Lautaria ceachei, 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

Lautaria ceachei sp. nov.

Figs 62 , 63 , 64 , 65 , 66 , 67

Material examined.

Holotype. ♂ Chile. Altos del Lircay RN, E Vilches Alto , 35.5987 ° S, 71.04097 ° W, 1380 m, M. Ramírez, A. Ojanguren, A. Pérez-González, G. Azevedo, W. Porto coll. ( MNHNCL) . Paratypes. Chile. Altos del Lircay RN, E Vilches Alto , 35.5987 ° S, 71.04097 ° W, 1380 m, M. Ramírez, A. Ojanguren, A. Pérez-González, G. Azevedo, W. Porto coll. 15. I. 2018, 1 ♂ 4 ♀, 2 imm. ( MACN) .

Etymology.

The specific epithet “ ceachei ” is derived from the chanted cry “ ceacheí, ” commonly used during sporting events to cheer on Chilean representatives. This Chileanism is created by combining the initial letters of the word “ Chile. ” The epithet serves as noun in apposition, highlighting the connection to Chilean representation and support.

Description of male.

Measurements: Total length 2.49. Carapace length 1.14, dorsal scutum length 2.20, carapace max. width 1.63, mesotergum max. width 2.45. Appendage measurements: Pedipalps. Trochanter length 0.30, femora length 0.90, patella length 0.60, tibia length 0.71, tarsus length 0.70. Leg I: trochanter (tr) 0.27, femora (fe) 0.95, patella (pa) 0.54, tibia (ti) 0.83, metatarsus (mt) 1.08, tarsus (ta) 0.61 II: tr 0.32, fe 1.42, pa 0.61, ti 1.10, mt 1.36, ta 0.61. III: tr 0.38, fe 0.95, pa 0.54, ti 0.81, mt 1.02, ta 0.73. IV: tr 0.39, fe 1.41, pa 0.73, ti 1.16, mt 1.49, ta 0.87.

Dorsum (Fig. 62 , 63 ). Eta (η) hourglass-shaped dorsal scutum, characterized by its distinctive form. Ocularium low and rounded, with an acute small apophysis. Both the dorsal scutum and free tergites covered with microgranulation, providing a textured surface. Mesotergal areas without clear separation but with small setiferous tubercles, with a stronger presence in the mesotergum and free tergites.

Chelicerae (Fig. 64 A, B ). Segment I of with a sharp spine on the dorso-distal surface, with three small ventral-proximal tubercles. Segment II with scattered setae in both ectal and ventral views, and in front view, with a triangular tubercle that stands out from the others.

Pedipalps (Fig. 64 C, D ). Trochanter with a small dorsal and a ventral tubercle. Femora with two parallel rows of dorso-mesal tubercles, with three ventral spines and a few setiferous tubercles. Patella with a mesal tubercle. Tibia with three ventral-ectal spines, two ventral-mesal spines, and small scattered ventral tubercles.

Legs (Fig. 65 ). Coxa I characterized by having 9–10 setiferous tubercles, the two apical ones being stronger and more prominent than the others. Coxa II with a higher number of setiferous tubercles, ranging from 20 to 25. Coxa III with 12–14 tubercles, while coxa IV has five or six small tubercles. Spiracles not obstructed. A smooth surface covers ~ 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 the calcaneus on all legs. Tarsal count: 3–6 – 4 – 4.

Penis (Figs 66 , 67 ). Pars distalis with a ventral plate and a small cleft, dividing it into two lamellae. Each lamella with three pointed macrosetae on the ventral surface and one macroseta on the dorsal surface. Capsula externa lower than the capsula interna, with a notch in the apical part, dividing into two lateral apical “ wings ”. With an additional dorsolateral plate. Capsula interna thin and laterally flattened, with a sharp apical area.

Female. Similar to male but with shorter pedipalpal femora and a reduced interocular process.

Female measurements: Total length 2.98. Carapace length 1.11, dorsal scutum length 2.39, carapace max. width 1.66, mesotergum max. width 2.46. Appendage measurements: Pedipalps. Trochanter length 0.33, femora length 1.09, patella length 0.53, tibia length 0.81, tarsus length 1.05. Leg I: trochanter (tr) 0.22, femora (fe) 1.09, patella (pa) 0.50, tibia (ti) 0.86, metatarsus (mt) 1.06, tarsus (ta) 0.63 II: tr 0.24, fe 1.42, pa 0.60, ti 1.12, mt 1.35, ta 1.17. III: tr 0.27, fe 1.06, pa 0.47, ti 0.86, mt 1.01, ta 0.62. IV: tr 0.37, fe 1.43, pa 0.72, ti 1.16, mt 1.42, ta 0.85.

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 62. Lautaria ceachei 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 63. Lautaria ceachei sp. nov. male, SEM images of habitus A dorsal view B lateral view C, D ventral view. Scale bars: 1 mm (A, B, C); 500 µm (D).

Figure 64. Lautaria ceachei sp. nov. chelicerae: mesal A ectal B Pedipalps: mesal C ectal D. Scale bars: 200 µm (A, B); 500 µm (C, D).

Figure 65. Lautaria ceachei sp. nov. legs I A II B III C IV D. Scale bars: 500 µm.

Figure 66. Lautaria ceachei 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 67. Lautaria ceachei sp. nov. penis: ventral A apical B lateral C dorsal D. Colors: ventral plate (yellow), capsula externa (blue), capsula interna (red). Scale bars: 1 mm.