Poecilorchestes keciknyo, Dhiya’Ulhaq & Buchori & Scheu & Drescher, 2025

Poecilorchestes keciknyo Dhiya’ulhaq sp. nov.

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Figs 35–38 View Fig View Fig View Fig View Fig

Diagnosis

Males of Poecilorchestes keciknyo Dhiya’ulhaq sp. nov. can be distinguished from all those of other congeners by a bullet-shaped tegulum ( Fig. 36B, E View Fig ). Females can be distinguished from those of Poecilorchestes decoratus Simon, 1901 by posterior chambers of spermathecae positioned posterior to anterior chambers ( Fig. 38A, C View Fig vs posterior chambers parallel to anterior chambers [ Chrysanthus 1968: fig. 77]) and from those of Poecilorchestes zhengi Wang & Li, 2021 by having an epigynal hood anterior to spermathecae ( Fig. 38A–C View Fig vs in between anterior and posterior chamber of spermathecae in P. zhengi [ Wang & Li 2021: fig. 15a]) and anterior chambers of spermathecae slightly smaller than posterior chambers (vs anterior chamber much larger than posterior chamber in P. zhengi ).

Etymology

The specific epithet is taken from the Jambi Malay word ‘ keciknyo ’ meaning ‘so small’, referring to the minute size of this species. Noun in apposition.

Material examined

Holotype

INDONESIA – Jambi Province • ♂; Sarolangun, Pauh, Semaran ; 2°08′35.9″ S, 102°51′04.5″ E; elev. 45 m; 16 Jul. 2013; J. Drescher leg.; canopy fogging in jungle rubber plantation; GOET 2013_ BJ5.1_AraSalt005N_001 (to be transferred to MZB). GoogleMaps

Paratypes

INDONESIA – Jambi Province • 1 ♂, 2 ♀♀; same data as for holotype; GOET 2013_BJ5.1_ AraSalt005N_002 to GOET 2013_BJ5.1_AraSalt005N_004 (to be transferred to MZB) GoogleMaps • 1 ♂, 1 ♀; Sarolangun, Bukit Duabelas National Park ; 1°59′42.6″ S, 102°45′08.0″ E; elev. 69 m; 8 Oct. 2013; J. Drescher leg.; canopy fogging in rainforest; ZMH ZMH-A0031831 , GoogleMaps ZMH-A0031832 GoogleMaps • 1 ♂; Sarolangun, Air Hitam, Desa Baru ; 2°00′56.8″ S, 102°45′12.6″ E; elev. 64 m; 14 Jul. 2013; J. Drescher leg.; canopy fogging in jungle rubber plantation; ZMH ZMH-A0031833 GoogleMaps .

Description

Male ( Figs 35–36 View Fig View Fig )

MEASUREMENTS. Total length 1.48. Carapace length 0.72; width 0.68. Opisthosoma length 0.76; width 0.74. Diameter of eyes: AME 0.19; ALE 0.10; PLE 0.07. Interdistances between eyes: ALE–ALE 0.43; ALE–PLE 0.17; PLE–PLE 0.58. Clypeus height 0.02. Leg measurements: leg I 1.11 (0.37, 0.21, 0.24, 0.15, 0.14); leg II 0.79 (0.28, 0.15, 0.13, 0.10, 0.13); leg III 0.69 (0.25, 0.09, 0.11, 0.09, 0.15); leg IV 0.84 (0.32, 0.09, 0.14, 0.11, 0.18).

HABITUS AND COLORATION. Carapace box-shaped, reddish-brown. Chelicerae red; dentition: two promarginal, one bicuspid retromarginal. Opisthosoma round, slightly flattened dorso-ventrally; covered in light-brown scutum over whole dorsal surface; rest of opisthosoma and spinnerets pale. Legs rather short and thick; leg I stouter than other legs; most of legs dark-brown except tarsi, metatarsi II–IV and tibiae III–IV. Flattened, iridescent scales covering dorsal and frontal surface of carapace, dorsal and posterior-lateral surface of opisthosoma, as well as anterior legs and pedipalp. Spinnerets light brown, tip pale.

PALP ( Fig. 36 View Fig ). Tibia length-to-width ratio 1.30, dorsally covered in iridescent scales. Cymbium subtriangular. Tegulum bullet-shaped with slightly oblique, truncated base. Sperm duct following margins of tegulum, starting out broad, becoming narrow starting from posterior margin of bulb. Embolus curved, starting out from broad base, approximately half as long as tegulum. RTA absent.

Female ( Figs 37–38 View Fig View Fig )

MEASUREMENTS. Total length 1.54. Carapace length 0.72; width 0.65. Opisthosoma length 0.82; width 0.73. Diameter of eyes: AME 0.20; ALE 0.10; PLE 0.07. Interdistances between eyes: ALE–ALE 0.42; ALE–PLE 0.20; PLE–PLE 0.58. Clypeus height 0.01. Leg measurements: leg I 0.99 (0.32, 0.19, 0.21, 0.11, 0.16); leg II 0.81 (0.27, 0.15, 0.15, 0.10, 0.14); leg III 0.71 (0.25, 0.09, 0.12, 0.10, 0.15); leg IV 0.88 (0.34, 0.09, 0.15, 0.12, 0.18).

HABITUS AND COLORATION. Female habitus as in male, except part of opisthosoma not covered in scutum dark-gray.

EPIGYNUM ( Fig. 38 View Fig ). Epigynal plate oval, wider than long. Copulatory openings small, separated from each other by approximately width of posterior spermathecal chambers. Copulatory ducts, as long as anterior spermathecal chambers. Epigynal hood located anteriorly. Spermatheca two-chambered; anterior chambers oval; posterior chambers oval, slightly larger than anterior chambers and positioned posterior to them; distance between anterior chambers larger than distance between posterior chambers. Fertilization ducts arising from anterior end of posterior spermatheca, diagonally oriented.

Distribution

Sumatra: Jambi Province.

Natural history

All specimens were collected by canopy fogging in rainforests and jungle rubber plantations and are considered arboreal.