Revision of the spider genus Jacaena Thorell, 1897, with descriptions of four new species from Thailand (Araneae: Corinnidae) Author Dankittipakul, Pakawin Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand; & Manukau Institute of Technology, Manukau, New Zealand; Author Tavano, Maria Museo Civico di Storia Naturale ‘ Giacomo Doria’, Genova, Italy Author Singtripop, Tippawan Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand; text Journal of Natural History 2013 2013-04-29 47 23 - 24 1539 1567 http://dx.doi.org/10.1080/00222933.2012.763059 journal article 55811 10.1080/00222933.2012.763059 dfc793f4-7033-4586-9849-718e7e526360 1464-5262 556127 97EFA23C-7537-4156-8EF0-2D38CF889F5B Jacaena angoonae sp. nov. ( Figures 2D , 7E , 8E , 14A–C ) Type material Holotype : ♀ , Thailand : Huay Nam Dang NP , joint border between Mae Taeng District of Chiang Mai Province and Pai District of Mae Hong Son Province , Doi Chang , evergreen hill forest , 1930 m , extraction of soil sample , 4 June 1983 , P.J. Schwendinger leg. ( MHNG , PDC 4650). Paratypes : Same data as holotype, 3♀ (NHML & THNM, PDC 4651) . Diagnosis Females of this new species bear very close resemblance to those of J. schwendingeri comb. nov. in having large, medially situated copulatory orifices, and similar shape of spermathecae. However, in J. angoonae sp. nov. the copulatory orifices are teardrop-shaped ( Figure 7E ) and the insemination ducts are tubular without any modification ( Figure 8E ) whereas in J. schwendingeri comb. nov. the orifices are subcircular ( Figure 7A ) and the median part of the ducts is greatly enlarged ( Figure 8F ). Etymology The specific epithet is an eponymous patronym (genitive form of a noun) dedicated to Dr Angoon Lewvanich, a prolific Thai taxonomist. Figure 14. Jacaena angoonae sp. nov. , holotype, female (A–C); J. peculiaris sp. nov. , holotype, female (D, E). Epigyne, ventral (A, D). Internal copulatory organ, dorsal (B, E). Proximal part of insemination duct (C). Description Female ( holotype ). Total length 7.5. Carapace 3.0 long, 2.4 wide. Opisthosoma 4.5 long, 2.6 wide. Eye sizes and interdistances: AME 0.10; ALE 0.13; PME 0.08; PLE 0.11; AME–AME 0.06; AME–ALE 0.05; PME–PME 0.13; PME–PLE 0.16. MOQ 0.36 long; front width 0.28; back width 0.33. Leg formula 4123. Spination. Leg I: femur 1–1pl; tibia 8pl 8rl; metatarsus 4pl 4rl. Leg II: tibia 7pl 6rl; metatarsus 4pl 4rl. Leg III: tibia 1–1–1v 1pl; metatarsus 1–1v 1pl. Leg IV: tibia 1–1–1–1–2v 1–1rl; metatarsus 1–1– 1v 1pl 1rl. Leg measurements: Leg I 8.6 (2.5, 1.0, 2.3, 1.85, 1.0); II 7.7 (2.2, 0.9, 1.9, 1.7, 1.0); III 6.1 (1.7, 0.8, 1.4, 0.85); IV 9.2 (2.5, 1.0, 2.1, 2.4, 1.2). Colouration and pattern ( Figure 2D ): Carapace dark chestnut-brown; integument coarsely granulated. Chelicerae, sternum, labium and gnathocoxae dark reddishbrown; coxae, trochanters and femora dark brown; patellae and tibiae brown, tibiae orange distally; metatarsi and tarsi I–II light brown, III–IV orange. Opisthosoma ovoid; dorsum with pattern consisting of paired, oblique patches, followed by three chevrons on dark grey background. Figure 15. Jacaena distincta , holotype, female (MSNG). Museum label (A). Original label by Thorell (B). Habitus, dorsal (C). Ditto, ventral (D). Epigyne, partially removed (E). Copulatory organ ( Figures 7E , 8E , 14A–C ): Copulatory orifices teardrop-shaped ( Figure 14A ). Insemination ducts elongated, loosely coiled ( Figure 14B ); proximal duct connected to copulatory orifice semi-transparent ( Figure 8E ), forming sigmoid arch; secretory ampullae situated on posterior surface of proximal ducts; distal half of duct ascending anteriorly then descending posteriorly to connect with spermathecae. Spermathecae elliptical, anterior part distinctly enlarged, more or less spherical with glandular pore ( Figure 14B ). Male . Unknown. Natural history Jacaena angoonae sp. nov. inhabits evergreen hill forest of Doi Chang ( 1930 m ). This new species marks the highest altitudinal record among members of the genus Jacaena . Distribution Known only from the type locality, Mae Hongson Province , northern Thailand .