Erigone apophysalis, 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 : 330-331

Erigone apophysalis new species

Figs 14–18

Holotype male ( MHNG), INDONESIA, Sumatra, Jambi Province, Mt Kerinci, footpath to summit, W of Kersik Tua , 2160 m a.s.l., evergreen hill forest, sifting ; 17–18.II.2000; P. Schwendinger leg. [Sum-00/13]. One male paratype (MHNG), collected together with the holotype.

Etymology. The specific name, an adjective, refers to the strongly enlarged posterior radical apophysis of the embolic division.

Diagnosis. The new species is similar to Erigone sumatrana n. sp. (see below), and can be distinguished from the Oriental congeners by the shape of a strongly enlarged posterior radical apophysis (posterior tooth sensu Crosby & Bishop 1928) of the embolic division, as well as by the unmodified palpal tibia, bearing a small clawshaped tooth apically. Erigone apophysalis n. sp. is also diagnosed by a chaetotaxy formula untypical of the genus, 2.2.1.1 versus 2.2.2.1.

Description. Male paratype. Rather small Erigoninae , total length 1.60. Carapace unmodified, 0.85 long, 0.68 wide, reddish-brown, with narrow radial stripes, no teeth at edge of carapace. Chelicerae unmodified, 0.28. long, mastidion very small, no teeth on anterior lateral surface. Legs pale reddish brown. Leg I, 2.19 long (0.55+0.23+0.58+0.50+0.33), IV, 2.32 long (0.63+0.20+0.55+0.50+0.35). Chaetotaxy 2.2.1.1, length of spines 1.5–2 diameters of segment. TmI, 0.51. Metatarsi IV without trichobothrium. Palp ( Figs 14–18 ): Patella without ventro-apical outgrowth. Palpal tibia slightly elongated, with a small hook-like tooth apically. Paracymbium Lshaped, its distal part expanded. Distal suprategular apophysis relatively long and wide. Embolic division with a thick, long, slightly curved posterior radical apophysis, with a small median and a small mesal radical tooth. Embolic membrane (not sensu Hormiga 2000) long and narrow, sabre-shaped. Embolus proper small, directed forward. Abdomen 0.90 long, 0.63 wide, dark grey.

Female. Unknown.

Distribution. Only known from the type locality, a volcano and the highest peak on Sumatra Island.

Figures

FIGURES 14 – 18. Erigone apophysalis n. sp., male holotype from Mt Kerinci. 14, 15, Right palp, retrolateral and prolateral views, respectively. 16, Palpal tibia, dorsal view. 17, Embolic division. 18, Apical part of embolus and embolus proper. Scale bars: 14 – 17, 0.1 mm; 18, 0.05 mm.