Nerudiella pichi, 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 pichi sp. nov.

Figs 128 , 129 , 130 , 131 , 132 , 133

Material examined.

Holotype. ♂ Chile. Choapa: Pichidangui, Valparaíso, Cerro La Silla del Gobernador , E. Maury coll. 30. X. 1988 ( MNHNCL) . Paratypes. Chile. Choapa: Pichidangui, Valparaíso, Quebrada near Puente Totoralillo , 13. XI. 1987, E. Maury coll. 1 ♂ ( MACN) . Los Vilos, Cuesta Caviolén , E. Maury, 12. XI. 1987 1 ♂ 2 ♀ ( MACN) . Valparaíso, 10 km S de Casablanca , E. Maury, 13. I. 1984 2 ♀ ( MACN) . Pichidangui, Valparaíso, Quebrada near Puente Totoralillo , E. Maury coll. 13. XI. 1987, 7 ♂ 1 ♀ ( MACN) . Valparaíso: Quebrada El Tigre 25 km E Zapallar , M. Ramírez, J. Pizarro coll., 12. II. 2011, 1 ♀ ( MACN) .

Etymology.

The specific epithet refers to “ Pichí ” which comes from Mapudungun, the language of the Mapuche (original people of the region), meaning small. Noun in apposition.

Diagnosis.

This species can be distinguished from the other species of the genus by having the dorsal microgranulate; Femora and tibia of the pedipalp with small tubercles. The male genitalia have a reduced ventral plate, a very long capsula interna and capsula externa, as well as a long fine structure at the apex of the capsula interna.

Distribution.

Chile: Valparaíso Region.

Description of male holotype.

Measurements: Total length 2.65, carapace length 1.12, dorsal scutum length 2.21, carapace max. width 1.64, mesotergum max. width 2.02. Appendage measurements: Pedipalps. Trochanter length 0.28, femora length 1.12, patella length 0.73, tibia length 0.77, tarsus length 0.80. Leg I: trochanter (tr) 0.20, femora (fe) 1.00, patella (pa) 0.52, tibia (ti) 0.73, metatarsus (mt) 0.90, tarsus (ta) 0.77. II: tr 0.27, fe 1.37, pa 0.63, ti 1.03, mt 1.14, ta 1.36. III: tr 0.27, fe 0.87, pa 0.40, ti 0.71, mt 0.90, ta 0.76. IV: tr 0.35, fe 1.29, pa 0.65, ti 1.05, mt 1.32, ta 0.86.

Dorsum (Fig. 128 , 129 ). Eta (η) hourglass-shaped dorsal scutum. Low ocularium. Dorsal scutum microgranulate, without clear delimitation of areas. The microgranulation and the setiferous tubercles are almost the same size, so it is difficult to delimit the rows of tubercles that are present in the dorsal scute and free tergites.

Chelicerae (Fig. 130 A, B ). Segment I with a small tubercle on the dorso-distal surface. Segment II bearing scant setae.

Pedipalps (Fig. 130 C, D ). Trochanter with a small dorsal and ectal tubercle. Femora bearing an ectal row of setiferous tubercles; dorsal surface with a row of spines and a parallel row of setiferous granules on each side. Patella with a ventral setiferous tubercle, dorsal surface covered with setae. Tibia covered in setiferous granules, with three ectal and mesal spines with subdistal setae on each side. Tarsus with three mesal and four ectal spines with subdistal setae and setae and scant granules.

Legs (Fig. 131 ). Coxa I with setiferous tubercles, the large one with subdistal setae, II with setiferous tubercles, III and IV only with the microgranulation, three bridges between legs II and III, three between III and IV, five between leg IV and opisthosoma. Spiracles not obstructed by bridges. Smooth surface occupying 1 / 3 of leg II, ¾ of leg III and <1 / 3 of leg IV. Sternum arrow-shaped. Legs covered in small tubercles, astragalus longer than calcaneus on all legs. Tarsal count: 3–5 – 4 – 4.

Penis (Figs 132 , 133 ). Pars distalis with a ventral plate reduced in its apical portion bearing a cleft that divides the plate into two halves. Each half has three pointed macrosetae on the ventral surface and one macroseta on the dorsal surface; capsula externa covering dorsal and lateral surfaces, having a very long cleft dividing the capsula interna into two halves, including two rounded, microsculpted processes; there is a dorsolateral plate attached to the pars basalis. Capsula interna longer than the capsula externa, the apical portion is long and thin.

Female. Similar to male, with shorter pedipalpal femora.

Female measurements. Total length 2.49, carapace length 1.00, dorsal scutum length 2.15, carapace max. width 1.54, mesotergum max. width 2.10. Appendage measurements: Pedipalps. Trochanter length 0.25, femora length 0.89, patella length 0.53, tibia length 0.56, tarsus length 0.67. Leg I: trochanter (tr) 0.24, femora (fe) 0.89, patella (pa) 0.48, tibia (ti) 0.62, metatarsus (mt) 0.82, tarsus (ta) 0.57. II: tr 0.28, fe 1.17, pa 0.45, ti 0.90, mt 1.06, ta 1.14. III: tr 0.30, fe 0.80, pa 0.38, ti 0.63, mt 0.80, ta 0.67. IV: tr 0.33, fe 1.17, pa 0.55, ti 0.96, mt 1.11, ta 0.80.

Figures

Figure 128. Nerudiella pichi 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 129. Nerudiella pichi sp. nov. male, SEM images of habitus A dorsal view B lateral view C, D ventral view. Scale bars: 500 µm.

Figure 130. Nerudiella pichi sp. nov. chelicerae: mesal A ectal B pedipalps: mesal C ectal D. Scale bars: 200 µm (A, B); 500 µm (C, D).

Figure 131. Nerudiella pichi sp. nov. legs I A II B III C IV D. Scale bars: 200 µm (A, C); 500 µm (B, D).

Figure 132. Nerudiella pichi sp. nov. penis: ventral A, B apical C lateral D, E dorsal F, G. Scale bars: 200 µm (A, D, F); 100 µm (B, E, G); 50 µm (C).

Figure 133. Nerudiella pichi sp. nov. penis: ventral A apical B lateral C dorsal D. Colors: ventral plate (yellow), capsula externa (blue), capsula interna (red). Scale bars: 100 µm (A, C, D); 50 µm (B).