Gnathonarium luzon, Tanasevitch, Andrei V., 2017

Tanasevitch, Andrei V., 2017, New species and new records of linyphiid spiders from the Indo-Malayan Region (Araneae, Linyphiidae), Zootaxa 4227 (3), pp. 325-346 : 333-334

Gnathonarium luzon new species

Figs 4, 5 , 26–29

Holotype male ( SMF, ex Roewer Coll. M 907), PHILIPPINES, Luzon Island , Mt Makiling; no date, Bakes leg. Paratypes . 1 Male (without palps and legs), 1 male prosoma with left palp, 1 female (SMF), collected together with the holotype.

Etymology. The specific name is a noun in apposition referring to the island where the types were collected.

Diagnosis. The species seems to be most similar to Gnathonarium dentatum ( Wider, 1834) , differing by the narrower male palpal tibia, as well as by the narrower posterior part of the epigynum. Gnathonarium luzon n. sp. can be distinguished from all congeners by the longest tooth on the male palpal tibia, as well as by the relatively narrow and long seminal ducts of the epigynum.

Description. Male holotype. Large Erigoninae , total length 2.80. Carapace slightly modified, as in Fig. 4 , 1.30 long, 1.00 wide, pale reddish brown. Chelicerae massive, 0.53 long, frontal surface beset with small denticles, mastidion present. Legs yellow. Leg I, 5.25 long (1.50+0.35+1.50+1.10++0.80), IV –? Chaetotaxy unknown, spines mostly lost, but seem to have been 2.2.1.1. TmI unknown: trichobothrium not found. Palp ( Figs 24–28 ): Patella with a ventro-apical conical outgrowth. Tibia with a long crescent-shaped process and a large, narrow, pointed tooth at its base. Tegulum elongated, slightly curved, pale, almost transparent. Distal suprategular apophysis flat, long, pointed apically. Radix small, embolus thin, long, making a loop. Abdomen 1.53 long, 0.88 wide, grey dorsally, with a median white stripe.

Female. Total length 2.88. Carapace unmodified, 1.25 long, 0.95 wide, pale brown. Chelicerae 0.58 long, mastidion absent. Legs yellow. Leg I, 5.67 long (1.53+0.38+1.48+1.50+0.78), IV, 5.33 (1.48+0.35+1.40+1.40+0.70). Chaetotaxy unknown, spines mostly lost, but seem to have been 2.2.1.1. TmI unknown: trichobothrium not found. Abdomen 1.78 long, 1.15 wide, grey dorsally, with a white longitudinal stripe narrowing backwards and with two white transverse stripes, the latter sometimes merging. Epigynum as in Figs 5 , 29 . Seminal ducts relatively long and narrow.

Distribution. Only known from the type locality in the Philippines.

Figures

FIGURES 1 – 7. Asiagone komannai n. sp., male holotype from Ko Man Nai (1, 2). 1, Habitus. 2, Carapace, frontolateral view. Erigone sumatrana n. sp., male paratype from Kersik Tua (3). 3, Carapace, lateral view. Gnathonarium luzon n. sp., male holotype (4) and female paratype (5) from Mt Makiling. 4, Carapace, lateral view. 5, Epigynum, ventral view. Oedothorax myanmar n. sp., male holotype from Kampetlet (6, 7). 6, Carapace, lateral view. 7, Habitus. Scale bars: 1, 2, 4, 6, 7; 3, 0.5 mm; 5, 0.1 mm.

FIGURES 26 – 29. Gnathonarium luzon n. sp., male holotype (26 – 28) and female paratype from Mt Makiling (29). 26, 27, Right palp, retrolateral and prolateral views, respectively. 28, Palpal tibia, dorsal view. 29, Epigynum, ventral view. Scale bars: 0.1 mm.

FIGURES 19 – 25. Erigone sumatrana n. sp., male paratype from Mt Kerinci. 19, 20, Right palp, retrolateral and prolateral views, respectively. 21, 22, Palpal tibia, posterolateral and dorsal views, respectively. 23, Embolic division. 24, 25, Apical part of embolus and embolus proper, different aspects. Scale bars: 19 - 22; 23, 0.1 mm; 24, 25, 0.05 mm.