Petrobunus hebei, Zhang & Zhang & Sharma, 2018

Zhang, Chao, Zhang, Feng & Sharma, Prashant P., 2018, Two new species of Petrobunus from China (Opiliones: Laniatores: Petrobunidae), Zootaxa 4524 (1), pp. 51-64 : 56-62

Petrobunus hebei sp. nov.

( Figs. 23–36 , 41–49 )

Type material. Male holotype, China: Hebei Province, Baoding City, Yi Country, Mt. Yunmeng Shan [N 39°24´, E 115°15´], alt. 440m, June 12, 2012, C. Zhang leg. (MHBU-Opi-16 ZC1116 ). One female, paratype (MHBU-Opi- 16 ZC1117 ) , same collecting data as holotype.

Diagnosis. Unique tarsal formula (2:2:4:4); body, including ocularium and legs, unarmed; stylus short and straight.

Etymology. The specific epithet is a noun in apposition, referring to the type locality.

Description. Male habitus as in Figs. 23, 24 , 28 , 46–48 . Coloration ( Figs. 46–48 ): entire body yellow; carapace and ocularium with blackish brown reticulations; opisthosomal region of scutum and free tergites with transverse rows of brown stripes; coxae and genital operculum yellow; all free sternites with brown bands; legs yellow to brown as well as basitarsus, remaining tarsomeres whitish yellow.

Dorsum ( Figs. 23 , 46 ). Dorsal scutum granular and trapezoid in shape, widest portion of body at scutal area V. Carapace with two blunt pegs on each side of anterior margin of carapace near antero-lateral corners. Ocularium unarmed. Scutal sulci of mesotergum indistinct. Scutum and free tergites unarmed.

Venter ( Figs. 24 , 47 ). Surface of all coxae granulated. Coxa II with many setose tubercles retrolaterally. Coxa III with prolateral and retrolateral tubercular bridges to adjacent coxae. Coxa IV greatly enlarged, with setose tubercles on anterior margin. Genital operculum sub-triangular. Spiracles not concealed. Opisthosomal free sternites with belts of small regular tubercles.

Chelicera ( Figs. 29–31 ). Proximal article with a prominent bulla, but without any conspicuous armament. Second article unarmed, with scattered setae on the prodorsal surface. Fingers relatively short, dentition as illustrated ( Fig. 31 ); movable finger with three teeth; fixed finger with five teeth.

Pedipalp ( Figs. 25, 26 ). Coxa dorsally with one small blunt tubercle. Trochanter ventrally with one short proximal and one long distal setiferous tubercle. Femur ventrally with a row of four setiferous tubercles, two proximal ones being the longest, the medial one being the shortest; on the medial distal side with one setiferous tubercle. Patella with one setiferous tubercle disto-medially. Tibia with two setiferous tubercles mesally; ectally with one short proximal and two long setiferous tubercles. Tarsus with two setiferous tubercles on both sides of ventral surface. Tarsal claw curved and smooth, approximately the same length as the tarsus.

Legs ( Figs. 32 , 46–48 ). All segments finely granulated. Trochanter III enlarged. Trochanter IV greatly enlarged, oval in lateral aspect and umarmed ( Fig. 32 ). Femora III–IV curved, especially femur IV. Femur IV, Patella IV and tibia IV with enlarged granules ( Fig. 32 ). Tarsi III–IV with bare double claws, without scopulae. Tarsal claws smooth. Tarsal formula, 2 (1): 2 (1): 4: 4.

Penis ( Figs. 41–45 ). Basal portion of the shaft slender, then distended until apical portion (pars distalis). Apex of ventral plate somewhat triangular. Ventral plate with five pairs of setae on lateral margins. Glans free in apical part, with parastylar lobe extending proximally (not inflatable). Capsula externa cylindrical. Capsula interna globular. Diameter of fully inflatable Capsula interna conspicuously longer than that of the capsula externa. Parastylar lobes including one triangular ventral lobe and two square-shaped dorsal lobes. Stylus short, straight, similar in length to capsula externa.

Female. ( Figs. 27 , 33, 34 , 49 ). In general appearance similar to the male ( Figs. 27 , 49 ), with a slight difference in inner edges of cheliceral finger ( Fig. 33 ) and leg IV not enlarged ( Fig. 34 ).

Ovipositor ( Figs. 35, 36 ) composed of two apical lobes, each bearing two dorsal setae, one ventral seta, and two apical setae.

Measurements. Male holotype (female paratype): body 1.51 (1.54) long, prosoma 0.64 (0.66) wide, opisthosoma 0.96 (1.08) wide; length-to-width ratio 1.57 (1.43). Ocularium 0.12 (0.14) long, 0.20 (0.21) wide. Pedipalp claw 0.19 (0.19) long. Penis 0.81 long. Measurements of pedipalp and legs as in Tables 3, 4.

Habitat. The specimens were collected by sifting leaf litter in shrubs close to the trail depicted in Figs. 50, 51 .

Distribution. Known only from the type locality ( Fig. 52 ).

Notes. Petrobunus hebei sp. nov. is the northernmost Laniatores species from China.

Figures

FIGURE 52. Geographic distribution of Petrobunidae taxa.

FIGURES 23–27. Petrobunus hebei sp. nov. male holotype and female paratype. 23. Male body, dorsal view. 24. Same, ventral view. 25. Male, left pedipalp, ectal view. 26. Same, medial view. 27. Female body, dorsal view. Scale bars: 0.5 mm.

FIGURES 28–36. Petrobunus hebei sp. nov. male holotype and female paratype. 28. Male body, lateral view. 29. Male, left chelicera, medial view. 30. Same, ectal view. 31. Male, cheliceral fingers, frontal view. 32. Male, left leg IV, retrolateral view. 33. Female, cheliceral fingers, frontal view. 34. Female, left leg IV, retrolateral view. 35. Ovipositor, dorsal view. 36. Same, ventral view. Scale bars: 0.5 mm (28, 32, 34); 0.25 mm (29–31, 33, 35, 36).

FIGURES 37–45. Penis. 37–40. Petrobunus chongqing sp. nov. holotype, 41–45. Petrobunus hebei sp. nov. holotype. 37. Penis, dorsal view. 38. Same, lateral view. 39. Distal part of penis (expanded), lateral view. 40. Same, lateral view. 41. Penis, dorsal view. 42. Same, lateral view. 43. Distal part of penis (expanded), lateral view. 44. Same, lateral view. 45. Same, lateral view (fully expanded). Ce, capsula externa; Ci, Capsula interna; DI, dorsal lobe; G, glans; Pb, pars basalis; Pd, pars distalis; S, stylus; VI, ventral lobe; VP, ventral plate. Scale bars: 0.25 mm

FIGURES 46–51. Photographs and habitat of Petrobunus hebei sp. nov. male holotype and female paratype. 46. Male body and parts of appendages, dorsal view. 47. Same, ventral view. 48. Same, lateral view. 49. Female body and parts of appendages, dorsal view. 50–51. Habitat. Scale bars: 0.5 mm (46–49).