Clubiona octoginta Dankittipakul

Dankittipakul, Pakawin & Singtripop, Tippawan, 2008, Five new species of the spider genus Clubiona Latreille (Araneae: Clubionidae) from Thailand, Zootaxa 1747, pp. 34-60 : 39-41

Clubiona octoginta Dankittipakul sp. n.

( Figs 1 , 15–19 , 41–47 )

Type material: Holotype: ɗ, Pha Tam National Park [Khong Chiam District, Ubon Ratchathani Province, Northeastern Thailand], deciduous forest, 250 m, 15.–20.xi.2006, P. Dankittipakul ( MHNG).

Paratypes: 3ɗ, 2Ψ, same data as holotype ( MHNG, TNHM).

Etymology. The specific epithet is a Latin numeral meaning eighty. This new species is named in honor of His Majesty King Bhumibol Adulyadej the Great of Thailand who has served his country with indefatigable dedication. His Majesty is the longest-ruling monarch in Thailand's history and the longest-reigning ruler in the world. This new species is described to commemorate the celebrations on the most auspicious occasion of His Majesty the King’s 80th Birthday Anniversary on December 2007.

Diagnosis. Clubiona octoginta sp. n. is closely related to C. campylacantha sp. n. Although differences between them on the basis of genitalia are mostly trivial, they are not conspecific and represent distinct species. Clubiona octoginta sp. n. is easily separable in having different opisthosomal color pattern ( Fig. 41 vs. Fig. 34 ). The conical embolus of C. octoginta sp. n. is more reduced and the triangular retrolateral tibial apophysis is apparently shorter and broader at base compared to that of C. campylacantha sp. n. Clubiona octoginta sp. n. is also more slender than C. campylacantha sp. n., which is relatively large and stoutly built species. The separate status of C. octoginta sp. n. is further justified by differences in female genitalia. In C. octoginta sp. n., the spermathecal head is provided with pear-shaped terminal apparatus ( Fig. 19 ). In contrast, this structure represents a short, digitiform tubercle in the females of C. campylacantha sp. n. ( Fig. 14 ). The female of C. octoginta sp. n. also resembles that of C. scandens known from Borneo in similar pattern of the vulva in which the spermathecal heads are indistinct although the terminally dilated trigonal apparatuses are conspicuously enlarged ( Figs 19 , 47 ; see also Deeleman-Reinhold 2001: figs 58–59). The most obvious difference is the shape of epigynal atrium, which in C. scandens can be recognized by the columnar depression with indistinct anterior atrial margin. Also, the terminal portions of spermathecal heads are much bigger in C. scandens than in C. octoginta sp. n., covering most anterior part of the vulva but hidden behind the spermathecal heads in this new species ( Fig. 18 ).

Description. Male (holotype): Total 5.4; prosoma 2.4 long, 1.7 wide; opisthosoma 3.0 long, 1.5 wide. Prosoma ( Fig. 41 ). Ovoid, pars cephalica relatively broad, in profile slightly higher behind longitudinal fovea; integument smooth. Carapace yellow, anteriorly brown, a pair of Y-shaped purplish markings starting from behind PME and PLE almost reaching dark reddish fovea. Chelicerae dark brown, dorsally with dark pattern. Labium and endites pale brown. Sternum pale yellow.

Eyes. Eyes with black rings and surrounded by purplish markings. Eye sizes and interdistances: AME 0.11, ALE 0.11, PME 0.11, PLE 0.11, AME–AME 0.11, AME–ALE 0.06, PME–PME 0.28, PME–PLE 0.18; MOQ: 0.28 long, 0.36 anterior width, 0.51 posterior width.

Legs. Yellow, femora with dark brown ventral band; tibiae with dark distal and proximal annuli; anterior metatarsi with distal dark band; tarsi brown. Leg formula 4213.

Leg measurements:

I II III IV

Femora 1.40 1.55 1.32 1.60

Patellae + tibiae 1.86 1.95 1.45 1.91

Metatarsi 0.85 0.95 1.20 1.64

Tarsi 0.53 0.55 0.50 0.51

Total 4.64 5.00 4.47 5.66

Opisthosoma ( Fig. 41 ). Elongate-oval; dorsum yellow, with broken dark median band, reaching half opisthosoma length; a pair of broken lateral bands fused posteriorly; venter pale, without markings.

Male palp ( Figs 15–16 , 42–44 ). Retrolateral tibial apophysis trigonal, distinctly broad at base, its apex sharply pointed. Cymbium longer than wide, slightly excavated dorso-apically. Bulb oval, with indistinct anterio-proapically membranous portion; sperm duct sinuate, forming a double loop. Embolus represented by short, triangular tubercle, broad at base, gradually tapering toward its apex, apico-prolaterally fused with curved conductor.

Female (paratype): Total length 5.9; prosoma 2.2 long, 1.6 wide; opisthosoma 3.7 long, 2.2 wide. Resembling the males but slightly larger in size ( Fig. 1 ); prosoma narrowed in cephalic area; dorsal shield of prosoma with indistinct color marking; dorsum of opisthosoma with pattern less defined.

Eyes. Eyes with black rings and surrounded by purplish markings. Eye sizes and interdistances: AME 0.10, ALE 0.10, PME 0.11, PLE 0.10, AME–AME 0.06, AME–ALE 0.03, PME–PME 0.23, PME–PLE 0.11; MOQ: 0.28 long, 0.31 anterior width, 0.46 posterior width.

Legs. Leg measurements:

I II III IV

Femora 1.30 1.40 1.23 1.54

Patellae + tibiae 1.82 1.95 1.46 1.90

Metatarsi 0.88 0.92 1.20 1.70

Tarsi 0.51 0.53 0.46 0.55

Total 4.51 4.77 4.35 5.69

Epigyne and vulva ( Figs 17–19 , 45–47 ). Anterior epigynal atrium trapezoid, margin rebordered, anterior atrial margin straight. Genital orifices situated on posteriorlateral part of the atrium. Spermathecal stalks short; spermathecal head with triangular terminal apparatus carrying numerous minute pores on its anterior portion; spermathecal bases elongated tubular, encircling small fertilization ducts. Membranous bursae rounded, situated posterior to the spermathecae.

Natural history. The type specimens were collected from dry deciduous forests. They were all obtained from a Malaise trap in November. The national park is predominately covered with dry dipterocarp forests.

Distribution. Known only from the type locality, Pha Tam National Park, northeastern Thailand ( Fig. 69 ).

Figures

FIGURE 1. Clubiona suthepica sp. n., female paratype.

FIGURE 69. Records of Clubiona species treated in the present study: * C. filicata; C. suthepica sp. n.; C. melanosticta; C. octoginta sp. n.; C. campylacantha sp. n.; Ο C. filifera sp. n.; C. abnormis sp. n.

FIGURES 11 – 19. Clubiona campylacantha sp. n., male holotype (11, 12) and female paratype (13, 14). 11 male palp, dorsal; 12 ditto, retrolateral; 13 epigyne, ventral; 14 dilated terminal apparatus of spermathecal heads. Clubiona octoginta sp. n., male holotype (15, 16) and female paratype (17 – 19). 15 male palp, dorsal; 16 ditto, retrolateral; 17 epigyne, ventral; 18 vulva, dorsal; 19 dilated terminal apparatus of spermathecal heads. Scale bars = 0.1 mm (11 – 13, 15 – 18).

FIGURES 41 – 47. Clubiona octoginta sp. n., male holotype (41 – 44) and female paratype (45 – 47). 41 habitus, dorsal; 42 male palp, ventral; 43 ditto, prolateral; 44 ditto, retrolateral; 45 epigyne, ventral; 46 left part of epigyne in lactic acid, ventral; 47 right part of vulva, dorsal. Scale bars = 1.0 mm (41); 0.1 mm (42 – 47).

FIGURES 34 – 40. Clubiona campylacantha sp. n., male holotype (34 – 37) and female paratype (38 – 40). 34 habitus, dorsal; 35 male palp, ventral; 36 ditto, prolateral; 37 ditto, retrolateral; 38 epigyne, ventral; 39 right part of epigyne in lactic acid, ventral; 40 right part of vulva, dorsal. Scale bars = 1.0 mm (34); 0.1 mm (35 - 40).