On further species of the spider genus Clubiona Latreille, 1804 (Araneae, Clubionidae) from Xishuangbanna Rainforest, southwestern China Author Yu, Hao School of Biological Sciences, Guizhou Institute for Integrated Mountain Research, Guizhou Education University, Guiyang 550018, China Author Li, Shuqiang Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China lisq@ioz.ac.cn text Zootaxa 2019 2019-10-02 4679 2 201 230 journal article 22535 10.11646/zootaxa.4679.2.1 353d2aa4-018e-4701-8f81-4707260dfefc 1175-5326 3772397 FF25178E-7343-4544-9C70-BEA506A4CD99 Clubiona jiandan sp. nov. Figs 19–20 Type material. Holotype : ♂ ( IZCAS Ar 34720), CHINA : Yunnan : Xishuangbanna , Mengla County , Menglun Town , Menglun Nature Reserve , Secondary tropical montane evergreen broad-leaved forest ( N21º57.784' , E101º11.947' , 895 m ), 6 August 2007 , leg. G. Zheng (Fogging-CBI) . Paratypes : CHINA : Yunnan : Xishuangbanna , Mengla County , Menglun Town , Menglun Nature Reserve : 1♂ , 1♀ ( IZCAS Ar 34721–34722), Secondary tropical montane ever- green broad-leaved forest ( N21º57.809' , E101º12.173' , 888 m ), 4 August 2007 , leg. G. Zheng (Fogging-CBIII) ; 1♀ ( IZCAS Ar 34723), Secondary tropical montane evergreen broad-leaved forest ( N21º57.767' , E101º12.431' , 880 m ), 6 August 2007 , leg. G. Zheng (Fogging-CBII) . Etymology. The specific name is derived from the Chinese pinyin 'jian dan', which means 'simple', referring to the simple genital bulb and the weakly developed tibial apophysis; adjective. Diagnosis. Males of Clubiona jiandan sp. nov. resembles those of C. yaoi Yu & Li, 2019 ( Yu & Li 2019a: 152 , figs 1A–E; 2A–H) in having a simple palpal bulb with U-shaped sperm duct, transparent, lamelliform conductor, and short embolus ( Figs 19 C–E), but differ by: (1) tibia only with retrolateral apophysis ( Fig. 19B ) (with three apophyses in C. yaoi ); (2) retrolateral tibial apophysis unbranched, small and weakly developed ( Fig. 19B ) (retrolateral tibial apophysis distally forked and well developed in C. yaoi ); (3) dorsal cymbial apophysis absent ( Figs 19 A–B); (4) embolus cone-shaped and partly membranous ( Figs 19 C–E) (embolus spiniform in C. yaoi ). Females also resemble those of C. yaoi by the general shape of vulva but can be recognized by the oval spermathecae ( Figs 20 B–D) (globular in C. yaoi ), and by the globular bursae ( Figs 20 B–D) (oblong in C. yaoi ). Taxonomic remarks. Clubiona jiandan sp. nov. possesses several characters associated with the apiculata - group and resembles C. yaoi (the only apiculata -group species recorded from China ) for their characteristic genital organs (for a detailed diagnosis, see above). The males of the apiculata -group (known for C. yaoi and four apiculata group species from Borneo reported by Dankittipakul & Singtripop 2014 ) share the following distinctive suite of characters, here contrasted with the corresponding condition in this new species: (1) the presence of the tubercle at dorsal cymbium ( C. jiandan sp. nov. : dorsal cymbial apophysis absent, Figs 19 A–B); (2) males with at least two palpal tibial apophyses, the retrolateral one usually well-developed ( C. jiandan sp. nov. : tibia only with retrolateral apophysis, RTA small, simple and weakly developed, Fig. 19B ). Female closely resembles those of the apiculata - group, in possessing a vulva with ascending copulatory ducts connected to bursae at mid length between copulatory openings and spermathecae, and a pair copulatory ducts lacking convolution. In addition, this new species can be separated from existing members of the apiculata -group by number of ventral spines in tibia I and II, namely two pairs in C. jiandan sp. nov. , but three pairs in known apiculata -group species. Nevertheless, considerable uncertainty about placing this new species in the apiculata -group remains. Despite the fact that the general shape of palpal bulb and vulva of Clubiona jiandan sp. nov. is fairly typical of a member of the apiculata -group, it is currently impossible to discern any obvious derived features (i.e., well-developed RTA) that could indicate a close relationship to the apiculata -group. FIGURE 19. Clubiona jiandan sp. nov. , male holotype: A–B, flipped right palp (A prolateral view; B retrolateral view); C–E, left palpal bulb (C prolateral view; D ventral view; E retrolateral view). Abbreviatures: C, conductor; E, embolus; EB, embolic base; RTA, retrolateral tibial apophysis. Scale bars: 0.10 mm (A–B, C–E in the same scale). FIGURE 20. Clubiona jiandan sp. nov. , male holotype (E–F) and female paratype (A–D, G–H): A–B, epigyne, ventral view (A uncleared; B cleared); C–D, vulva, dorsal view (C cleared; D cleared and embedded in Arabic gum); E–H, habitus (E, G dorsal view; F lateral view; H ventral view). Abbreviatures: BS, bursa; CD, copulatory duct; CO, copulatory opening; FD, fertilization duct; SH, spermathecal head; SP, spermatheca. Scale bars: 0.10 mm (A–D in the same scale); 1 mm (E–F, G–H in the same scale). Description. Male ( holotype ): Total length 3.55; prosoma 1.74 long, 1.17 wide; opisthosoma 1.76 long, 0.96 wide. Prosoma ( Figs 20 E–F), oval, pars cephalica slightly narrowed, widest between coxae II and III, in profile slightly higher just behind longitudinal fovea, gradually sloping towards pars cephalica; integument smooth, clothed with numerous short fine hairs. Carapace yellowish-orange, without distinct color pattern; fovea reddish. Chelicerae protruding and orange, with five promarginal and three retromarginal teeth. Labium and endites yellowish-orange, longer than wide. Sternum yellowish. Eyes: both AER and PER straight in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.11, ALE 0.11, PME 0.14, PLE 0.11, AME–AME 0.04, AME–ALE 0.02, PME–PME 0.02, PME–PLE 0.08, MOQL 0.14, MOQA 0.16, MOQP 0.32. Legs yellowish-white, without distinct color markings. Leg formula: IV, I, II, III; leg measurements: I 4.23 (1.27, 1.75, 0.76, 0.44), II 3.51 (0.99, 1.49, 0.66, 0.37), III 2.94 (0.88, 1.03, 0.75, 0.28), IV 4.52 (1.36, 1.55, 1.22, 0.38). Opisthosoma ( Figs 20 E–F) elongate-oval, yellowish-white, dorsum without color marking; venter white; all spinnerets without distinct color marking. Palp ( Figs 19 A–E): Tibia short, with single retrolateral apophysis; RTA small and flat, triangular; genital bulb elongated, with a relatively flat tegulum, sperm duct distinct, U-shaped; embolus, a small cone, originating from apical, prolateral side of tegulum, apex points ventrally; conductor represented by a transparent lamina, originating on apical, retrolateral area of tegulum. Female ( paratype IZCAS Ar 34723): Total length 4.08; prosoma 1.45 long, 1.16 wide; opisthosoma 2.55 long, 1.38 wide. Not strikingly different from males but slightly darker in color ( Figs 20 G–H). Eye sizes and interdistances: AME 0.13, ALE 0.09, PME 0.11, PLE 0.09, AME–AME 0.03, AME–ALE 0.03, PME–PME 0.19, PME–PLE 0.05, MOQL 0.13, MOQA 0.13, MOQP 0.31. Legs yellowish-white, without distinct color markings. Leg formula: IV, II, I, III; leg measurements: I 2.84 (0.72, 1.28, 0.48, 0.37), II 2.97 (0.93, 1.13, 0.57, 0.33), III 2.74 (0.82, 0.92, 0.68, 0.32), IV 3.88 (1.17, 1.32, 1.08, 0.32). Epigyne ( Figs 20 A–D): Epigynal plate longer than wide, posterior margin concaved in the middle; atrium absent; spermathecae, bursae and copulatory ducts prominently visible through epigynal plate in ventral view; two copulatory openings distinctive and large, located at postero-lateral portion of epigynal plate; copulatory ducts ascending anteriorly, connect with spermathecae; spermathecae oval, basolaterally with digitiform head; bursae globular, connected to copulatory ducts at mid length between copulatory openings and spermathecae; fertilization ducts acicular, membranous, located on dorsal-lateral surface of spermathecae. Distribution . Presently known only from the type locality.