Proislandiana pallida ( Kulczyński, 1908 )

Dimitrov, Dragomir, 2020, A review of the linyphiid spider genus Proislandiana Tanasevitch, 1985 with description of a new high mountainous species from Turkey and Armenia (Araneae: Linyphiidae), Zootaxa 4743 (2), pp. 247-256 : 252-255

Proislandiana pallida ( Kulczyński, 1908)

Figs 17–24

Microneta (?) pallida Kulczyński, 1908: 36 , pl. 1, Figs 34–35

Proislandiana pallida: Tanasevitch, 1985: 56 , Figs 10–12

Proislandiana pallida: Tanasevitch & Khruleva, 2017: 355

Material examined. 2♂, 2♀. Russia, Arkhangelsk area, Nenets AO, env. of Amderma , 69.760° N, 61.659 ° E, 23.07.– 06.08.2016, leg. A. Tanasevitch, O. Khruleva ( MHNG) .

Diagnosis. The species is close to P. beroni n. sp. Males can be distinguished by the bulged paracymbium ( Fig 17 ), as well as by the shape of the embolic membrane ( Fig 17–19 ) and the shape of the prolateral tibial apophyse. In P. pallida the prolateral tibial apophyse is bent in the middle, the distal part is strait, situated perpendicularly to the cymbium ( Fig 20 ), while in P. beroni n. sp. it is arc-shaped ( Figs 4 , 8 ). The females differ from those of P. beroni n. sp. by the longer and narrower epigynal scape ( Figs 21, 23 ). Seen from lateral view, the scape of P. pallida is ringshaped ( Fig 22 ), while in P. beroni n. sp. it looks like semi-ring ( Figs 10 , 14 ).

Redescription. Male. Measurements. Total length 1.66; carapace length 0.76, width 0.55; sternum length 0.45, width 0.40; abdomen length 0.90, width 0.72; clypeus length 0.11; chelicerae length 0.35; eye diameters AME 0.035, ALE 0.050, PME 0.050, PLE 0.050; leg measurements I—2.57 (0.30, 0.65, 0.20, 0.54, 0.45, 0.43), II—2.28 (0.32, 0.45, 0.18, 0.50, 0.43, 40), III—2.02 (0.29, 0.54, 0.15, 0.36, 0.36, 0.32), IV—2.56 (0.29, 0.66, 0.18, 0.60, 0.54, 0.40); palpal cymbium length 0.26.

Carapace unmodified. Chelicerae with four large, sharp promarginal and four small retromarginal teeth. The retromarginal teeth located in the distal part of the chelicerae, near the cheliceral fang.

Coloration. Carapace, chelicerae and legs light yellow. Sternum a little darker than the carapace.Abdomen gray, without pattern, covered with small dark hairs.

Dorsal tibial spination 2, 2, 2, 1. The position of TmI—0.45.

Palp ( Figs 17–20 ). Tibia with one prolateral and one retrolateral apophyses ( Fig 20 ). The retrolateral one small, curved, narrowing apically. The prolateral one long, curved at the middle. Its apical part straight, positioned perpendicularly to the cymbium ( Fig 20 ). Cymbium simple, covered with thin black hairs. Paracymbium bulged. Its distal part notched on the inner side. The base of paracymbium bears 3 stout spines near the tip ( Fig 17 ). Embolus long, thin, curved out apically ( Figs 18–19 ). Ventral part of the embolic division thin, thorn-shaped, well chitinized ( Fig 18 ). Embolic membrane large and complex ( Fig 19 ).

Female. Measurements. Total length 2.35; carapace length 0.85, width 0.60; sternum length 0.54, width 0.40; abdomen length 1.50, width 0.94; clypaeus length 0.11; chelicerae length 0.35; eye diameters AME 0.036, ALE 0.055, PME 0.55, PLE 0.055; leg measurements I—2.78 (0.32, 0.70, 0.22, 0.58, 0.54, 0.42), II—2.66 (0.30, 0.68, 0.22, 0.58, 0.48, 0.40), III—2.31 (0.25, 0.58, 0.20, 0.45, 0.47, 36), IV—2.87 (0.30, 0.75, 0.22, 0.76, 0.44, 0.40).

Chelicerae with four large teeth on promargin and four small ones on retromargin. The promarginal teeth bigger than in male.

Epigynum ( Figs 21–24 ). Scape short and relatively narrow, with an upturned distal part, making a full ring, clearly seen from lateral view ( Figs 21–23 ). The dorsal median plate rounded at the end ( Fig 24 ). Receptacles oval, ducts simple and strait. The genital openings are on the dorsal side, near the tip.

Coloration as in male. Dorsal tibial spination 2, 2, 2, 1. The position of TmI—0.43.

Distribution. Arctic region of Russia, from the polar Ural Mts. to the Far East.

Figures

FIGURES 17–20. Proislandiana pallida, male from Russia, left palp. 17, Retrolateral. 18, Prolateral. 19, Ventral. 20, dorsal.

FIGURES 21–24. Proislandiana pallida, female from Russia. 21, Epigynum, ventral. 22, Epigynum lateral. 23, Vulva, ventral. 24, Vulva, dorsal.

FIGURES 9–12. Proislandiana beroni n. sp., paratype female from Turkey. 9, Epigynum ventral. 10, Epigynum, lateral. 11, Vulva, ventral. 12, Vulva, dorsal.

FIGURES 1–4. Proislandiana beroni n. sp., holotype male, left palp. 1, Retrolateral. 2, Ventral. 3, Prolateral. 4, Dorsal. Scale bar, 0.1 mm.

FIGURES 5–8. Proislandiana beroni n. sp., holotype male, left palp. 5, Retrolateral. 6, Ventral. 7, Prolateral. 8, Dorsal.

FIGURES 13–16. Proislandiana beroni n. sp., paratype female from Turkey. 13, Epigynum ventral. 14, Epigynum, lateral. 15, Vulva, ventral. 16, Vulva, dorsal. Scale bar, 0.1 mm.