Dactylopisthoides wrangelianus (Marusik & Koponen, 2009) Tanasevitch & Marusik, 2023

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 wrangelianus (Marusik & Koponen, 2009) comb. nov.

Figs 2A-F , 3B , 4

Uusitaloia wrangeliana Marusik & Koponen, 2009: 18, figs 1a, b, 2d, e (♂).

Types.

Holotype ♂ (ZMMU), Russia, Wrangel Isl., the upper reaches of Neizvestnaya River, 71°12.933'N, 179°19.353'W, 128 m, steppe-like mound #2, 06.VII-03.VIII.2006, leg. O.A. Khruleva. Paratypes: 1♂ (ZMMU), same locality, steppe-like, mound #3, 03.VII.-03.VIII.2006, leg. O.A. Khruleva; 2 ♂ (ZMMU, paratypes of D. hyperboreus ) Wrangel Isl., lower reaches of Gusinaya River, gravel hilltop, 2.VII. 1984, leg. O.A. Khruleva; 1♂, 1♀ (ZMMU), middle reaches of Mamontovaya River, 22.VII-5.VIII.2015, leg. O.A. Khruleva.

Note.

Since a single female of this species was used to obtain SEM photographs, its technical description was impossible to produce.

Diagnosis.

Dactylopisthoides wrangelianus is most similar to D. hyperboreus (see above for diagnostic characters). From D. transbaicalicus , it differs in having a wider and shorter dorsal tibial outgrowth (cf. Fig. 2B and figs 40, 41, 43, 44 in Marusik et al. [2001]) and a well-developed radical tooth of the embolic division (cf. Fig. 3B, C ).

Description.

See Marusik and Koponen (2009).

Distribution.

To date, this species is known from Wrangel Island only ( Khruleva et al. 2022). Yet, the records of D. hyperboreus from Chukotka Peninsula ( Marusik 1993) are likely to also refer to D. wrangelianus . There are also unpublished data (YM, personal data) about its occurrence in Chaun Bay in Chukotka. Unfortunately, the sample studied, represented by females, was lost.

Figures

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).