Piloctenus gryseelsi, Henrard & Jocqué, 2017

PILOCTENUS GRYSEELSI View in CoL SP. NOV.

( FIGS 32A – E View Figure 32 , 33A – C View Figure 33 , 34A – D View Figure 34 )

http://zoobank.org/ urn:lsid:zoobank.org:act:90799CB7-DF48-4473-9649-921E2D3B39C7

Type material

Holotype: male: GUINEA: Mt. Nimba, Matalayou Forest , 7 ° 39 0 N, 8 ° 19 0 W, 519 m asl, 17.III.2012, hand collecting on the ground and on the vegetation at night, Van den Spiegel D., Henrard A., Allard C., Bimou P. & Sidibe M. ( DNA-N26 , MRAC 238922 View Materials ). GoogleMaps

Paratypes: GUINEA: 1 ♂: Mt. Nimba, Pierre Richaud, Ziela Forest , 7 ° 42 0 N, 8 ° 21 0 W, 563 m asl, 16.II.2012, primary forest, sieving leaf litter, Van den Spiegel D., Henrard A., Allard C., Bimou P. & Sidibe M. ( MRAC 238940 View Materials ) GoogleMaps ; 1 ♀: Mt. Nimba, Gbie Forest , 7 ° 40 0 N, 8 ° 19 0 W, 469 m asl 16.III.2012, hand collecting on the ground at night, Van den Spiegel D., Henrard A., Allard C., Bimou P. & Sidibe M. ( MRAC 239221 View Materials ) GoogleMaps .

Other material

GUINEA: 1 ♂: Kouankan , 08 ° 26 0 N, 9 ° 08 0 W, 5.IV.2000, hand collection at night, Van der Donckt J.F. ( MRAC 213488 View Materials ) GoogleMaps .

Etymology

The species name is a patronym in honour of Guido Gryseels, director of the Royal Museum for Central Africa, who facilitated studies on invertebrates in the zoology department.

Diagnosis

Males of Piloctenus gryseelsi are recognized by the modified tarsus IV ( Fig. 34C View Figure 34 ), so far unique in the genus, and by the cymbium ( Figs 33A, B View Figure 33 , 34A, B View Figure 34 ) with a sharp, proximal, dorsolateral process with tip pointing forward and the compressed RTA with the long, triangular tip pointing obliquely down. Females are characterized by the epigyne ( Figs 33C View Figure 33 , 34D View Figure 34 ) longer than wide with slightly curved but strongly sclerotized lateral margins delimiting a lighter longitudinal rectangular setose patch.

Description

Male (holotype). Total length 10.6. Carapace 5.3 long and 4.4 wide. Clypeus 0.21 high. Eye diameters: AME 0.34, ALE 0.18, PME 0.34, PLE 0.33. Coloration in alcohol ( Fig. 32B, D, E View Figure 32 ): carapace brownish yellow with faint slightly darker greyish radiating striae; chelicerae brownish yellow; sternum pale yellow; legs orange yellow; abdomen: dorsum grey, in front with medium pale stripe flanked by dark patch on either side followed by three pairs of dark spots, sides uniform grey, venter pale with greyish spots and darker are in front of yellow spinnerets. Living specimens ( Fig. 32A View Figure 32 ) are greyish brown with marked dark spots on the abdomen. Carapace sparsely covered by tiny, colourless setae; few short dark setae on clypeus and in eye region. Chelicerae with three promarginal teeth, median larger; four retromarginal subequal teeth; without intermarginal denticles. Leg measurements: I: femur 5.6 patella 2.3/ tibia 5.6/ metatarsus 6.2/ tarsus 2.0/ total 21.8 II: 5.9/ 2.2/ 5.0/ 5.7/ 1.7/ 20.4; III: 5.0/ 2.1/ 3.7/ 4.7/1.5/ 16.9; IV: 6.3/ 2.1/ 5.5/ 7.7/ 2.0/ 23.5.Leg formula 4123. Leg spination: femur I pl1-1-1 d1-1-1 rl1-1-1, II pl1-1-1 d1-1-1 rl1-1-1-1, III pl1-1-1-1 d1-1-1 rl1-1-1-1, IV pl1-1-1 d1- 1-1 rl1-1-1; patella I pl1 rl1, II pl1 rl1, III pl1 rl1, IV pl1 rl1; tibia I v2-2-2-2-2 pl1 d1-1-1 rl1-1, II v2-2-2-2- 2 pl1 d1-1-1 rl1-1, III v2-2-2 pl1-1 d1-1-1 rl1-1, IV v2-2-2 pl1-1 d1-1-1 rl1-1; metatarsus I v2-2-2 pl1-1-1 rl1-1-1, II v2-2-2 pl1-1-1 rl1-1-1, III v2-2 pl1-1-1 rl1- 1-1, IV 10 dispersed dw4; Mt IV modified ( Fig. 34D View Figure 34 ): long, slightly sinuous, dispersed spines long, overlapping in proximal half. Palp ( Figs 33A, B View Figure 33 , 34A, B View Figure 34 ): tibia with ventral and prolateral rounded processes on distal margin; subdistal triangular RTA angled with long, sharp tip pointing down; one prolateral macroseta in proximal half; cymbium with dorsal scopula and sharp dorsolateral process with tip pointing forward; embolus, MA and conductor as typical for the genus.

Female (paratype). Total length 10.3. Carapace 5.3 long and 3.9 wide. Clypeus 0.16 high. Eye diameters: AME 0.25, ALE 0.18, PME 0.26, PLE 0.23. Coloration in alcohol ( Fig. 32C View Figure 32 ): cephalothorax pale yellow with faint radiating striae, chelicerae yellowish brown; sternum pale yellow; palpal femur pale yellow, remainder brownish yellow; legs pale yellow, Fe and T faintly ringed with grey; abdomen as in male; spinnerets brownish yellow. Carapace sparsely covered with small dark hairs and larger black hairs. Chelicerae with three promarginal teeth, median larger; four retromarginal subequal teeth; without intermarginal denticles. Leg measurements: I: femur 4.0 patella 2.1/ tibia 3.6/ metatarsus 3.6/ tarsus 1.3/ total 14.6; II: 4.0/ 2.0/ 3.4/ 3.5/ 1.7/ 14.1; III: 3.5/ 1.6/ 2.7/ 3.1/ 1.2/ 12.0; IV: 4.3/ 1.7/ 3.5/ 5.4/ 1.4/ 16.3. Leg formula 4123. Leg spination: Leg formula 4123. Leg spination: femur I pl1-1 d1-1-1 rl1-1-1 vl1, II pl1-1-1- 1 d1-1-1 rl1-1-1 vl1, III pl1-1-1-1 d1-1-1 rl1-1-1, IV 1- 1-1 d1-1-1 rl1-1-1; patella I, II none, III pl1 rl1, IV pl1 rl1; tibia I v2-2-2-2-2, II v2-2-2-2-2 d1-1-1-1, III v2-2-2 pl1-1 d1-1-1 rl1-1, IV v1-2-2 pl1-1 d1-1-1 rl1-1; metatarsus I v2-2-2, II v2-2-2, III v2-2-2 pl1-1-1 rl1- 1-1, IV v1-1-1 pl1-1-1 d1-1-1 rl1-1-1; with ventral scopula as usual; Mt IV unmodified. Epigyne ( Figs 33C View Figure 33 , 34C View Figure 34 ): MS with long, perfectly rectangular setose, pale yellow, median part, on either side with slightly curved, sclerotized margins; LP very large basally, with smoothly curved, blunt tip.

Distribution

The species is known from Mt. Nimba and from a lowland forest to the north-west of the mountain.

PILOCTENUS HAEMATOSTOMA JOCQUE � & HENRARD