Dactylopisthoides hyperboreus Eskov, 1990

Tanasevitch, Andrei & Marusik, Yuri, 2023, On the synonymy of Dactylopisthoides Eskov, 1990 and Uusitaloia Marusik, Koponen & Danilov, 2001 (Araneae, Linyphiidae), ZooKeys 1184, pp. 291-299 : 291

Dactylopisthoides hyperboreus Eskov, 1990

Figs 1A-F , 3A , 4

Dactylopisthoides hyperboreus Eskov, 1990: 4, figs 1-6 (♂♀).

Types.

Holotype ♂ (ZMMU), Russia, Magadan Area, the upper reaches of Kolyma River, Sibit-Tyellakh, Pinus pumila thickets, 14.IX.1985, leg. Y.M. Marusik. Paratypes (all in ZMMU): 2 ♀♀, collected together with the holotype; 4 ♂♂, 8 ♀♀, same habitat, 12.VII. 1985, leg. Y.M. Marusik; 1 ♂, upper reaches of Kolyma River, c. 10 km upstream of Vetrenny Vil., Salix thicket on Carex swamp, 5.VIII.1984, leg. K.Y. Eskov; 1 ♂, headwater of Kolyma River, Kulu River, mouth of Stokovy Creek, Pinus pumila thicket on scree, 11.VIII.1986, leg. Y.M. Marusik; 1 ♂, Detrin River (the right tributary of Kolyma River), c. 56 km upstream of the mouth, 30.VIII.1986, leg. Y.M. Marusik.

Comments.

This species has been known from a single taxonomic entry.

Diagnosis.

Dactylopisthoides hyperboreus seems particularly similar to D. wrangelianus . The male differs in the shorter dorsal tibial outgrowth (cf. Figs 1C and 2B ) and a triangular radical tooth, vs stylet-shaped (cf. Figs 1E , 2E and Fig. 2A, B ); the female differs in the wider fovea of the epigyne (cf. Fig. 1F and Fig. 2F ). From D. transbaicalicus , it can be easily distinguished by the wider and shorter dorsal tibial outgrowth (cf. Fig. 1C and figs 40, 41, 43, 44 in Marusik et al. [2001]), as well as by the well-developed radical tooth of the embolic division (cf. Fig. 1E and Fig. 3C ).

Description.

See Eskov (1990).

Distribution.

This species was described from several localities in the upper reaches of Kolyma River and Wrangel Island ( Eskov 1990). Later, it was reported from Chukotka Peninsula ( Marusik 1993), Ola Plateau in the south part of Magadan Area ( Marusik 2005). The records of D. hyperboreus from Chukotka Peninsula ( Marusik 1993) are likely to be erroneous and may refer to D. wrangelianus .

Figures

Figure 1. Details of the male palp (A-E) and epigyne (F) of Dactylopisthoides hyperboreus Eskov, 1990, specimens from the type locality A-C right palp, retrolateral (A, B) and dorsal view (C), respectively D, E bulb, lateral view, different aspects F epigyne, ventral view. Abbreviations: dsa - distal suprategular apophysis, ep - embolus proper, mm - median membrane, mt - median tooth, pp - posterior projections of lateral walls, r - radix, rt - radical tooth.

Figure 2. Details of the male palp (A-E) and female epigyne (F) of Dactylopisthoides wrangelianus (Marusik & Koponen, 2009), specimens from Mamontovaya River, Wrangel Isl A-D right palp, retrolateral, dorsal, ventral and frontal view, respectively E embolic division, frontal view F epigyne, ventral view. Abbreviations: dsa - distal suprategular apophysis, ep - embolus proper, mm - median membrane, mt - median tooth, pp - posterior projections of lateral walls, r - radix, rt - radical tooth.

Figure 3. Frontal view of the embolic divisions of Dactylopisthoides hyperboreus Eskov, 1990 (A), D. wrangelianus (Marusik & Koponen, 2009) (B) and D. transbaicalicus (Marusik, Koponen & Danilov, 2001) [reproduced from Marusik and Koponen (2009)] (C). Abbreviations: dsa - distal suprategular apophysis, mm - median membrane, mt - median tooth, rt - radical tooth. Black, thick arrows show additional differences between species. Scale bar: 0.1 mm (S).

Figure 4. Collecting localities of Dactylopisthoides species: D. hyperboreus (dot), D. transbaicalicus (diamond), D. wrangelianus (square), records of D. hyperboreus that could also refer to D. wrangelianus (triangle).