Pristidia cervicornuta Yu, Zhang & Chen, 2017

Zhang, Jianshuang, Yu, Hao & Zhong, Yang, 2020, Redescription of Pristidia cervicornuta (Araneae, Clubionidae), with a first description of the female, ZooKeys 914, pp. 33-42 : 33

publication ID	https://dx.doi.org/10.3897/zookeys.914.46909
publication LSID	lsid:zoobank.org:pub:4BDF3A06-5141-4FDD-8C43-0301105A86DA
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scientific name	Pristidia cervicornuta Yu, Zhang & Chen, 2017
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Pristidia cervicornuta Yu, Zhang & Chen, 2017 Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5

Pristidia cervicornuta Yu, Zhang & Chen, 2017: 413, f. 18 (♂).

Material examined.

CHINA • 17♀(MGEU-PRI-18-001~017) and 15♂ (MGEU-PRI-18-018~032) Hainan Province, Diaoluo Mountains Nature Reserve, Taiping farm; 18°48'15.22"N, 109°52'8.94"E; 380 m; beating of bush, 15 Apr. 2018, Qian Yu leg.; • 2♂ (Types); same locality; 18°48'12.16"N, 109°52'5.42"E; 6 Oct. 2009, Hao Yu and Zhenyu Jin leg; beating of shrubs.

Diagnosis.

Females of P. cervicornuta are similar to those of P. ramosa (the other only Pristidia species in China: Yu et al. 2012: 45, figs 9-11, 15-16) by the epigynal plate having 2 clefts situated at the posterior margin; they also resemble those of P. secunda ( Deeleman-Reinhold 2001: 186, figs 191, 192) in the general shape of the vulva, but can be differentiated from P. ramosa by lacking atrium (Fig. 2A, B, E View Figure 2 ) (vs. atrium present in P. ramosa ), and can be easily distinguished by the indistinct insemination ducts (Fig. 2C, D, F View Figure 2 ) (vs. long insemination ducts in P. ramosa and P. secunda ), and by the copulatory openings located in the middle of the epigynal plate (Fig. 2A, B, E View Figure 2 ) (located on posterior margin in P. ramosa and P. secunda ). Males of P. cervicornuta can be easily recognized by the distally forked, antler-shaped retrolateral tibial apophysis and by the thick, semitransparent, thumb-shaped tegular apophysis.

Description.

Female (MGEU-PRI-18-001) (Fig. 1A-C View Figure 1 ). Total length 5.25; carapace 1.90 long, 1.29 wide; abdomen 3.21 long, 1.65 wide.

Carapace yellow, without distinct pattern. Fovea red. In dorsal view, anterior eye row (AER) slightly recurved, posterior eye row (PER) almost straight, PER wider than AER. Eye sizes and interdistances: anterior median eyes (AME) 0.07, anterior lateral eyes (ALE) 0.05, posterior median eyes (PME) 0.10, posterior lateral eyes (PLE) 0.06; distance between AMEs (AME-AME) 0.02, distance between AME and ALE (AME-ALE) 0.04, distance between PMEs (PME-PME) 0.13, distance between PME and PLE (PME-PLE) 0.04. Length of median ocular quadrangle (MOQ) 0.26, MOQ anterior width 0.20, MOQ posterior width 0.38. Chelicerae protruding and robust, with long and red wine-coloured fangs, with 3 teeth on promargin and 2 on retromargin. Labium and endites brown. Sternum 1.06 long, 0.71 wide.

Abdomen lanceolate, white, with inconspicuous anterior tufts of sparse hairs, dorsum without pattern; venter white, with several pairs of inconspicuous muscular dots.

Legs uniformly light yellow. Leg length: I 5.13 (1.28, 0.71, 1.75, 0.93, 0.46), II 5.11 (1.43, 0.67, 1.69, 0.81, 0.51), III 4.23 (0.97, 0.49, 1.12, 1.21, 0.44), IV 5.85 (1.57, 0.49, 1.51, 1.75, 0.52).

Epigyne (Fig. 2B-F View Figure 2 ). Epigynal plate slightly shorter than wide, margin not rebordered; posterior margin concaved in the middle, forming shallow depression; 2 clefts located at lateral borders of the depression; copulatory openings distinct and heavily sclerotised, located in the middle of the plate. Insemination ducts short and indistinct; spermathecae located anteriorly; spermathecal head small tubercle-like, located on lateral side of spermatheca; bursal surface hyaline, wrinkled and ribbed, inside pigmented and sclerotised; both spermathecae and bursae are subglobular; acicular fertilisation ducts located on the dorso-lateral sides of spermathecae.

Male (MGEU-PRI-18-008) (Fig. 1D-F View Figure 1 ). Total length 4.06; carapace 1.62 long, 1.28 wide; abdomen 2.25 long, 0.94 wide. Eye sizes and interdistances: AME 0.08, ALE 0.08, PME 0.11, PLE 0.09; AME-AME 0.04, AME-ALE 0.03, PME-PME 0.13, PME-PLE 0.05. MOQL 0.24, MOQA 0.18, MOQP 0.36. Sternum 0.91 long, 0.66 wide. Measurements of legs: I 5.38 (1.26, 0.45, 1.92, 1.16, 0.59), II 5.33 (1.56, 0.45, 1.73, 1.12, 0.47), III 4.39 (1.47, 0.45, 0.76, 1.21, 0.51), IV 6.27 (1.72, 0.54, 1.61, 1.87, 0.54). General characters as in female, but slightly smaller in size and darker in colour.

Palp (Fig. 3A-F View Figure 3 ). See Yu et al. (2017).

Comments.

There is almost no difference between the holotype male (Fig. 4A-F View Figure 4 ) and the newly collected male specimen in the present study. However, two characters of the bulb were not presented in the original description. Additionally, some spines and hairs are lost in holotype male (Fig. 4A-C View Figure 4 ). Consequently, a fuller description is provided here: the tegular hump (TH) is represented by an enlarged flange, hidden behind the embolus (E) and tegular apophysis (TA); a translucent flakelet (F) located at distal-retrolateral position of tegulum (T) (approximately 1 o’clock of tegulum), the flake is subtriangular with a membranous and blunt apex; the tibia has two long dorsal spines (TS) originating from trisection; the femur bears two short dorsal spines (FS) originating from its proximal part.

Natural history.

Pristidia cervicornuta inhabits forest located in low elevation areas on Mt. Diaoluo. The male holotype was obtained from shrubs in a rubber-tea artificial community and the new materials were collected by beating twigs and branches of bush in an elm forest.

Distribution.

Known only from the type locality, Mt. Diaoluo, Hainan, China (Fig. 5 View Figure 5 ).