Bucliona jucunda ( Karsch, 1879 ) Zhang & Marusik & Oketch & Kioko & Yu & Li, 2021

Zhang, Jianshuang, Marusik, Yuri M., Oketch, Ambata D., Kioko, Esther N., Yu, Hao & Li, Shuqiang, 2021, Resurrection of the spider genus Bucliona Benoit, 1977, with a description of a new species from Kenya (Araneae, Clubionidae), Zootaxa 5006 (1), pp. 195-207 : 198-203

Bucliona jucunda ( Karsch, 1879) comb. n.

Figs 2A‒B, D‒E , 3 , 4 , 7B, D

Liocranum jucundum Karsch, 1879: 92 .

Clubiona jucunda: Paik 1990: 71 , figs 28–39 (♂ ♀); Mikhailov 1995: 34 , figs 5, 14 (♂ ♀); Huang & Chen 2012: 67, figs 19A–F, pl. 5B–D, 6A–B, box 2H; Wang et al. 2018: 325 , figs 11A–F (♂ ♀).

Clubiona (Bicluona) jucunda : Mikhailov 1994: 54, figs 1–2 (♂ ♀).

For the complete list of taxonomic references see WSC (2021).

Material examined. CHINA: Hubei: Xiantao City, Shahu Town, Shishangang Village , Shahu National Wetland Park (N30.1588º, E117.7179º, 15 m), 2♂ 5♀ ( MGEU), February 2011, H. Yu. leg.

Diagnosis. Bicluona jucunda is similar to the generotype, B. dubia ( Mikhailov 1997: 96 , figs 1‒4). Males of the two species can be distinguished by the shape of the embolus and RTA. In B. jucunda , the embolus is filamentous, wraps around the tegulum, and the tip is directed antero-mesally, while in B. dubia , the embolus is shorter and stouter, Ƨ-shaped, and the tip is directed anteriorly (cf. Figs 3C–E , 7B and Mikhailov 1997 : fig. 1). The RTA in B. jucunda has a blunt tip vs. pointed in B. dubia (cf. Figs 3B , 7D and Mikhailov 1997 : fig. 2). Females of B. jucunda can be distinguished from those of B. dubia by the distinctly longer and strongly convoluted copulatory ducts ( Fig. 4B, D ) (vs. relatively shorter, see Mikhailov 1997 : fig. 4) and the smaller receptacles, less than 1/2 length and 1/3 width of epigynal fovea ( Fig. 4A–D ) (vs. comparatively larger, length subequal to fovea; see Mikhailov 1997 : figs 3, 4).

Description. Male. Total length 6.70; carapace 3.05 long, 2.20 wide; abdomen 3.65 long, 1.97 wide. Carapace ( Fig. 4E, F ) dark yellow with darkened eye region, without distinct pattern; cervical groove and radial grooves indistinct. Labium and endites dark reddish brown. Sternum yellow. Eyes: AER slightly recurved, PER wider than AER and straight in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.12, ALE 0.15, PME 0.12, PLE 0.14, AME–AME 0.16, AME–ALE 0.11, PME–PME 0.36, PME–PLE 0.22, MOQL 0.41, MOQA 0.40, MOQP 0.63. Legs yellowish, without distinct markings. Leg measurements: I 5.84 (1.53, 2.60, 1.05, 0.67), II 6.29 (1.83, 2.62, 1.12, 0.71), III 4.95 (1.46, 1.70, 1.26, 0.53), IV 6.94 (1.96, 2.37, 1.91, 0.70). Abdomen ( Figs 4E, F ), dorsally with a narrow scutum extending ca. 1/2 of abdomen length, gradually widening posteriorly, with two pairs of inconspicuous sigilla on either side; venter white with no distinct pattern.

Palp ( Figs 3A–E , 7B, D ): Tibia comparatively short, ca. 1/2 of cymbium length, ca. 1.7 times longer than wide, retrolateral tibial apophysis (RTA) about 1/4 of tibia length, about 1.5 times longer than wide, thumb shaped. Embolus filamentous, wrapping around dorsal side of tegulum, tip directed antero-mesally, base (EB) slightly shorter than free (filamentous) part of (E). Tegular apophysis (TA) originating from antero-retrolateral side of tegulum, semicircular, directed antero-mesally, distally curved postero-retrolaterally.

Female. ( Fig. 4G, H ): total length 6.50; carapace 2.88 long, 2.16 wide; abdomen 3.57 long, 2.20 wide. Eye sizes and interdistances: AME 0.12, ALE 0.14, PME 0.12, PLE 0.010, AME–AME 0.13, AME–ALE 0.15, PME–PME 0.38, PME–PLE 0.26, MOQL 0.39, MOQA 0.37, MOQP 0.57. Sternum 1.49 long, 1.01 wide. Leg measurements: I 4.99 (1.44, 2.112, 0.87, 0.571), II 5.54 (1.51, 2.31, 1.08, 0.64), III 4.50 (1.40, 1.54, 1.048, 0.51), IV 6.64 (1.75, 2.32, 1.90, 0.67). Slightly smaller and distinctly darker than male, other characters as in male.

Epigyne ( Figs 4A–D ): Epigynal plate distinctly longer than wide, anterior and lateral margin not rebordered, part of bursae and receptacles distinctly visible through plate. Epigynal fovea triangular, with rebordered margins, ca. 1/2 of epigyne length and 2/3 of epigyne width; both anterior (AH) and posterior hoods ( PH) heavily sclerotized. Copulatory openings (CO) small and indistinct, on posterior part of fovea. Copulatory ducts (CD) hyaline and strongly convoluted. Receptacles (R) small, bean shaped, ca. 1.9 times longer than wide. Bursae (BS) situated anteriorly, balloon shaped, relatively large, ca. 1.3 times longer than wide, anterior surface wrinkled; two bursae close together. Fertilisation ducts (FD) acicular and membranous, curved, on posterior surface of receptacles, separated from epigastric furrow by about 1/3 epigyne length.

Distribution. Russia (south part of the Far East), China (from Heilongjiang to Guizhou), Korea, Japan.

Figures

FIGURE 2. Somatic characters of Bucliona jucunda (A, B, D, E) and B. kirilli sp. n. (C, F): A, C male prosoma, frontal; B female prosoma, frontal; D male leg I, prolateral; E–F female leg I, prolateral. Arrows (A, C) point at mesal ridge of male chelicera; Arrows (D–F) point at scopula on the distal part of the tibia. Scale bars: 1 mm.

FIGURE 3. Left male palp of Bucliona jucunda. A–B prolateral and retrolateral; C–E bulb, prolateral, ventral, and retrolateral. Abbreviations: E, embolus; EB, embolic base; RTA, retrolateral tibial apophysis; ST, subtegulum; TA, tegular apophysis. Scale bars: 0.2 mm.

FIGURE 4. Epigyne (A–D) and somatic characters of Bucliona jucunda. A–B macerated epigyne, ventral and dorsal; C–D epigyne, macerated and embedded inArabic gum, ventral and dorsal; E–F male habitus, dorsal and lateral, arrows point to dorsal abdominal scutum; G–H female habitus, dorsal and ventral. Abbreviations: AH, anterior hood; BS, bursa; CD, copulatory duct (dashed line in D showing schematic course of copulatory duct, dorsal); CO, copulatory opening; FD, fertilisation duct; PH, posterior hood; R, receptacle. Scale bars: A–D 0.2 mm; E–H 2 mm.

FIGURE 7. Comparison of the male palp of Bucliona kirilli sp. n. (A, C) and B. jucunda (B, D). A–B ventral; C–D RTA, dorsoretrolateral. Abbreviations: E, embolus; RTA, retrolateral tibial apophysis; ST, subtegulum; TA, tegular apophysis. Scale bars: 0.2 mm.