Maurymontia brasiliana ( Maury, 1999 ), 2025

Porto, Willians, Iglesias, Patricia P. & Pérez-González, Abel, 2025, Disentangling the South American “ Ceratomontia ”: new genus, new combinations, and new species (Opiliones: Laniatores: Triaenonychidae), Zootaxa 5729 (2), pp. 233-263 : 241-244

Maurymontia brasiliana ( Maury, 1999) comb. nov.

( Figs 2A , 8–9 )

Ceratomontia sp. : Maury & Roig Alsina 1985: 88.

Ceratomontia brasiliana Maury 1999: 34 , figs 1–9; Kury 2003: 20. Type material. ♂ holotype ( PUCRS 0107 ) from Brazil, Rio Grande do Sul, São Francisco de Paula (examined) . ♂ paratype ( PUCRS 0108 ) same data (examined) . ♂ paratype (MACN-Ar 9466) (lost) same data . ♀ allotype (MACNAr 9467) from Brazil, Rio Grande do Sul, Parque Caracol, 8 km from Canela : M. J. Ramírez col., 24.VI.1994 (examined) . 2 ♂ paratype (MACN-Ar 9468) same data (examined).

Additional material examined. BRAZIL, Rio Grande do Sul, São Francisco de Paula, Potrero velho: Ricardo Ott col., 04-XI-2000 , 2 ind. ( PUCRS 326 ). Same data, 31-III-1997 , 8 ind. ( PUCRS 345 ). Same data, 22-IV-1997 , 2

ind. ( PUCRS 348 ) . Same data, 25-V-2000, 4 ind. ( PUCRS 351 ) . Same data, 21-VI-2000, 1 ind. ( PUCRS 354 ) . Same data, 31-XII-1998, 5 ind. ( PUCRS 363 ) .

Comparative diagnosis. This species is readily distinguishable from other members of the genus due to its short, rounded and minimally projected ocularium ( Fig. 8 ). The capsula interna of the penis is entirely covered by the capsula externa and the ventral plate is almost rectangular in shape ( Fig. 9 ).

Measurements paratype (MACN-Ar 9468): Total length 1.37; carapace length 0.61, maximum width 0.80; dorsal scutum length 1.16; mesotergal scute maximum width 1.06. Pedipalps: trochanter 0.13, femur 0.48, patella 0.25, tibia 0.45, tarsus 0.38. Leg I: trochanter 0.15, femur 0.48, patella 0.27, tibia 0.31, metatarsus 0.35, tarsus 0.41. Leg II: trochanter 0.18, femur 0.59, patella 0.31, tibia 0.50, metatarsus 0.43, tarsus 0.57. Leg III: trochanter 0.14, femur 0.47, patella 0.26, tibia 0.33, metatarsus 0.39, tarsus 0.35. Leg IV: trochanter 0.18, femur 0.59, patella 0.28, tibia 0.55, metatarsus 0.64, tarsus 0.42.

Redescription. Male paratype (MACN-Ar 9468). Dorsum ( Fig. 8 A, C ). Eta (η) hourglass-shaped dorsal scutum. Ocularium conical, with rounded tip, with the dorsal surface adorned with granules. Eyes are located in the middle of the ocularium. The dorsal scutum reveals well-defined areas covered by small tubercles. Free tergites are covered by small tubercles, some bearing setae.

Venter . Distal areas of the coxae II and IV with distal tubercles. Spiracles are visible. The sternum is arrow-shaped.

Chelicerae. Segment I–II with small tubercles.

Pedipalp ( Fig. 9 A ). Trochanter with two dorsal tubercles and one ventral tubercle with subdistal setae. Femur with a ventral-ectal tubercle and a dorsal row of tubercles with subdistal setae. Patella with small tubercles. Tibia and tarsus covered ventrally by granules, and three ventral mesal and ventral ectal tubercles with subdistal setae.

Legs. Leg I with a row of tubercles on the ventral femur. I–V covered by granules. Astragalus larger than the calcaneus on all legs, tarsal count: 2-3-3-3.

Penis ( Fig. 9 B–D ). Pars distalis with a ventral plate, without a cleft, forming a lamella, almost rectangular, bearing three ventral and two dorsal macrosetae each side; capsula externa higher than the ventral plate, surrounding the capsula interna; capsula interna tubular in shape, shorter than the capsula externa.

Female

Measurements female (MACN-Ar 9467): Total length 1.64; carapace length 0.58, maximum width 0.84; dorsal scutum length 1.45; mesotergum maximum width 1.23. Pedipalps: trochanter 0.13, femur 0.45, patella 0.25, tibia 0.37, tarsus 0.38. Leg I: trochanter 0.15, femur 0.52, patella 0.27, tibia 0.31, metatarsus 0.35, tarsus 0.39. Leg II: trochanter 0.16, femur 0.70, patella 0.34, tibia 0.48, metatarsus 0.44, tarsus 0.54. Leg III: trochanter 0.14, femur 0.48, patella 0.20, tibia 0.36, metatarsus 0.41, tarsus 0.38. Leg IV: trochanter 0.20, femur 0.59, patella 0.30, tibia 0.54, metatarsus 0.62, tarsus 0.37.

Variation. ( Fig. 8 B, D, F ) The female is very similar to the male, except for slightly dilated pedipalp femur.

Distribution. BRASIL: Rio Grande do Sul, Santa Catarina ( Fig. 2 A ).

Figures

FIGURE 2. Distribution of Maurymontia species with elevation layers (A). Distribution of Maurymontia species, showing the representation of the Peripampasic Arc (B).

FIGURE 8. Maurymontia brasiliana comb. nov., male (A, C, E), female (B, D, F). Scale bars: A, C–F 500 µm, B 1 mm.

FIGURE 9. Maurymontia brasiliana comb. nov., male, pedipalp, ectal (A), Penis, ventral view (B), lateral view (C), dorsal view (D). Scale bars: A 500 µm, B–D 100 µm.