Open Access
Translator Disclaimer
21 April 2022 A new species of Anguliphantes Saaristo & Tanasevitch, 1996 from southern Tadjikistan, Central Asia (Araneae: Linyphiidae)
Andrei V. Tanasevitch
Author Affiliations +
Abstract

Anewspecies, Anguliphantestadjik sp. nov., is described from medium altitudes in the mountains of the Republic of Tadjikistan. The species is very similar to the Himalayan A. nepalensis (Tanasevitch, 1987) and A. nepalensoides Tanasevitch, 2011, but clearly differs by certain structural details of the palp in the male and by the shape of the scapus in the female.

INTRODUCTION

Anguliphantes Saaristo & Tanasevitch, 1996 is a small Eurasian micronetine genus currently containing 16 species (World Spider Catalog, 2021). At present only two species of this genus are known from the mountains of Central Asia: A. nepalensis (Tanasevitch, 1987) and A. nepalensoides Tanasevitch, 2011. Anguliphantes nepalensis was described from both sexes from the Himalayas of Pakistan, Nepal and India (Tanasevitch, 1987, 2011; Tanasevitch & Saaristo, 2006), while A. nepalensoides is only known from a single male from the Himalayan part of West Bengal, India (Tanasevitch, 2011).

Below I report on a third, new species of Anguliphantes with very close ties to both Himalayan congeners.

MATERIAL AND METHODS

This paper is based on specimens (belonging to a new species) from the author's personal collection which will be deposited in the Muséum d'histoire naturelle, Geneva, Switzerland (MHNG) and on comparative specimens in the Zoological Museum of Moscow University (ZMMU). Sample numbers are given in square brackets. Specimens preserved in 70% ethanol were studied using an MBS-9 stereomicroscope. Drawings were done with the help of a drawing tube; a Levenhuk C-800 digital camera was used for taking photographs. Leg chaetotaxy is presented in a formula, e.g., TiI: 2-1(2)-1-0, which means that tibia I has two dorsal spines, one or two prolateral, one retrolateral and no ventral spines, the apical spines are disregarded. The sequence of leg segment measurements is as follows: femur + patella + tibia + metatarsus + tarsus. All measurements are given in mm. Scale lines in the figures correspond to 0.1 mm unless indicated otherwise. Figure numbers are given above the corresponding scale lines, the length they represent is given below them. The terminology of copulatory organs mainly follows that of Saaristo & Tanasevitch (1996).

Abbreviations

a.s.l.

above sea level

DS

distal part of scapus

EP

embolus proper

Fe

femur

FG

Fickert's gland

LC

lamella characteristica

LE

lateral extention of embolus

LL

lateral lobe of distal part of scapus

LO

lateral outgrowth of scapus

MA

membranous area of radix

MM

median membrane

Mt

metatarsus

P

paracymbium

PMP

posterior median plate

Ps

proscapus (= proximal part of scapus)

R

radix

SE

swollen extention of paracymbium

SS

serrate surface of embolus

St

stretcher

TA

terminal apophysis

Ti

tibia

TmI

relative position of trichobothrium on the metatarsus of leg I

TAXONOMY

Anguliphantes Saaristo & Tanasevitch, 1996
Anguliphantes tadjik sp. nov.
Figs 1-9, 14-16

  • Holotype: MHNG; male; TADJIKISTAN, Sanglak Mts, Khatlon Region, Danghara District, environs of Sebiston, ca 38.248°N, 69.245°E, 1200-1500 m a.s.l.; 6.V.1991; leg. S. Ovtchinnikov.

  • Paratype: MHNG; 1 female; collected together with the holotype.

  • Comparative material: Anguliphantes nepalensis (Tanasevitch, 1987): ZMMU (# Ta-8182); 1 male; NEPAL, Mustang District, Thakkhola, Chadziou-Khola, 2700-2900 m a.s.l., monsoon-influenced, dense, primary broadleaved forest in canyon, with bamboo growth; X.1969; leg. J. Martens. – ZMMU (# Ta-8183); 2 males, 3 females [sample #108]; Solukhumbu District, Khumbu, Mt. Everest region, 3250-3300 m a.s.l., confluence of Imja and Phunki-Drangka, Betula forest; 30.IX.-2.X.1970; leg. J. Martens.

  • Etymology: The species name is a noun in apposition, meaning a native of Tadjikistan.

  • Diagnosis: The new species is distinguished from all known congeners by its relatively long legs. The male is also characterized by a modified palpal tibia, as well as by the shape of its lamella characteristica and of its embolus. The female differs by the shape of the proscapus base.

  • Description: Male holotype. Habitus as in Fig. 1. Total length 2.13. Carapace unmodified, 0.98 long, 0.85 wide; pale brown, with an indistinct grey, median spot and a greyish margin. Eyes relatively small, each with a black fringe. Chelicerae unmodified, 0.43 long, of same colour as carapace. Legs yellow to pale yellow. Leg I 7.42 long (1.75 + 0.30 + 2.00 + 1.98 + 1.39), leg IV 6.09 long (1.63 + 0.28 + 1.65 + 1.75 + 0.78). Chaetotaxy: FeI: 0-2-0-0, FeII-IV: 0-0-0-0; TiI: 2-1-1-0, TiII: 2-0-1-0; TiIII-IV: 2-0-0-0; MtI-III: 1-0-0-0, MtIV: 0-0-0-0. Metatarsi I-III each with a trichobothrium. TmI 0.08. Palp (Figs 3-9): Patella with a special spine (see Saaristo & Tanasevitch, 1996). Cymbium with neither posterodorsal outgrowth nor process. Tibia with a small, conical dorsal tubercle carrying a weak spine, and with a small arcuate projection retrolaterally. Paracymbium relatively large, toothless, its posterior and anterior pockets merged into a single large pocket. Terminal apophysis relatively small, complex in shape. Lamella characteristica widened near middle, narrowing distally, bifid apically. Embolus large and wide, its serrate surface (see Saaristo & Tanasevitch, 1996) well-developed. Five small, slender, blunt teeth at base of embolus. Embolus proper short, bifid. Abdomen (Fig. 1) 1.10 long, 0.65 wide, dark grey, dorsal pattern absent. Female paratype. Habitus as in Fig. 2. Total length 2.35. Carapace unmodified, 1.05 long, 0.75 wide; yellow, with a grey median spot and a greyish margin. Eye sizes as in male. Chelicerae 0.45 long. Legs yellow. Femur and patella I 1.75 and 0.30 long, respectively, other segments of leg I missing. Leg IV 6.01 long (1.70 + 0.28 + 1.63 + 1.60 + 0.80). Chaetotaxy: FeI: 0-2(3)-0-0, FeII-IV: 0-0-0-0; TiII: 2-0-1-0; TiIII-IV: 2-0-0-0; MtII: 1(2)-0-0-0, MtIII: 1-0-0-0, MtIV: 0-0-0-0. TmI unknown, metatarsi I missing. Abdomen (Fig. 2) 1.50 long, 1.00 wide, grey. Epigyne (Figs 14-16): Proscapus long and slender, gradually curving, with a small outgrowth at its base on both sides. Distal part of scapus widening. Lateral lobes long, extending far out from both sides of proscapus. Stretcher long and slender, pit distinct. Posterior median plate small, longer than wide.

  • Taxonomic remarks: Judging from the modified palpal tibia, the structure of the embolic division in the male and the shape of the scapus in the female, the new species seems to be most closely related to the Himalayan A. nepalensis (see Introduction). Anguliphantes tadjik sp. nov. differs by the shape of the retrolateral projection of its palpal tibia (Figs 4-5 cf. Fig. 10), by the the absence of a swollen extension on its paracymbium (Fig. 6 cf. Fig. 10), by the shape of its embolus (Fig. 8 cf. Fig. 12), as well as by the shape of its lamella characteristica (Fig. 9 cf. Fig. 13). The female differs from that of A. nepalensis by the longer proscapus and the presence of lateral extensions on both sides of the proscapus (Fig. 14 cf. Fig. 17).

  • Breitling (2019, 2021) suggested that Anguliphantes is a junior synonym of Oryphantes Hull, 1932 on the basis of DNA barcoding data using a fragment of the MT-CO1 (cytochrome c oxidase subunit I) gene. However, it is well known that CO1 barcoding alone is quite unreliable at the generic level (for details see paragraph 7 at  https://wsc.nmbe.ch/faq). The separation of the genera Anguliphantes and Oryphantes was confirmed by clear-cut differences in the genital structures of both sexes, in particular the embolus division of the male palp and the lateral walls of the female epigyne (for details see Saaristo & Tanasevitch, 1996).

  • Figs 1-2.

    Photographs of the male holotype (1) and of the female paratype (2) of Anguliphantes tadjik sp. nov. (1) Habitus, lateral view. (2) Habitus, anterolateral view.

    img-z2-17_123.jpg

    Figs 3-13.

    Details of the right palp of the male holotype of Anguliphantes tadjik sp. nov. (3-9) and of the male paratype (SMF # 34738) of A. nepalensis (Tanasevitch, 1987) from Pare, Nepal (10-13; reproduced from Tanasevitch & Saaristo, 2006). (3) Distal part of palp, retrolateral view. (4-5) Palpal tibia, lateral and dorsal views, respectively. (6, 10) Palpal tibia and paracymbium, retrolateral and dorsal views, respectively. (7, 11) Embolic division, lateral view. (8, 12) Embolus, lateral view. (9, 13) Lamella characteristica, lateral view.

    img-z3-3_123.jpg

    Figs 14-17.

    Epigyne of female paratype of Anguliphantes tadjik sp. nov. (14-16) and of female paratype (SMF # 34738) of A. nepalensis (Tanasevitch, 1987) from Pare, Nepal (17; reproduced from Tanasevitch & Saaristo, 2006). (14, 17) Ventral view. (15) Lateral view. (16) Dorsal view.

    img-z4-3_123.jpg

    ACKNOWLEDGEMENTS

    I am deeply grateful to Alexander Gromov (Bingen am Rhein, Germany) for having traced the modern names of the type locality, to Sergei Golovatch (Moscow, Russia) for kindly checking the English of an advanced draft of the manuscript, to Theo Blick (Hummeltal, Germany) for reviewing the manuscript, as well as to Peter Schwendinger (MHNG) for editing it.

    REFERENCES

    1.

    Breitling R. 2019. Barcode taxonomy at the genus level. Ecologica Montenegrina 21: 17–37. Google Scholar

    2.

    Breitling R. 2021. A completely resolved phylogenetic tree of British spiders (Arachnida: Araneae). Ecologica Montenegrina 46: 1–51. Google Scholar

    3.

    Hull J.E. 1932. Nomenclature of British linyphiid spiders: A brief examination of Simon's French catalogue. Transactions of the Northern Naturalists' Union 1: 104–110. Google Scholar

    4.

    Saaristo M.I., Tanasevitch A.V. 1996. Redelimitation of the subfamily Micronetinae Hull, 1920 and the genus Lepthyphantes Menge, 1866 with descriptions of some new genera (Aranei, Linyphiidae). Berichte des naturwissenschaftlich-medizinischen Vereins in Innsbruck 83: 163–186. Google Scholar

    5.

    Tanasevitch A.V. 1987. The spider genus Lepthyphantes Menge 1866 in Nepal (Arachnida: Araneae: Linyphiidae). Courier Forschungsinstitut Senckenberg 93: 43–64. Google Scholar

    6.

    Tanasevitch A.V. 2011. Linyphiid spiders (Araneae, Linyphiidae) from Pakistan and India. Revue suisse de Zoologie 118: 561–598. Google Scholar

    7.

    Tanasevitch A.V., Saaristo M.I. 2006. Reassessment of the Nepalese species of the genus Lepthyphantes Menge s. l. with descriptions of new Micronetinae genera and species (Araneae, Linyphiidae, Micronetinae). Senckenbergiana biologica 86: 11–38. Google Scholar

    8.

    World Spider Catalog 2021. World Spider Catalog, version 22.5. Natural History Museum Bern. Available at http://wsc.nmbe.ch(accessed in September 2021). Google Scholar
    Andrei V. Tanasevitch "A new species of Anguliphantes Saaristo & Tanasevitch, 1996 from southern Tadjikistan, Central Asia (Araneae: Linyphiidae)," Revue suisse de Zoologie 129(1), 123-127, (21 April 2022). https://doi.org/10.35929/RSZ.0066
    Accepted: 2 February 2021; Published: 21 April 2022
    JOURNAL ARTICLE
    5 PAGES


    Share
    SHARE
    KEYWORDS
    Micronetinae
    montane fauna
    spiders
    taxonomy
    RIGHTS & PERMISSIONS
    Get copyright permission
    Back to Top