Psenuc lalawa

Psenuc lalawa Dhiya’ulhaq sp. nov.

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Figs 39–42 View Fig View Fig View Fig View Fig

Diagnosis

Males of Psenuc lalawa Dhiya’ulhaq sp. nov. resemble those of Psenuc manillaensis (Prószyński, 1992) , Psenuc nuclearis (Prószyński, 1992) , and Psenuc vesporum (Prószyński, 1992) in having an RTA with wide, trapezoid base extending into tapering ventral lobe but can be differentiated from those of the latter three species by a sharp dorsal corner of RTA ( Fig. 40E View Fig vs rounded/curved in P. manillaensis [ Prószyński 1992a: fig. 84]; P. nuclearis [ Prószyński 1992a: fig. 86]; and P. vesporum [ Prószyński 1992a: fig. 89]) and position of tegular bump, approximately at mid-length of tegulum (vs anterior third of tegulum in latter three species). Females resemble those of Psenuc solomonensis (Prószyński, 1992) in having large, thumb-shaped spermathecae but can be distinguished by almost vertical final part of copulatory ducts ( Fig. 42B–C View Fig vs almost horizontal in P. solomonensis [ Prószyński 1992a: fig. 102]) and longer accessory glands, three-quarters length of spermathecae (vs half length of spermathecae in P. solomonensis ).

Etymology

The specific epithet is taken from the word ‘ lalawa ’ which is used to refer to spiders in the town of Lubuk Kepayang ( Jambi Province, Sumatra, Indonesia). Noun in apposition.

Material examined

Holotype

INDONESIA – Jambi Province • ♂; Sarolangun, Air Hitam, Lubuk Kepayang ; 2°05′43.0″ S, 102°46′59.7″ E; elev. 73 m; 22 Jun. 2013; J. Drescher leg.; canopy fogging in rubber plantation; GOET 2013 _BR3.1_ AraSalt 045N_001 (to be transferred to MZB). GoogleMaps

Paratypes

INDONESIA – Jambi Province • 1 ♂; same data as for holotype; ZMH ZMH-A0031834 GoogleMaps • 1 ♀; Sarolangun, Air Hitam , Lubuk Kepayang ; 2°04′36.0″ S, 102°46′22.4″ E; elev. 54 m; 27 Jun. 2013; J. Drescher leg.; canopy fogging in rubber plantation; GOET 2013_BR4.1_AraSalt045N_001 (to be transferred to MZB) GoogleMaps • 1 ♀; 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; ZMH ZMH-A0031835 GoogleMaps .

Description

Male ( Figs 39–40 View Fig View Fig )

MEASUREMENTS. Total length 3.23. Carapace length 1.47; width 1.10. Opisthosoma length 1.76; width 1.00. Diameter of eyes: AME 0.29; ALE 0.16; PLE 0.13. Interdistances between eyes: ALE–ALE 0.62; ALE–PLE 0.41; PLE–PLE 0.71. Clypeus height 0.02. Leg measurements: leg I 2.73 (0.82, 0.45, 0.78, 0.42, 0.26); leg II 2.04 (0.68, 0.24, 0.44, 0.41, 0.27); leg III 1.21 (0.61, 0.22, 0.37, 0.36, 0.26); leg IV 2.47 (0.82, 0.32, 0.65, 0.39, 0.29).

HABITUS AND COLORATION. Carapace elongated, dark-brown; frontal and lateral margins covered in thin stripe of white setae; row of stridulatory setae present under posterior eyes. Chelicerae dark-brown; dentition: one promarginal, two retromarginal. Opisthosoma oval; dorsally with a gray cardiac mark and alternating pale and gray curved stripes, as well as a pale, divided, heart-shaped mark in middle; dark-gray ventrally as well as spinnerets. Leg I much stouter than other legs, tibia especially broadened, colored same as carapace; rest of legs light-brown. Spinnerets brown.

PALP ( Fig. 40 View Fig ). Dorsal surface of palp covered in flat, white setae. Tibia length-to-width ratio 0.95, dorsally covered in flat, white scales. RTA with wide, rectangular base; dorsal and anterior ramus straight, joining at almost right angle and creating sharp corner; ventral lobe as long as RTA base, tapering to pointed apex. Tegulum oval, slightly oblique. Tegular lobe rounded, approximately half width of bulb; tegular bump with curved apex and small membranous part beneath apex. Embolus arising at 8:00 position, long and curved, following prolateral margin of cymbium.

Female ( Figs 41–42 View Fig View Fig )

MEASUREMENTS. Total length 3.75. Carapace length 1.53; width 1.01. Opisthosoma length 2.22; width 1.42. Diameter of eyes: AME 0.29; ALE 0.16; PLE 0.12. Interdistances between eyes: ALE–ALE 0.60; ALE–PLE 0.50; PLE–PLE 0.74. Clypeus height 0.02. Leg measurements: leg I 1.80 (0.58, 0.27, 0.48, 0.26, 0.21); leg II 1.55 (0.50, 0.28, 0.34, 0.25, 0.18); leg III 1.49 (0.53, 0.20, 0.38, 0.21, 0.17); leg IV 2.44 (0.79, 0.33, 0.62, 0.47, 0.23).

HABITUS AND COLORATION. Female habitus as in male, except following: white setae of carapace only on lateral margins; leg I only slightly stouter than other legs, colored lighter than carapace.

EPIGYNUM ( Fig. 42 View Fig ). Epigynal plate oval, wider than long. Epigynal pockets thumb-shaped, located at posterior corner of epigynal plate. Copulatory openings narrow, located just anterior to inlet of spermatheca. Copulatory ducts looping twice, followed by very sharp turn, finishing into almost vertical straight tube. Spermathecae large, thumb-shaped. Fertilization ducts arising from anterior region of spermathecae, bent at right angle at basal third.

Distribution

Sumatra: Jambi Province.

Natural history

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