Nerudiella penco, Porto & Derkarabetian & Giribet & Pérez-González, 2024

Porto, Willians, Derkarabetian, Shahan, Giribet, Gonzalo & Pérez-González, Abel, 2024, Systematic revision of the South American “ Nuncia ” (Opiliones, Laniatores, Triaenonychidae), ZooKeys 1207, pp. 1-149 : 1-149

Nerudiella penco sp. nov.

Figs 122 , 123 , 124 , 125 , 126 , 127

Material examined.

Holotype. ♂ Chile. Concepción: Estero Nonguén , N. Platnick, R. Schuh coll., 16. XI. 1981 ( AMNH) . Paratypes. Chile. Concepción: Penco , T. Cekalovic coll., 11. II. 1979, 1 ♀ ( AMNH) .

Etymology.

The specific epithet refers to the type locality of the species, the commune of Penco, located in the province of Concepción, Chile. Noun in apposition.

Diagnosis.

This species can be distinguished from the other species in the genus by having the dorsal scutum without tubercles. The male genitalia has longer macrosetae than other species of the genus, capsula externa divided into two halves that touch in the apical portion, leaving a gap between the two halves.

Distribution.

Chile: Bío-Bío Region (Fig. 4 F ).

Description of male holotype.

Measurements: Total length 3.67. Carapace length 0.97, dorsal scutum length 1.90, carapace max. width 1.26, mesotergum max. width 1.55. Appendage measurements: Pedipalps. Trochanter length 0.24, femora length 0.98, patella length 0.53, tibia length 0.70, tarsus length 0.71. Leg I: trochanter (tr) 0.19, femora (fe) 0.85, patella (pa) 0.46, tibia (ti) 0.60, metatarsus (mt) 0.70, tarsus (ta) 0.63. II: tr 0.25, fe 1.17, pa 0.56, ti 0.83, mt 0.99, ta 1.27. III: tr 0.26, fe 0.77, pa 0.32, ti 0.55, mt 0.57, ta 0.71. IV: tr 0.30, fe 1.07, pa 0.55, ti 0.85, mt 1.04, ta 0.89.

Dorsum (Fig. 122 , 123 ). Eta (η) hourglass-shaped dorsal scutum. Ocularium low. Dorsal scutum microgranulate, without clear delimitation of areas. Areas III – IV smooth, with few setae; posterior margin with a row of setae. Free tergites have a row of setae.

Chelicerae (Fig. 124 A, B ). Segment I with a small tubercle on the dorsal-distal surface. Segment II with a mesal tubercle and bearing few setae.

Pedipalps (Fig. 124 C, D ). Trochanter with a small dorsal and ectal tubercle. Femora with a row of three spines and one setiferous granule on the ventral surface, three small dorsal spines with subdistal setae, and three meso-distal setiferous granules. Patella with 1–2 ventral setiferous granules. Tibia with three ectal and mesal spines with subdistal setae; presence of scant granules in ventral view. Tarsus with an ectal row of two subdistal setiferous spines and 6–8 small setiferous tubercles, there are three spines with subdistal setae on the mesal surface.

Legs (Fig. 125 ). Coxae I and II covered in setiferous tubercles, III and IV only with the microgranulation, bearing three bridges between legs II and III, five or six between III and IV, four between leg IV and the opisthosoma (the longest being the most distal). Spiracles not obstructed by bridges. Smooth area occupying 1 / 3 of leg II (with two small tubercles and two rounded tubercles), 2 / 3 of III and <1 / 3 of IV. Sternum arrow-shaped. Legs covered in small tubercles, astragalus longer than calcaneus on all legs. Tarsal count: 3–6 – 4 – 4.

Penis (Figs 126 , 127 ). Pars distalis with a large ventral plate bearing a cleft that divides the plate into two lamellae. Each lamella has three long pointed macrosetae on the ventral surface and one macroseta on the dorsal surface; capsula externa covering dorsal and lateral surfaces, having a cleft dividing the capsula externa into two halves; there is a dorsolateral plate attached to the pars basalis. Capsula interna longer than the capsula externa, partially covering the ventral plate, with a visible stylus in its apical portion.

Female. Similar to males, with shorter pedipalpal femora.

Female measurements. Total length 4.06, carapace length 1.12, dorsal scutum length 2.16, carapace max. width 1.46, mesotergum max. width 2.04. Appendage Measurements: Pedipalps. Trochanter length 0.27, femora length 0.97, patella length 0.51, tibia length 0.68, tarsus length 0.82. Leg I: trochanter (tr) 0.27, femora (fe) 0.99, patella (pa) 0.50, tibia (ti) 0.73, metatarsus (mt) 0.81, tarsus (ta) 0.73. II: tr 0.30, fe 1.15, pa 0.65, ti 0.82, mt 1.00, ta 1.00. III: tr 0.24, fe 0.81, pa 0.45, ti 0.60, mt 0.68, ta 0.77. IV: tr 0.36, fe 1.24, pa 0.69, ti 1.04, mt 1.26, ta 1.20.

Figures

Figure 4. Maps showing the distribution of the species used in this work. South America (Chile and western Argentina inset). Chile in green, Argentina / South America in grey. Terrestrial ecoregions (following Olson et al. 2001) highlighted in yellow (Chilean Matorral) and orange (Valdivian temperate forests).

Figure 122. Nerudiella penco sp. nov. habitus, male A dorsal view C lateral view E ventral view. Female B dorsal view D lateral view F ventral view. Scale bars: 1 mm.

Figure 123. Nerudiella penco sp. nov. male, SEM images of habitus A dorsal view B lateral view C, D ventral view. Scale bars: 500 µm.

Figure 124. Nerudiella penco sp. nov. chelicerae: mesal A ectal B pedipalps: mesal C ectal D. Scale bars: 200 µm.

Figure 125. Nerudiella penco sp. nov. legs I A II B III C IV D. Scale bars: 200 µm (A, C); 500 µm (B, D).

Figure 126. Nerudiella penco sp. nov. penis: ventral A, B apical C lateral D, E dorsal F, G. Scale bars: 200 µm (A, D, F); 50 µm (B, C, E, G).

Figure 127. Nerudiella penco sp. nov. penis: ventral A apical B lateral C dorsal D. Colors: ventral plate (yellow), capsula externa (blue), capsula interna (red). Scale bars: 50 µm.