Pseudomicrocentria uncata, Tanasevitch, 2020

Tanasevitch, Andrei V., 2020, Two new linyphiid species from Borneo and Sumatra (Araneae: Linyphiidae), Raffles Bulletin of Zoology 68, pp. 473-478 : 474

Pseudomicrocentria uncata , new species

( Figs. 1 , 7–11 )

Holotype. Male ( MHNG), EAST MALAYSIA, Sabah, Mt Kinabalu N.P. , above Gunting Lagadan, 3,400 m a.s.l., 19 May 1987, coll. A. Smetana.

Paratype. 1 male ( MHNG), Mt Kinabalu N.P. , base of St. John’s Peak, 3,950–4,000 m a.s.l., 20 May 1987, coll. A. Smetana [b62] .

Diagnosis. Pseudomicrocentria uncata , new species, is characterised by a long and narrow radix abruptly bent in the middle. The species is similar to P. simplex , originally described from the border between Singapore and mainland Malaysia, but it can easily be distinguished by the shape of the palpal tibia ( Fig. 10 cf. Fig. 12 ), as well as by the bent radix ( Fig. 8 cf. Fig. 13 ). Both Oriental species, P. simplex and P. uncata , new species, besides having differences in the genitalic structure, differ from their Afrotropical congener, P. minutissima , by the normal, not enlarged eyes.

Etymology. The specific name is a Latin adjective, meaning “bent”, referring to the shape of the radix in the new species.

Description. I describe the paratype here to avoid causing damage to the holotype. Somemeasurements of the holotype are given in brackets. Carapace and abdomen shapes, body and leg colouration of holotype are same as in paratype.

Male paratype. Total length: 1.30 (1.28 in holotype). Carapace unmodified (as in Fig. 1 ), 0.63 long, 0.48 wide (0.63 and 0.46 in holotype, respectively), pale greyish brown. Eyes normal, not enlarged, sulci absent. Chelicerae 0.30 long, mastidion absent. Legs pale brown. Leg I 1.53 long (0.43 + 0.20 + 0.35 + 0.30 + 0.25), IV 1.56 long (0.43 + 0.20 + 0.35 + 0.35 + 0.23). Chaetotaxy: 2.2.2.1. Length of spines 1–1.5 diameters of corresponding leg segment. TmI 0.48 (0.50 in holotype). Metatarsus IV without trichobothrium. Palp ( Figs. 7–11 ): Tibia slightly elongated, with a small rounded process antero-retrolaterally. Paracymbium very small, L-shaped. Tegulum with a sharp outgrowth distally. Distal suprategular apophysis short, more or less transparent, with a small tooth at base. Median membrane reduced. Convector absent. Radix long, narrow, abruptly bent in the middle. Embolus very short, slightly curved. Abdomen ( Fig. 1 ) 0.65 long, 0.45 wide (0.63 and 0.48 in holotype, respectively), dark grey.

Female unknown.

Distribution. So far known only from Sabah, Indonesia.

Figures

Figs. 1–6. Pseudomicrocentria uncata, new species, male paratype (1), Ummeliata jambi, new species, male holotype (2–4) and female paratype (5–6). 1–2, male body, dorsal view; 3–4, male prosoma, lateral and frontal views, respectively; 5, female body, dorsoventral view; 6, female abdomen, ventral view. Scale = 0.5 mm.

Figs. 7–13. Details of male palp structure of Pseudomicrocentria uncata, new species, paratype (7–11), and P. simplex Locket, 1982 (12–13), after Locket (1982). 7, right palp, retrolateral view; 8, 13, right palp, prolateral view; 9, palpal patella, tibia, and paracymbium, prolateral view; 10, 12, palpal tibia, dorsal view; 11, distal part of embolic division. Scale = 0.1 mm. Figs. 11–13, not to scale.