Description of two new Stenohya species from China (Pseudoscorpiones, Neobisiidae)

Abstract Two new species of the genus Stenohya Beier, 1967 are described from China: Stenohya pengaesp. n. (male and female; type locality Daming Mountain, Nanning City, Guangxi Zhuang Autonomous Region) and Stenohya huangi sp. n. (female; type locality Gushan Mountain, Fuzhou City, Fujian Prov.).The presence of Stenohya pengae sp. n. in the tree crown of Castanopsis fabri represents a new habitat for Neobisiidae. A key and a distribution map of the Chinese Stenohya species are also provided.


Introduction
Stenohya Beier, 1967 is a small Asian pseudoscorpion genus of the family Neobisiidae Chamberlin, 1930. At present it includes 12 species (Harvey 2011;Zhao et al. 2011), of which three have been reported from China: S. chinacavernicola Schawaller, 1995 (Sichuan Province), S. curvata Zhao et al., 2011 (Yunnan Province) and S. xiningensis Zhao et al., 2011 (Qinghai Province). Male with slender pedipalps (femur 6.79-7.20, patella 6.17-6.25 times longer than broad Description of male (Fig. 1). Colour mostly dark brown, pedipalps and legs reddish brown. Setae of body straight and acicular. Carapace ( Fig. 2) smooth, longer than broad, with a total of 34-36 setae, including 8 on anterior margin and 8 on posterior margin; paired lyrifissures near the eyes and posterior margin; epistome small and triangular; 4 eyes, anterior pair with well developed lens, posterior pair with weak lens.
Pedipalps. Lateral face of coxa with 3-5 ordinary lyrifissures at margin of foramen, plus 0-3 at dorsal margin and 2 curved lyrifissures; fixed chelal finger with 66-79 teeth, movable finger with about 45-55 contiguous teeth which are pointed and of slightly unequal length in distal half, rounded and low in basal half.
Chelicera. Palm with 7 setae (two females with 8 on left and 7 on right cheliceral palm, one female with 6 on left and 7 on right palm), movable finger with 1 sub-medial seta; serrula exterior with 34-36 lamellae; serrula interior with 28-33 lamellae; galea (Fig. 11) elongate and divided into three main branches, two of which are secondarily divided into 2 terminal branchlets; rallum (Fig. 12)  Distribution. This species is known only from the type locality. Remarks. Three Stenohya species have been previously recorded from China: S. chinacavernicola Schawaller, 1995, S. curvata Zhao et al., 2011 andS. xiningensis Zhao et al., 2011. S. pengae sp. n. can easily be separated from these species by its extremely slender pedipalpal segments, 4 well-developed eyes, the absence of a spine at the base of the male chelal hand, and the presence of medial discal setae on male sternites VI-VIII only.
Specimens of S. pengae were found on the leaves of Castanopsis fabri, which represents an exceptional habitat for Neobisiidae. Neobisiidae generally live in leaf litter and soil, under rock, bark and in caves, although they have sometimes been found climbing young trees and shrubs (Weygoldt, 1969). Fourty-one specimens of S. pengae were collected by sweeping trees of C. fabri with an entomological net; only two were found on stone steps and these might have been dislodged from the trees. The collector also examined the tree bark and leaf litter around the trees, without finding any specimens of S. pengae.
Approximately 100 pseudoscorpion specimens were collected from Fujian and Guangdong provinces were extracted by beating shrubs, of which 74 (including 4 protonymphs, 2 deutonymphs, 11 tritonymphs and 57 adults) belong to the genus Geogarypus Chamberlin, 1930(family Geogarypidae Chamberlin, 1930 and 22 tritonymphs belong to the genus Bisetocreagris Ćurčić, 1983 (family Neobisiidae). All of the S. pengae specimens were adults. Adis and Mahnert et al. (1988) found that Brazilatemnus browni Muchmore was bivoltine, with one generation occuring in the trunk/canopy habitat in April/May (during forest inundation) and the second in the forest floor in November/December (non-inundation period). It might therefore be interesting to look for S. pengae in both habitats at different times of the year.  Etymology. The specific name is a patronym in honour of Prof. Fu-Sheng Huang, who collected and donated the specimen.
Diagnosis. Species with slender pedipalps (femur 6.40, patella 5.25, chela with pedicel 4.87, chela without pedicel 4.57 times as long as broad) and slender legs IV (e.g. femur+patella 7.23 times as long as deep), with low numbers of the teeth (about 30) on movable chelal finger; trichobothria it and et at same level.
Carapace (Fig. 20) smooth, with a total of 36 setae, including 6 on anterior margin and 8 on posterior margin; epistome small and triangular; 4 eyes, anterior pair with lens, posterior pair with weak lenses; lateral margins slightly convex.
Abdomen. Pleural membrane strongly granulate. Tergal chaetotaxy: 4: 12: 10: 10: 10: 10: 11: 11: 11: 10: 9, including at least 4 tactile setae on tergites VI-XI; anterior genital sternite (Fig. 27)   of femur with fine granulation; patella claviform, smooth; chelal fingers long and slender. Trichobothriotaxy: est, et and it grouped together distally; ist situated midway between isb and it, nearer to it than to isb. eb and esb situated on base of the hand, grouped very closely with ib and isb; b and sb closer to each other situated on the basal half, and st and t closer to each other situated on the distal half of the movable finger. Fixed chelal finger with 63 pointed teeth of unequal length, movable finger with about 30 teeth which with 20 pointed teeth slightly unequal length in distal half, and 10 rounded teeth in basal half.