Pengmarengo gepeng Dhiya’ulhaq sp. nov.

urn:lsid:zoobank.org:act: 88022A02-9043-4F4F-8F01-FB2416BF0D5E

Figs 21–24

Diagnosis

Pengmarengo gepeng Dhiya’ulhaq sp. nov. is most similar to Pengmarengo chelifer (Simon, 1900) and Pengmarengo yui (Wang & Li, 2020), but males can be distinguished from those of P. chelifer by the presence of an anterior-lateral process on tegulum (Fig. 22B–E vs absent in P. chelifer [Benjamin 2004: fig. 25a; Wanless 1978: fig. 9b, e]); from those of P. yui by a rhombic-shaped tegulum (Fig. 22B, D vs oval in P. yui [Wang & Li 2020: fig. 5b–d]). Females can be distinguished from those of P. chelifer by having two small coils on the posterior part of copulatory ducts (Fig. 24B, D vs one coil in P. chelifer [Benjamin 2004: fig. 26b–c]) and circular copulatory openings (vs oval in P. chelifer); from those of P. yui by spermathecae having rounded bend (Fig. 24B–C vs sharp bend in P. yui [Wang & Li 2022: fig. 11b–c]) and oval copulatory openings (vs almost semi-circular in P. yui). Additionally, both males and females of P. gepeng lack paired white spots on the opisthosoma vs present in P. chelifer (Benjamin 2004: fig. 25d) and P. yui (Wang & Li 2020: fig 6a–b; 2022: fig. 11d–f), as well as paired spots of white setae and distinct thoracic protuberance on carapace of P. yui .

Etymology

The specific epithet is taken from the Indonesian word ‘ gepeng ’, which can be translated to ‘sprawl’ or ‘flat’, referring to the flat body of this species. Noun in apposition.

Material examined

Holotype

INDONESIA – Jambi Province • ♂; 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; GOET 2013_ BF1.1_AraSalt007N_001 (to be transferred to MZB).

Paratype

INDONESIA – Jambi Province • 1 ♀; Sarolangun, Bukit Duabelas National Park; 1°56′30.8″ S, 102°34′50.6″ E; elev. 91 m; 4 Oct. 2013; J. Drescher leg.; canopy fogging in rainforest; GOET 2013_ BF4.1_AraSalt007N_001 (to be transferred to MZB) .

Description

Male (Figs 21–22)

MEASUREMENTS. Total length 2.79. Carapace length 1.29; width 0.74. Opisthosoma length 1.50; width 0.67. Diameter of eyes: AME 0.26; ALE 0.10; PLE 0.09. Interdistances between eyes: ALE–ALE 0.50; ALE– PLE 0.33; PLE–PLE 0.53. Leg measurements: leg I 2.95 (0.83, 0.33, 0.96, 0.59, 0.24); leg II 1.32 (0.39, 0.16, 0.33, 0.28, 0.16); leg III 1.24 (0.38, 0.12, 0.28, 0.27, 0.19); leg IV 1.62 (0.50, 0.19, 0.38, 0.33, 0.22).

HABITUS AND COLORATION. Carapace reddish-brown, elongated, flat surface pitted. Chelicerae red; dentition: two promarginal, three retromarginal. Opisthosoma slender oval, light brown; dorsally almost wholly covered in scutum. Leg I much thicker than other legs, especially tibia and tarsus; predominantly reddish-brown; tibia I with three pairs of ventral spines and flat tibial scales; metatarsus I with two pairs of ventral spines; rest of legs pale with dark lateral markings. Spinnerets basally light-brown, distally pale.

PALP (Fig. 22). Tibia length-to-width ratio 0.95. RTA twice as long as tibia, tapering, distally slightly curved ventrally into rounded tip. Cymbium oval. Tegulum swollen, rhombic-shaped, divided by oblique cleft; short, rounded anterior-lateral process present. Embolus coiled approximately two times, coil width approximately two-thirds width of bulb; process of embolic disc membranous with blunt tip. Sperm duct thick, following retrolateral edge of tegulum.

Female (Figs 23–24)

MEASUREMENTS. Total length 2.87. Carapace length 1.27; width 0.69. Opisthosoma length 1.60; width 0.62. Diameter of eyes: AME 0.27; ALE 0.08; PLE 0.09. Interdistances between eyes: ALE–ALE 0.51; ALE–PLE 0.31; PLE–PLE 0.53. Leg measurements: leg I 2.14 (0.60, 0.22, 0.71, 0.41, 0.20); leg II 1.16 (0.31, 0.14, 0.29, 0.26, 0.16); leg III 1.09 (0.27, 0.12, 0.27, 0.24, 0.19); leg IV 1.61 (0.45, 0.15, 0.43, 0.39, 0.19).

HABITUS AND COLORATION. Female habitus as in male, except following: opisthosoma with dorsal scutum covering only anterior third; leg I slightly less robust, especially femur; lateral markings on legs II–IV less distinct.

EPIGYNUM (Fig. 24). Epigynal plate rectangular, much longer than wide. Copulatory opening large, located anteriorly. Copulatory ducts long, initially rather straight before turning into 2 large U-turns, followed by two small coils. Spermatheca large, kidney-shaped. Fertilization ducts broken off during dissection.

Distribution

Sumatra: Jambi Province.

Natural history

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