Cyriocosmus paresi sp. nov.

urn:lsid:zoobank.org:act: F7A478F4-051A-43C7-948B-68B0533200EE

Figs 1–4, 9, 43–52, 115, 119, Table 1

Diagnosis

Males of Cyriocosmus paresi sp. nov. differ from congeners by a combination of carapace with dark oval band (Figs 1, 115), dorsal abdomen with four prominent stripes (Figs 2, 115) and ventral abdomen with longitudinal band of dark setae (Fig. 3). Male palpal bulb is similar to C. aueri, C. bertae, C. elegans, C. foliates, C. itayensis, C. leetzi, C. nicholausgordoni, C. paredesi, C. peruvianus and C. versicolor by the short paraembolic apophysis (PA), less than half of embolus length (Figs 43–45). The new species can be distinguished from all species, except from C. fasciatus (Fukushima et al. 2005: 6, fig. 10), by the pronounced anterior prolateral tegular apophysis (PT) (Figs 45–46) and from C. fasciatus by the extended vertical distance in the region between embolus and paraembolic apophysis (V) (Figs 43, 45). Females are unknown.

Etymology

The name is in honor of the Paresí indigenous people, originating from the north region of Mato Grosso State, Brazil, known for their historical resistance against colonization.

Type material

Holotype

BRAZIL • ♂; Mato Grosso, Campo Novo dos Parecis, 23 Oct. 2017; N. Porfírio col.; CAD 1441.

Paratypes

BRAZIL • 3 ♂♂; same data as for holotype; CAD 1442 .

Description

Male (holotype CAD 1441)

Color (in alcohol): carapace, lateral margins reddish-brown, dark oval central band covering caput and thoracic fovea. Chelicerae dark brown, legs dark grey except by the patellae reddish-brown. Dorsal abdomen black with 4 light brown stripes. Mirror patch light brown color. Sternum, coxae and maxillae reddish brown, labium dark brown. Ventral abdomen reddish brown with longitudinal spot of dark bristles (Figs 1–4). Live specimens show golden pubescence in reddish-brown areas of carapace (Fig. 115). Type III urticating setae only, with short barbs, on the central dorsum of the abdomen.. Total length: 11.42. Chelicerae basal segment: length 1.42. Carapace elongated: length 5.07, width 4.03. Abdomen: length 6.28. Clypeus absent. Eye tubercle slightly elevated, sub-rectangular: length 0.49, width 0.95. Anterior eye row slightly procurved, posterior slightly recurved. Eyes sizes and interdistances: AME 0.19, ALE 0.24, PME 0.12, PLE 0.18, AME–AME 0.10, AME–ALE 0.06, ALE–ALE 0.62, PME–PME 0.44, PME–PLE 0.03, PLE–PLE 0.64, AME–PME 0.03, ALE–PLE 0.10. Thoracic fovea straight, narrow, deep: width 0.74. Chelicerae basal segment with 7 well-developed teeth on furrow promargin, with a group of ca 10 small teeth on proximal area of furrow. Intercheliceral tumescence absent. Maxillae with ca 100 cuspules, located on anterior inner corner.

Labium subrectangular: length 0.63, width 1.05, with ca 38 cuspules. Sternum slightly round: length 2.58, width 2.36; with three pairs of oval sigilla separated by its diameter from the edge.

Palp: palpal bulb with rectangular tegulum, pronounced PT (Figs 43–46); short PS, discreetly pronounced (Figs 43, 45); short PA, detached from PS (Figs 43, 45), slightly curved to prolateral view (Fig. 44), raised from embolus by a extended vertical region (V) with height of half the length of the embolus (Figs 43, 45); embolus thin and long, below PA (Figs 43, 45). Cymbium with two asymmetric lobes. Palpal tibia unmodified (Figs 47–49).

Tibial apophysis: prolatero-ventral spur with two branches of different sizes (Fig. 51); retrolateral branch larger, slightly procurved, with a small apical spine (Figs 50–52); prolateral branch with half the length of the retrolateral branch, with contiguous apical spine slightly longer (Figs 51–52). Metatarsus I folds retrolaterally to tibial apophysis.

Superior tarsal claws without teeth. Tarsal scopulae: I-II entire with longitudinal band of conical setae; III-IV divided by longitudinal band of conical setae. Metatarsal scopulae dense, extension: I and II on distal 3/4; III and IV on less than half. Clavate tarsal trichobothria in two rows, each with ca 7 trichae, interspersed with ca 9 filiform trichobothria of different sizes. Leg formula 4123 (Table 1).

Spination (proximal to distal): cymbium and tarsi without spines. Palp: femur 0; patella 0; tibia (r) 0. Leg I: femur 0; patella 0; tibia (v) 1-2-ap2; metatarsus (v) 1-0-ap1, (p) 1. Leg II: femur (p) 1; patella 0; tibia (v) 1-2-ap2, (p) 1; metatarsus (v) 1-1-ap1, (p) 1. Leg III: femur (r) 1; patella 0; tibia (v) 1-1-ap2, (p) 1-1-0, (r) 0-2-ap1; metatarsus (v) 1-1-2, (p) 0-1-1, (r) 1-1-1. Leg IV: femur (p) 1, (r) 1; patela 0; tibia (v) 1-1-ap2, (p) 1-1-0, (r) 1-2-0; metatarsus (d) 1, (v) 1-1-ap2, (p) 1-1-ap2, (r) 1-2-ap3.