Ibana svarnadvipa Dhiya’ulhaq & Benjamin sp. nov.

Figs 15, 16, 17

Epidius rubropictus Benjamin, 2011: 15, figs 5 I, 35 D, E (female from Sumatra only) [misidentification].

Type material.

Holotype. Indonesia – Jambi Province • 1 ♂; Batang Hari, Bajubang, Sungkai; 01°50'58.7"S, 103°18'00.5"E; elev. 56 m; 5 Jun. 2013; J. Drescher leg.; canopy fogging in jungle rubber plantation; GOET 2013_HJ 3.2_AraThom 035 N_001 (to be transferred to MZB) . Paratype. Indonesia – Jambi Province • 1 ♂; same data as holotype; ZMH ZMH -A 0031854 (GOET 2013_HJ 3.2_AraThom 035 N_002) . • 1 ♀; Sarolangun, Air Hitam, Lubuk Kepayang; 02°05'06.8"S, 102°47'20.9"E; elev. 70 m; 23 Jun. 2013; J. Drescher leg.; canopy fogging in rubber plantation; GOET 2013_BR 2.2_AraThom 035 N_001 (to be transferred to MZB) .

Diagnosis.

Males of Ibana svarnadvipa Dhiya’ulhaq & Benjamin, sp. nov., can be distinguished from Ibana gan Liu & S. Q. Li, 2022 and Ibana senagang Benjamin, 2014 by the slightly dorsally curved VTA (Figs 15 D, F, 17 B vs oblique with a flexed-back tip in I. senagang, Benjamin 2016: fig. 3 A; absent in I. gan, Zhong, Zheng & Liu, 2022: fig. 1 E – G) and roughly triangular conductor with long-tapering tip (Figs 15 E, 17 A vs triangular with abruptly narrowing tip in I. senagang; absent in I. gan). Females can be distinguished by the CO positioned at the posterior end of spermatheca (Fig. 17 C vs anterior to spermatheca in I. gan, at middle length of spermatheca in I. senagang Liu et al. 2022: figs 2, 3; Benjamin 2016: fig. 3 B, C). Additionally, both sexes are rather uniformly coloured yellowish brown, with a pair of red stripes that cross the eye region (Figs 15 A – C, 16 A, B vs abdomen with a large, dark median band I. gan, red cephalic stripes absent in both I. gan and I. senagang; Zhong, Zheng & Liu, 2022: figs 1 A, B, 2 A, B; Benjamin 2016: fig. 1 G).

Description.

Male (holotype 2013_HJ 3.2_AraThom 035 N_001; Figs 15, 17 A). Total length 3.54. Carapace length 1.56; width 1.51. Abdomen length 1.98; width 1.56. Diameter of eyes: AME 0.06; ALE 0.11; PLE 0.12; PME 0.09. Interdistances between eyes: AME – AME 0.07; AME – ALE 0.04; ALE – ALE 0.28; PME – PME 0.14; PME – PLE 0.12; ALE – PLE 0.11; AME – PME 0.19; PLE – PLE 0.53. Leg measurements: leg I 8.55 (2.21, 0.55, 2.45, 2.12, 1.22); leg II 8.95 (2.48, 0.54, 2.59, 2.10, 1.24); leg III 4.55 (1.38, 0.38, 1.26, 1.00, 0.53); leg IV 4.78 (1.47, 0.37, 1.33, 1.12, 0.49). Carapace pear shaped, yellow; cephalic region with a pair of diagonal red stripes that cross the ocular area; AER recurved; PER slightly recurved. Legs yellow, uniformly coloured. Abdomen oval, pale yellow. Palp (Figs 15 D – F, 17 A, B): cymbium 1.5 × the length of tibia. Conductor subtriangular; distal part tapering. Embolus long, filiform. Tibia with three strong macrosetae, prolateral to the VTA. VTA slightly dorsally curved; tip rounded.

Female (paratype 2013_BR 2.2_AraThom 035 N_001; Figs 16, 17 C, D). Total length 3.14. Carapace length 1.52; width 1.52. Abdomen length 1.62; width 1.26. Diameter of eyes: AME 0.05; ALE 0.11; PLE 0.12; PME 0.08. Interdistances between eyes: AME – AME 0.08; AME – ALE 0.05; ALE – ALE 0.29; PME – PME 0.15; PME – PLE 0.13; ALE – PLE 0.11; AME – PME 0.19; PLE – PLE 0.55. Leg measurements: leg I 7.72 (2.13, 0.58, 2.28, 1.78, 0.95); leg II 7.86 (2.27, 0.57, 2.28, 1.71, 1.03); leg III 4.08 (1.27, 0.42, 1.05, 0.86, 0.48); leg IV 4.18 (1.39, 0.38, 1.13, 0.94, 0.34). Female habitus as in male, except the carapace and abdomen is slightly darker in colour. Epigynum (Figs 16 C – E, 17 C, D): atrium longer than wide, posterior half bordered by a thin flap. CO hidden by aforementioned flap, positioned posterior to spermatheca. CD long, going around the inner side of spermatheca before joining at the anterior side. Spermatheca inverted pear-shaped. FD half of spermatheca length.

Etymology.

The specific epithet is taken from an ancient name for Sumatra, which is Sanskrit for ‘ island of gold’. Also referring to the colouration of the species in ethanol. Noun in apposition.

Distribution.

Indonesia (Sumatra: North Sumatra and Jambi Province) Fig. 29.