Tenebriochernes pilosus, Bedoya-Roqueme & Torres, 2019

Bedoya-Roqueme, Edwin & Torres, Richard A., 2019, Tenebriochernes, a new genus and species of Chernetidae (Arachnida: Pseudoscorpiones) from north-western Colombia, with ecological observations, Zootaxa 4624 (1), pp. 87-107 : 99-101

Tenebriochernes pilosus n. sp.

Figs 7–8 ; 40–54 ; 55.

urn:lsid:zoobank.org:act:409B7802-A553-431F-AACA-0C2940FD2E6C

Material examined. Female holotype: Montería, Córdoba department, Colombia: Patio Bonito-Santa Isabel , 8°36´42” N, 75°44´32” W, elev. 192 m, 2 December 2013, E. Bedoya-Roqueme leg. ( LEUC; Ps-040) . Two male paratypes, same data and repository as holotype ( LEUC; Ps-041) .

Diagnosis. Tenebriochernes pilosus n. sp., can be easily distinguished by the trichobothria et and it located distally near fingertip, est proximal of isb, ib distal of ist and distinctly proximal of isb, trichobothrium ib, ist, esb and eb grouped at the base of the fixed finger in a diagonal row, st proximal to the level of est and close to the margin of the finger; nodus ramosus proximal of t and distal of st; length/ width of the femur, female 2.8 × (males 2.5–2.6 ×); patella 2.6 × (males, 2.5–2.6 ×); hand with pedicel 1.5 × (males, 1.6–1.7 ×); chela with pedicel 2.3 × (males, 2.5–2.6 ×); chelal fixed finger of female with 34 teeth offset in saw-like arrangement, two retrolateral accessory teeth and one prolateral accessory tooth (males, 30-32 teeth, two retrolateral accessory teeth, without prolateral accessory tooth); movable chelal finger of female with 38 teeth, two retrolateral accessory teeth and two prolateral accessory teeth (males, 34-36 teeth, two retrolateral accessory teeth and without prolateral accessory teeth). Spermatheca consisting of distally well-expanded and less globose sacs with darkened tips, and two shorts tubes which do not lead to a single medium chamber.

Adult. Carapace and pedipalps red-brownish, legs yellow-brownish, heavily granulate ( Figs 40–41 ). Carapace ( Fig. 42 ) with granules of mesozone hexagon-shaped, large and spaced ( Figs 12–13 ); with two indistinct transverse furrows which are granulate; subbasal transverse furrow closer to medial furrow than to posterior margin; without eyes or eye-spots; female with about 105 setae (males with about 95-98 setae), each denticulate, short and strongly clavate; female with six setae on anterior margin and 16 on posterior margin (males with nine setae on anterior margin and 16-18 setae on posterior margin), each short and strongly clavate; 1.3× as long as broad (males 1.1-1.2× as long as broad). Pedipalpal coxa of female and males with three subdistal setae, indistinctly granulate, all setae simple and acuminate, coxa I with 30-32 setae, coxa II 28-30 (of which two suboral microsetae), coxa III 34 –38, and coxa IV 36 –48 setae.

Pleural membrane longitudinally striated ( Figs 40–41 ). All the tergites divided (except the XI), male with tergite I apparently not divided, and XI divided ( Figs 40–41 ); tergites with scaly sculpture, strongly granulate; all the setae broadly clavate setae and on tubercles. Chaetotaxy of tergites I–XII: female holotype: 14: 16: 18: 20: 20: 22: 20: 20: 16: 14: 10: 2; male paratypes: 14–16: 16-18: 18-20: 18–20: 20-22: 20-22: 14-16: 14-16: 14-16: 12-14: 10-12: 2. Tergites IV-IX each with two lateral and two medial setae, without tactile setae on tergite XI. Sternites divided, with scaly sculpture, all the setae broadly clavate. Sternal chaetotaxy of female holotype, sternites II–XII: 32: (3) 14 (3): (3) 18 (3): 18: 18: 16: 16: 16: 16: 10: 2; males, 28(30): (3)30(3):(3)16–18(3): 16-18: 16-18: 16-18: 14-16: 14- 16: 14-16: 10-12: 2, no tactile setae. Anterior genital operculum of a female with 32 setae on each side and 14 setae along the posterior margin ( Fig. 53 ). Spermatheca consisting of distally well-expanded and less globose sacs with darkened tips, and two shorts tubes which do not lead to a single medium chamber ( Fig. 53 ). Anterior genital operculum of male with a set of 30 microsetae grouped on each side of operculum on the anterior region, and a set of 28 long setae located on the center, posterior genital operculum with 28-30 setae along the posterior margin ( Fig. 54 ).

Chelicera: hand with 6 setae, setae es, bs 1 bs 2 and sbs denticulate, ls and is long and acicular ( Fig. 43 ); fixed finger with 3 large and 2 small teeth, movable finger with a subapical tooth–like lobe; galea of female and males with the tips bifid and a subdistal ramus ( Figs 45–46 ); serrula exterior 20–21 blades; rallum with 4 blades, distal blade dentate, others smooth ( Fig. 44 ).

Pedipalps (Figs 47–48): elongated and robust, strongly granulate, with broad clavate setae on tubercles, setae on chelal hand more slender, those on both fingers simple; trochanter with a rounded dorsal hump, female holotype: 1.8× (males, 1.7–1.8×); femur robust, basally pedicelled, 2.8× (males 2.5–2.6×); patella robust, retrolateral margin with a concavity near midpoint of segment, 2.6× (males, 2.5–2.6×); hand with pedicel 1.5× (males, 1.6–1.7×); chela with pedicel 2.3× (males, 2.5–2.6×); 7 long denticulate and thickened setae (Sd) proximal of base of fixed finger chelal; base of movable chelal finger with strong concavity proximal of condyle and four short denticulate and thickened setae (Sd) (Fig. 49). Fixed finger of female with 34 teeth offset in saw-like arrangement, giving heterodonty shape, including 22 flattened proximal teeth and 12 acute, spaced teeth; two retrolateral accessory teeth and one prolateral accessory tooth (males, with 30-32 teeth, giving heterodonty shape, including 20 flattened proximal teeth and 12 acute spaced teeth; two retrolateral accessory teeth, without prolateral accessory teeth) (Fig. 49). Fingertip of fixed chelal finger with four apical teeth in saw-shape; movable chelal finger of female with 38 teeth, two retrolateral accessory teeth and two prolateral accessory teeth; two retrolateral accessory teeth in saw-shape near to fingertips on internal margin of movable finger (males, 34-36 teeth, two retrolateral accessory teeth and without prolateral accessory teeth; 3 retrolateral accessory teeth in saw-shape near to fingertips on internal margin of movable finger). Trichobothria: et and it located distally near fingertip, est proximal of isb, ib distal of ist and distinctly proximal of isb, trichobothrium ib, ist, esb and eb grouped at the base of the fixed finger in a diagonal row, st proximal to the level of est and close to the dental margin of the finger; nodus ramosus proximal of t and distal of st (Fig. 49).

All legs yellowish, surface granulate, setae long and multidentate, hence pilose appearance on the legs ( Figs 50–51 ), tactile setae on tarsus IV absent ( Fig. 51 ). Leg I: trochanter female holotype 1.2× (males, 1.3–1.4×), femur 1.5× (1.7–1.8×), patella 2.4× (2.0-2.1×), tibia 4.4× (4.1–4.3×), tarsus 5.1× (5.0–5.2×). Leg IV: trochanter female holotype 1.8× (males 1.6–1.7×), femur + patella 2.3× (2.6–2.7×), tibia 5.3× (5.5–5.7×), tarsus 5.5× (5.1–5.2×), subterminal setae toothed and curved; claws extremely toothed and longer than the undivided arolia ( Fig. 52 ).

Measurements (mm): Female holotype: body length 3.9; carapace 1.04/0.85. Chelicera 0.30/0.16. Pedipalp: trochanter 0.45/0.27; femur 0.96/0.35; patella 0.90/0.36; hand (with pedicel) 0.93/0.66; chela (with pedicel) 1.55/0.66; chela (without pedicel) 1.48/0.66; movable finger length 0.69. Leg I: trochanter 0.21/0.18; femur 0.26/0.18; patella 0.36/0.16; tibia 0.48/0.11; tarsus 0.46/0.09. Leg IV: trochanter 0.29/0.17; femur + patella: 0.47/0.19; tibia 0.58/0.11; tarsus 0.50/0.09. Male paratypes: Body length 3.5-3.6; carapace 0.85–0.86/0.78–0.79. Chelicera 0.30–0.31/0.15–0.16. Pedipalp: trochanter 0.45–0.46/0.25–0.26; femur 0.87–0.89/0.30–0.31; patella 0.86–0.87/0.33–0.34; hand (with pedicel) 0.85–0.86/0.67–0.68; chela (with pedicel) 1,50–1,51/0,67–0,68; chela (without pedicel) 1.45–1.46/0.67–0.58; movable finger length 0.61–0.63. Leg I: trochanter 0.18–0.19/0.12–0.14; femur 0.26–0.27/0.13–0.14; patella 0.33– 0.34/0.14–0.15; tibia 0.44–0.45/0.10–0.11; tarsus 0.41–0.42/0.08–0.09. Leg IV: trochanter 0.26–0.27/0.15–0.16; femur + patella 0.48–0.49/0.20–0.21; tibia 0.60–0.61/0.11–0.12; tarsus 0.50–0.51/0.10–0.11.

Etymology. The specific epithet ( pilosus ) is a Latin adjective meaning “pilosus”, emphasizing the hairy legs in both male and female.

Distribution ( Fig. 55 ).: Only known from the type locality.

Figures

FIGURE 55. Map of North-western Colombia showing recorded distribution of the species belonging to the Tenebriochernes n. gen.

FIGURES 5–8. Habitat reported in this study: 5, Cerro Mohan. 6, Litter leafcutter. 7, Dry forest, Patio bonito locality. 8, mounds of detritus of Atta colombica (Guérin-Méneville 1844).

FIGURES 40–41. Tenebriochernes pilosus n. sp., Habitus: 40, female holotype, dorsal view. 41, male paratype, dorsal view. Scale line = 1 mm (Figs 40-41).

FIGURES 42–46. Tenebriochernes pilosus n. sp., female holotype, dorsal view, unless stated otherwise: 42, carapace, dorsal view. 43, left chelicera, dorsal view. 44, left rallum, lateral view. 45, left galea, lateral view; 46, left galea, lateral view, male paratype. Scale lines = 0.5 mm (Fig. 42), 0.1 mm (Figs 43–44), 0.05 mm (Figs 45–46).

FIGURES 50–52. Tenebriochernes pilosus n. sp., female holotype: 50, left leg I, lateral view. 51, left leg IV, lateral view. 52, arolium, aspect (Aro) and of the claws (Clw). Scale lines = 0.1 mm (Figs 50–51); 500 μm (Fig. 52).

FIGURES 53–54. Tenebriochernes pilosus n. sp., genital sternites: 53, genital sternites, ventral view, male paratype. 54, genital sternites, ventral view female holotype. Scale lines = 500 μm (Figs 53–54).

FIGURES 11–13. Tenebriochernes concavus n. sp. female holotype, dorsal view: 11, carapace aspect. 12–13, granules metazone, aspect. Scale line = 1 mm (Figure 11); 500 μm (Figs 12-13).