Maurymontia grismadoi, Porto & Iglesias & Pérez-González, 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 : 253-255

Maurymontia grismadoi sp. nov.

urn:lsid:zoobank.org:act:

( Figs 2A , 20–21 )

Type material. ♂ holotype (MACN-Ar 46023) from Argentina, Misiones Province, Salto Aguti , Salto Encantado. I-2005, Grismado, Lopardo, Piacentini, Quaglino, Rubio col.

Etymology. The specific name is a patronym honoring our friend and colleague, the Argentine arachnologist Cristian Grismado, in recognition of his fervent dedication to arachnology, his devotion to the natural sciences, his outstanding contributions to arachnid taxonomy and systematics, and his participation in the collection of the studied specimen.

Diagnosis. This species is readily distinguishable from other members (except from M. mborore ) of the genus due to its short, rounded and minimally projected ocularium. The lower edge of the femur of the pedipalps exhibits 2–3 basal cruciform tubercles. Additionally, the capsula interna is thinner compared to other species within the genus, and the ventral plate is thicker. Tarsus I with only two tarsal segments, a species of small size only compared to M. brasiliana and M. mborore . Capsula externa of the penis with a U-shaped distal portion (dorsal view).

Measurements holotype (MACN-Ar 46023): Total length 1.44; carapace length 0.58, maximum width 0.89; dorsal scutum length 1.15; mesotergal scute maximum width 1.12. Pedipalps: trochanter 0.12, femur 0.55, patella 0.36, tibia 0.51, tarsus 0.49. Leg I: trochanter 0.13, femur 0.55, patella 0.29, tibia 0.35, metatarsus 0.39, tarsus 0.47. Leg II: trochanter 0.19, femur 0.67, patella 0.32, tibia 0.56, metatarsus 0.54, tarsus 0.64. Leg III: trochanter 0.14, femur 0.45, patella 0.26, tibia 0.46, metatarsus 0.50, tarsus 0.40. Leg IV: trochanter 0.19, femur 0.76, patella 0.34, tibia 0.58, metatarsus 0.77, tarsus 0.47.

Description. Male (MACN-Ar 46023). Dorsum ( Fig. 20 A–C ). Eta (η) hourglass-shaped dorsal scutum. Ocularium conical, short, 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 ( Fig. 20 D ). Distal areas of the coxae covered by granules, coxa II has a distal tubercle longer than the others present in the other coxae. Spiracles visible. Sternum arrow-shaped, located in a microgranulate groove.

Chelicerae. Segment I–II with small scattered tubercles.

Pedipalp ( Fig. 21 A ). Trochanter with two dorsal tubercles and one ventral tubercle with subdistal setae. Femur with a ventro-ectal tubercle and a row of small tubercles with setae in dorso-ectal view. The ventral femur exhibits a row of ventral tubercles with subdistal setae. Patella smooth. Tibia is covered ventrally by small rounded tubercles and has three ventral tubercles with subdistal setae on each side. Tarsus has three ventral tubercles with subdistal setae each side and small scattered ventral tubercles with subdistal setae.

Legs. Leg I–IV covered by small tubercles (the femur I has a ventral row of larger tubercles than other legs), astragalus larger than the calcaneus on all legs, tarsal count: 2-2-3-3.

Penis ( Fig. 21 B–D ). Pars distalis with a ventral plate, without a cleft, forming a lamella, longer than wide (almost rectangular), with three ventral and two dorsal macrosetae each side; capsula externa higher than the ventral plate, surrounding the capsula interna that is tubular in shape. Unlike the other species of the genus, in this case, the capsula externa is longer than the capsula interna, covering the capsula interna completely. Distal portion of the stylus with a dorsal-apical groove.

Female

Unknown

Distribution. Known only from the type locality ( 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 20. Maurymontia grismadoi sp. nov., male. Scale bars: A 1 mm, B–D 500 µm.

FIGURE 21. Maurymontia grismadoi sp. nov., male, pedipalp, ectal (A). Penis, ventral view (B), lateral view (C), dorsal view (D). Scale bar: A 500 µm, B–D 100 µm.