Metasarcus vacafloresae, Benedetti & Pinto-da-Rocha, 2022

Benedetti, Alipio Rezende & Pinto-da-Rocha, Ricardo, 2022, Systematic revision and total evidence phylogenetic analysis of the Andean family Metasarcidae Kury, 1994 (Opiliones: Laniatores), with description of two new genera and twenty new species, Arthropod Systematics & amp; Phylogeny 80, pp. 309-388 : 309

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Metasarcus vacafloresae

sp. nov.

3.48. Metasarcus vacafloresae sp. nov.

Figs 5I View Figure 5 , 10O, P View Figure 10 , 20D-F View Figure 20 , 26E, F View Figure 26 , 31 View Figure 31


MALE: Measurements (n=4) DSW: 4.2-4.9 (4.7); DSL: 5.1-5.4 (5.4); CL: 2.1-2.5 (2.5). FIVL: 13.0-14.2 (14.2). ChL: 2.9-4.2 (3.6). Coloration: (Fig. 26E View Figure 26 ) Orange brown. Brown spots on the carapace and on the lateral margins of DS. Free tergites I-III and anal operculum dark brown. Reddish brown legs, except for the coxae and trochanters, in a lighter shade of orange brown. Dorsum: (Fig. 5I View Figure 5 ) Kappa-type DSS, with straight posterior margin of DS; constriction II present, coda long. Anterior margin of the carapace with median elevation, with few granules. Ocularium with very subtle median depression, almost inconspicuous. Carapace with sparse granules. DS with four areas covered by few granules, unarmed. Area I undivided. Lateral margins of DS with rows of granules in greater density than in the dorsal areas of the DS and carapace. Posterior margin of DS and free tergites I-III unarmed and with few granules. Chelicerae: (Fig. 5I View Figure 5 ) Swollen in large males (as in the holotype), similar to females in the small males. Segment I with sparse small granules. Segment II smooth, swollen in some males, finger with one tooth. Segment III with two teeth. Pedipalpus : Sparse granules throughout the appendage, less numerous on the ventral surfaces. Coxa with a small retrobasal tubercle. Trochanter with two ventroapical setiferous tubercles, the apical one being smaller. Femur with a row of five ventral setiferous tubercles, two more basal and three median and a proapical spine. Patella smooth. Tibia: prolateral iIiIIi, retrolateral IIii. Tarsus: prolateral iiIiIii, retrolateral iIiIi. Venter: Coxa I with a median row of five setiferous tubercles, a parallel row of small tubercles and scattered granules. Coxa II covered with sparse granules; with an apical row of two-three setiferous tubercles. Coxa III with a proventral row of five tubercles and a retroventral row of eight. Coxa IV with sparse granules. Smooth genital area. Free sternites and anal operculum with few granules. Legs: (Figs 5I View Figure 5 , 10O, P View Figure 10 ) Coxa I with a retrolateral apophysis. Coxa II with one prolateral and two retrolateral apophyses. Coxa III unarmed. Coxa IV with sparse small granules. Trochanters with sparse granules. Femora I-IV straight, unarmed and with granules. Tarsal formula: (n =4) 8, 17-18 (18), 10-11 (10), 12-13 (13). Penis: (Fig. 20D-F View Figure 20 ) VP subrectangular, long, with apex narrower than the base; convex distal margin; curved in lateral view. MS C1-C3 subdistal long and straight (or slightly curved); MS A1 sub basal long and straight (slightly shorter than MS C); MS B1 basal (near lateral sacs) long and straight (or apically curved); MS D1 short and straight, medially placed; MS E1-E2 very short, ventrally placed (MS E1 between MS C2 and MS C3; MS E2 near MS D1). Lateral sacs long and tapered; with long T3-like microsetae. Stylus with wide apex and projections. Dorsal process long and apically tapered. Promontory convex. - FEMALE: Measurements (n =5) DSW: 4.1-4.5; DSL: 5.0-5.7; CL: 2.1-2.3. FIVL: 12.7-14.6. ChL: 2.3-2.6. (Fig. 26F View Figure 26 ) Chelicerae smaller than in males. Tarsal segmentation: (n =5) 7-8, 14-16, 10-11, 11-13.


It differs from other species of the genus by the following set of characteristics: alpha type DSS; scutal area I undivided; areas I-IV unarmed (Fig. 5I View Figure 5 ); male femur IV unarmed (Fig. 10O, P View Figure 10 ); body orange brown (Fig. 26E View Figure 26 ); VP subrectangular and long; dorsal process present (Fig. 20D-F View Figure 20 ).

Derivatio nominis.

The specific epithet of feminine gender, in the genitive form, in honor to Maria René Vacaflores, from Coleccíon Boliviana de Fauna (CBF), who provided invaluable help with all formalities for collecting in Bolivia.


(Fig. 31 View Figure 31 ) BOLIVIA. La Paz. Zongo.

Material examined.

Type material: Holotype ♂, ' BOLIVIA, La Paz, Zongo , 16°10′32.4″S 68°08′11.9″W, 10/XII/2010, R. Pinto-da-Rocha, A. Benedetti, J. Ochoa & A. Saravia leg. (CBF) GoogleMaps - Paratypes 2 ♂, 5 ♀, ‘ditto’ (CBF); Paratypes 4 ♂, 6 ♀, ‘ditto’ (MZSP 36998).