Nerudiella cachai, 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 cachai sp. nov.

Figs 74 , 75 , 76 , 77 , 78 , 79

Material examined.

Holotype. ♂ Chile. Concepción: Estero Nonguén , 36.82106 ° S, 73.01649 ° W, T. Cekalovic coll., 21. IV. 1976 ( MNHNCL) . Paratypes. Chile. Concepción: Estero Nonguén , T. Cekalovic coll., 13. III. 1977, 7 ♂ 2 ♀ ( MACN) . Same locality, T. Cekalovic coll., 16. IV. 1977, 1 ♀ 1 imm. ( MACN) . Same locality, 1250 m, N. Platnick, R. Schuh coll., 19. 11. 1981, 2 ♂ 1 imm. ( AMNH) . Agua de la Gloria , T. Cekalovic coll., 14. VIII. 1978, 1 ♂ ( MACN) .

Additional material.

Chile. Arauco. Caramávida, San Alfonso, Quebrada Caramávida, San Alfonso, Arauco reserve, 37.70942 ° S, 73.17107 ° W, 750 m, A. Ojanguren, P. Goloboff, M. Ramírez, G. Azevedo, W. Porto coll., 15. I. 2018, 30 imm. ( MACN). 16 km N Tres Pinos, 37.54143 ° S, 73.41555 ° W, A. Newton, M. Thayer coll., 12. XII. 1982, 2 ♂ ( AMNH). Concepción. Penco, 36.734 ° S, 72.98006 ° W, T. Cekalovic coll., 23. IV. 1977, 5 ♂ 5 ♀ 2 imm. ( MACN). Cerro Caracol, 36.83465 ° S, 73.0488 ° W, T. Cekalovic coll., 10. IV. 1977, 6 ♂ 1 ♀ ( MACN). Estero Nonguén, 36.82096 ° S, 73.0164 ° W, T. Cekalovic coll., 03. XII. 1982, 11 imm. ( MACN). Esquadrón, 36.9824 ° S, 73.14165 ° W, T. Cekalovic coll., 10. 08. 1978, 1 imm. ( MACN). Estero Nonguén, 36.82096 ° S, 73.0164 ° W, T. Cekalovic coll., 19. VIII. 1978, 2 imm. ( MACN). El Manzano, Camino de Santa Juana, 36.86677 ° S, 72.78498 ° W, T. Cekalovic coll., 13. I. 1985, 1 ♂ ( MACN). Colcura, 37.11386 ° S, 73.14724 ° W, T. Cekalovic coll., 30. I. 1985, 1 imm. ( MACN). Hualpén, Terrestrial Biology Station Univ. de Concepción, 36.79821 ° S, 73.16307 ° W, 52 m, A. Ojanguren, A. Pérez-González, M. Ramírez, G. Azevedo, W. Porto coll., 14. I. 2018, 1 ♀ 3 mm ( MACN). Estero Nonguén, 36.82129 ° S, 73.0164 ° W, N. Platnick, R. Schuh coll., 16. XI. 1981, 6 ♂ 2 ♀ 6 imm. ( AMNH). 8.4 km W La Florida, 36.84976 ° S, 72.78826 ° W, 170 m, A. Newton, M. Thayer coll., 02. I. 1983, 3 ♀ ( AMNH). Dichoco. Estero Bellavista, 36.71992 ° S, 72.91118 ° W, T. Cekalovic coll., 04. I. 1984, 2 ♂ 4 ♀ 4 imm. ( MACN). 6 km S San Pedro, 36.90616 ° S, 73.10894 ° W, N. Platnick, O. Francke coll., 22. I. 1985, 2 ♂ 2 imm. ( AMNH). Dichoco. Estero Bellavista, 36.71992 ° S, 72.91118 ° W, T. Cekalovic coll., 04. I. 1984, 1 ♀ 1 imm. ( MACN). Parque Nacional Nahuelbuta, T. Cekalovic coll., 19. XI. 1981, 2 ♂ 1 ♀ ( MACN). Estero Nonguén, 36.82096 ° S, 73.0164 ° W, T. Cekalovic coll., 03. XI. 1982, 1 ♂ 4 imm. ( MACN).

Etymology.

The specific epithet cachai refers to a popular expression in Chile that is roughly translated to “ you know what I mean? ” “ am I right? ”, or “ get it? ”. It is derived from the English term “ to catch, ” which refers to catching but is also used to mean “ understanding or understanding something. ” Noun in apposition.

Diagnosis.

This species can be easily distinguished from other species of the genus by its male genitalia, which exhibits a highly reduced ventral plate, with a stylus that is formed by a thin and slender tube.

Distribution.

Chile: Bío-Bío Region.

Description of male holotype.

Measurements: Total length 2.26, carapace length 0.92, dorsal scutum length 1.84, carapace max. width 1.23, mesotergum max. width 1.70. Appendage measurements: Pedipalps. Trochanter length 0.23, femora length 0.91, patella length 0.44, tibia length 0.68, tarsus length 0.59. Leg I: trochanter (tr) 0.22, femora (fe) 1.10, patella (pa) 0.51, tibia (ti) 0.79, metatarsus (mt) 0.92, tarsus (ta) 0.92. II: tr 0.27, fe 1.33, pa 0.57, ti 1.00, mt 1.22, ta 1.45. III: tr 0.21, fe 0.91, pa 0.31, ti 0.73, mt 0.75, ta 0.74. IV: tr 0.32, fe 1.29, pa 0.59, ti 1.04, mt 1.30, ta 0.86.

Dorsum (Fig. 74 , 75 ). Eta (η) dorsal scutum in the shape of an hourglass. Ocularium low. Dorsal scutum microgranulate, with no clear delimitation of distinct areas. Areas III and IV with irregular rows of small rounded setiferous tubercles; posterior margin with a similar irregular row of small rounded setiferous tubercles. All free tergites covered in small setae and with a row of small rounded setiferous tubercles.

Chelicerae (Fig. 76 A, B ). Segment I with a small tubercle on its dorso-distal surface. Segment II with a small frontal tubercle and scattered setae.

Pedipalps (Fig. 76 C, D ). Trochanter characterized by the presence of two small dorsal tubercles and one ventral tubercle. In dorsal view, femora with three spines with subdistal setae; in ventral view, with five tubercles with subdistal setae, with four mesal setiferous tubercles and one ectal setiferous tubercle positioned beneath. Patella with both mesal and ectal setiferous tubercles. Tibia with three ectal and two mesal spines with subdistal setae. Tarsus with three mesal and ectal spines, accompanied by scattered setae.

Legs (Fig. 77 ). Segments I and II with two rows of setiferous tubercles; segments III and IV microgranulate but without setiferous tubercles. With three bridges connecting legs II and III, six bridges between III and IV, and four bridges between leg IV and the opisthosoma. Distal bridge longer than the others. The bridges do not obstruct the spiracles. The smooth area occupies ~ ¼ of leg II, ¾ of leg III, and <1 / 3 of leg IV. Sternum arrow-shaped, with a triangular-shaped posterior margin. Legs I – IV covered with setae, the area of the tarsus and calcaneus are densely setose. Femora I – IV with a ventral row of setiferous granules. Calcaneus smaller than astragalus, ≥ 3 × smaller (legs I, III) of the same size (II) and 4 × smaller (leg IV). Tarsal count: 3–6 – 4 – 4.

Penis (Figs 78 , 79 ). Pars distalis with a small ventral plate divided into two distinct small lamellae by a central cleft. Each lamella adorned with three pointed macrosetae on its ventral surface, with a single macroseta on its dorsal surface. Additionally, there is a capsula externa, characterized by its square shape, which covers the dorsal and lateral surfaces. Attached to the pars basalis is a dorsolateral plate. The capsula interna, longer in length compared to the capsula externa, partially overlays the ventral plate. Apex of the capsula interna with a tubular stylus.

Female. Pedipalp femora noticeably smaller than those of males.

Female measurements. Total length 2.30, carapace length 0.87, dorsal scutum length 1.85, carapace max. width 1.24, mesotergum max. width 1.75. Appendage Measurements: Pedipalps. Trochanter length 0.17, femora length 0.72, patella length 0.35, tibia length 0.54, tarsus length 0.57. Leg I: trochanter (tr) 0.22, femora (fe) 0.73, patella (pa) 0.43, tibia (ti) 0.53, metatarsus (mt) 0.65, tarsus (ta) 0.60. II: tr 0.28, fe 0.97, pa 0.49, ti 0.75, mt 0.82, ta 1.02. III: tr 0.22, fe 0.61, pa 0.38, ti 0.53, mt 0.57, ta 0.56. IV: tr 0.34, fe 0.90, pa 0.55, ti 0.76, mt 0.91, ta 0.75.

Figures

Figure 3. Phylogenetics relationships of Triaenonychidae, with clade names as discussed in the main text. Phylogeny is derived from the IQ-TREE analysis. Nodes without circles have < 95 % bootstrap support to AH-aLR and UFBoot.

Figure 74. Nerudiella cachai 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: 500 µm. Species of Clade C, see Fig. 3

Figure 75. Nerudiella cachai sp. nov. male, SEM images of habitus A dorsal view B lateral view C, D ventral view. Scale bars: 500 µm (A, B, C); 200 µm (D).

Figure 76. Nerudiella cachai sp. nov. chelicerae: mesal A ectal B pedipalps: mesal C ectal D. Scale bars: 200 µm.

Figure 77. Nerudiella cachai sp. nov. legs I A II B III C IV D. Scale bars: 200 µm.

Figure 78. Nerudiella cachai 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 79. Nerudiella cachai 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.