total length 4.2; dorsal scutum, total width 3.5; prosoma length 1.2; prosoma width 2.0; Femur I length 2.2; Femur II length 5.0; Femur III length 3.7; Femur IV length 4.5; pedipalpal Femur length 1.0 mm.

Dorsum: Anterior constriction oF scutum well-marked. Posterior margin oF dorsal scutum with a row oF 21 tubercles with rounded apex. Free tergite I with row oF 18 tubercles, II with row oF 17 tubercles, III with row oF 15 tubercles, all similar sized. Anal operculum with 23 rounded tubercles irregularly scattered. Chelicera: Bulla with six proximal rounded tubercles. Pedipalps: Femur with small projection on dorsobasal region with Five small tubercles and Four dorsoapical tubercles; ventral row oF seven tubercles. Leg IV: Entirely with small tubercles. Tarsal Formula: 5 / 8 / 5 / 6.

Variation. Ocularium with 11–14 tubercles. The median tubercles oF Free tergite III can be Fused at base (three tubercles), these tubercles being the highest. Measurements ♂ (n=3): dorsal scutum, total length 8.7–9.2; dorsal scutum, total width 7.5–7.6; prosoma length 1.2–1.3; prosoma width 2.0–2.2; Femur I length 2.2–2.6; Femur II length 4.5–5.2; Femur III length 3.4–4.2; Femur IV length 4.4–5.5; pedipalpal Femur length 0.9–1.1 mm. Measurements ♀ (n=3): dorsal scutum, total length 3.9–4.0; dorsal scutum, total width 3.1–3.5; prosoma length 1.2–1.3; prosoma width 1.9–2.0; Femur I length 2.2–2.7; Femur II length 4.1–4.5; Femur III length 3.4–3.5; Femur IV length 3.8–4.5; pedipalpal Femur length 1.0. Tarsal Formula ♂ (n=3) 5/ 5– 10/ 5/ 5–6. Tarsal Formula ♀ (n=3) 5/ 5–8/ 5/ 6.

Material examined. BRAZIL. Pará State, Juruti , 02° 24’ 33”S 56° 26’ 10” W, 02–20. IX.2002, A. Bonaldo et al. leg., 1♂ ( MPEG JUR- 01 370)GoogleMaps  ; Amazonas State, Humaitá , 07° 30' 22" S 63° 01' 15" W, 26.II.1976, U. Caramaschi leg., 32♂ 68♀ ( MNRJ 8266View Materials), same loc.GoogleMaps  , 17.I.1979, U. Caramaschi leg., 1♂ (MNRJ 4602).


Museu Nacional/Universidade Federal de Rio de Janeiro


Museu Paraense Emilio Goeldi














Metalibitia santaremis ( Roewer, 1947 )

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

Metalibitia santaremis

Kury 2003: 69
Ringuelet 1959: 425

Paralibitia santaremis

Roewer 1947: 8