Clubiona jiandan Yu & Li 2019, sp. nov.
Creators: name: Yu, Hao
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Clubionidae
Clubiona
Clubiona jiandan

description: 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.
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.
description: Published as part of Yu, Hao & Li, Shuqiang, 2019, On further species of the spider genus Clubiona Latreille, 1804 (Araneae, Clubionidae) from Xishuangbanna Rainforest, southwestern China, pp. 201-230 in Zootaxa 4679 (2) on pages 226-229, DOI: 10.11646/zootaxa.4679.2.1, http://zenodo.org/record/3772397