Siamspinops garoensis Kadam, Tripathi & Sankaran, 2022

Sankaran, Pradeep M., Kadam, Gautam, Sudhikumar, Ambalaparambil Vasu & Tripathi, Rishikesh, 2022, First record of Siamspinops Dankittipakul & Corronca, 2009 from India, first description of the female of Makdiops shevaroyensis (Gravely, 1931), and a catalogue of Indian selenopid fauna (Araneae, Selenopidae), Zootaxa 5194 (1), pp. 109-121 : 110-113

publication ID	https://doi.org/ 10.11646/zootaxa.5194.1.6
publication LSID	lsid:zoobank.org:pub:345FE712-0A1F-4EC8-B5EF-AC13FCF539E8
DOI	https://doi.org/10.5281/zenodo.7141995
persistent identifier	https://treatment.plazi.org/id/C56D8781-9828-A518-FF02-FBD596F4FEB1
treatment provided by	Plazi
scientific name	Siamspinops garoensis Kadam, Tripathi & Sankaran, 2022
status	sp. nov.

Treatment

Siamspinops garoensis Kadam, Tripathi & Sankaran, 2022 sp. nov.

Figs 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 , 8 View FIGURE 8

Etymology. The specific epithet is an adjective and refers to the type locality of the new species.

Type material. Holotype: ♂ from INDIA: Meghalaya: North Garo Hills: Resu Haluapara (25°55.42′N, 90°35.97′E; 197 m a.s.l.), 05 April 2022, from tree trunk, by hand, G. Kadam (ZSI/ WGRC /I. R.-INV.20973) GoogleMaps . Paratypes: 1 ♀, same data as for the holotype GoogleMaps ; 1 ♀, same data as for the holotype GoogleMaps except West Jaintia Hills: Raliang (25°30.41′N, 92°28.32′E; 1089 m a.s.l.), 08 April 2022 (ZSI/ WGRC /I. R.-INV.20974 & 20975) GoogleMaps .

Diagnosis. Siamspinops garoensis sp. nov. is most similar to Siamspinops formosensis (Kayashima, 1934) as both share a short, hook-shaped median apophysis, semi-circular posterior epigynal pockets, and M-shaped uterus externus, but can be distinguished by the following combination of characters: males by distally rounded ventral branch of retrolateral tibial apophysis (vs. distally narrow in S. formosensis ), dorsal branch of retrolateral tibial apophysis broad along its entire length in ventral view (vs. distally narrow in S. formosensis ) and conductor with sclerotised retrolateral apex ending at 3-o’ clock ventrally (vs. 4-o’ clock in S. formosensis ) (compare Figs 2H View FIGURE 2 , 4A View FIGURE 4 with Yu et al. 2019: figs 9, 15); females by deep posteromedian excavation of epigyne (vs. less deep in S. formosensis ) and copulatory ducts with 14 turns (vs. 9 turns in S. formosensis ) (compare Figs 3H–I View FIGURE 3 , 4C–E View FIGURE 4 with Yu et al. 2019: figs 4–5, 12–13).

Description. Male (holotype, Figs 2A–F View FIGURE 2 , colouration in alcohol): Carapace, eye region, clypeus, chelicerae, endites, labium yellowish brown; sternum, leg and palp segments, opisthosoma, spinnerets creamy-white; carapace, dorsal chelicerae, dorsal and lateral opisthosoma, leg and palp segments with olive green blotches and streaks. Carapace covered with scattered fine white hairs, with brownish streaks; thoracic margin with curved setae ( Fig. 2B View FIGURE 2 ). Eyes on low tubercles, encircled with black pigment ( Fig. 2C View FIGURE 2 ). Chelicerae significantly longer than those of female; promargin with four and retromargin with two teeth ( Figs 2E–F View FIGURE 2 ). Sternum round, hirsute ( Fig. 2D View FIGURE 2 ). Opisthosoma sub-oval, hirsute ( Fig. 2A View FIGURE 2 ). All tarsi with well-developed claw tufts. Body length 8.64. Carapace 4.07 long, 4.70 wide. Opisthosoma 4.58 long, 3.94 wide. Eye sizes and interdistances: ALE 0.11, AME 0.21, PLE 0.23, PME 0.21; ALE–ALE 1.71, AME–ALE 0.49, AME–AME 0.17, PLE–PLE 2.09, PME–PLE 0.41, PME–PME 0.84. Clypeus height at AMEs 0.12, at ALEs 0.26. Length of chelicerae 1.82. Length of palp and legs: palp 4.71 [1.62, 0.66, 0.82, 1.61], I 17.01 [5.11, 1.91, 4.55, 3.88, 1.56], II 21.96 [7.02, 2.11, 6.05, 5.12, 1.66], III 20.19 [6.98, 1.79, 5.42, 4.53, 1.47], IV 16.87 [5.81, 1.64, 4.36, 3.77, 1.29]. Leg formula: 2341. Spination of palp: femur pld 1 plv 3 do 3 rlv 5, patella pl 1 pld 2 do 2, tibia pl 2 pld 3 do 2 rl 1 rld 2, tarsus/cymbium pl 2 do 2 rld 1; legs: femur I pl 2 do 3, II–IV do 3; patellae I–IV 0; tibia I plv 7 rlv 8, II plv 7 rlv 7, III–IV 0; metatarsus I plv 6 rlv 6, II plv 6 rlv 5, III rlv 2, IV 0; tarsi I–IV 0.

Palp ( Figs 2G–J View FIGURE 2 , 4A–B View FIGURE 4 ): ventral branch of retrolateral tibial apophysis small, distally rounded and spoonshaped ( Figs 2H–I View FIGURE 2 , 4A–B View FIGURE 4 ; vRTA); dorsal branch of retrolateral tibial apophysis large, laminate, 2x wider than ventral branch of retrolateral tibial apophysis ( Figs 2H–J View FIGURE 2 , 4A–B View FIGURE 4 ; dRTA). Cymbium rounded, with long marginal setae ( Figs 2G, I–J View FIGURE 2 ). Tegulum nearly flat, rounded ( Figs 2H View FIGURE 2 , 4A–B; T View FIGURE 4 ). Median apophysis small, unbranched, hookshaped ( Figs 2H–I View FIGURE 2 , 4A–B View FIGURE 4 ; MA). Conductor T-shaped, with long, folded, sclerotised and pointed retrolateral apex ( Figs 2H–I View FIGURE 2 , 4A–B; C View FIGURE 4 , arrow 1). Embolus filiform, originating retrolaterally at 3-o’ clock position (left palp in ventral view), encircling tegulum, with short and sclerotised embolic base, with chisel-shaped tip, with a slight constriction near the tip ( Figs 2G–I View FIGURE 2 , 4A–B; E View FIGURE 4 , EB, arrow 2).

Female (paratype, Figs 1A View FIGURE 1 , 3A–F View FIGURE 3 , colouration in alcohol): General aspects essentially as in male except the following: habitus dull pinkish creamy-white with pale dark blotches and streaks; opisthosoma posteriorly with indistinct chevron pattern ( Fig. 3A View FIGURE 3 ). Chelicerae comparatively short; promargin with three teeth, retromargin with two ( Figs 3E–F View FIGURE 3 ). Body length 10.36. Carapace 3.84 long, 4.56 wide. Opisthosoma 6.52 long, 4.95 wide. Eye sizes and interdistances: ALE 0.10, AME 0.19, PLE 0.21, PME 0.19; ALE–ALE 1.72, AME–ALE 0.50, AME–AME 0.14, PLE–PLE 1.91, PME–PLE 0.26, PME–PME 0.82. Clypeus height at AMEs 0.12, at ALEs 0.21. Length of chelicerae 1.47. Length of palp and legs: palp 3.61 [1.09, 0.60, 0.70, 1.22], I 13.80 [4.18, 1.63, 3.74, 3.02, 1.23], II 12.76 [4.19, 1.29, 3.38, 2.73, 1.17], III 16.12 [5.74, 1.55, 4.35, 3.33, 1.15], IV 14.14 [5.05, 1.37, 3.59, 3.01, 1.12]. Leg formula: 3412. Spination of palp: femur pld 1 plv 3 do 3 rld 1, tarsus pl 2 pld 2 do 2 rl 2 rld 1; legs: tibia I plv 8 rlv 8, II plv 7 rlv 7, III–IV pld 1; metatarsus II plv 6 rlv 5, III–IV 0. Genitalia ( Figs 3G–I View FIGURE 3 , 4C–E View FIGURE 4 ): epigyne with posteromedian excavation ( Figs 3G–I View FIGURE 3 , 4C–E View FIGURE 4 ; arrow 3), with semi-circular posterior epigynal pockets having sclerotised triangular prolateral rims, retrolateral rims indistinct ( Figs 3G–H View FIGURE 3 , 4C View FIGURE 4 ; EP). Copulatory openings small, semi-circular, obliquely oriented, with sclerotised prolateral rims ( Figs 3G–H View FIGURE 3 , 4C View FIGURE 4 ; CO), enclosing a broad epigynal median field having wavy lateral margins ( Figs 3G–H View FIGURE 3 , 4C View FIGURE 4 ; MF). Copulatory ducts long, compact, convoluted with 14 turns ( Figs 3I View FIGURE 3 , 4D–E View FIGURE 4 ; CD). Spermathecae short, lying posteromedially ( Fig. 4E; S View FIGURE 4 ). Proximal part of copulatory ducts, spermathecae and fertilization ducts covered by M-shaped, hyaline uterus externus ( Figs 3I View FIGURE 3 , 4D View FIGURE 4 ; UE). Accessory bulbs of spermathecae thick, anteriorly oriented ( Figs 3I View FIGURE 3 , 4D–E View FIGURE 4 ; AB). Fertilization ducts leaf-like, diverging ( Fig. 4E View FIGURE 4 ; FD).

Variation. Female (n=2): body length 9.43–10.36. Second female specimen ( Fig. 1B View FIGURE 1 ) shows variation in leg spination as follows: tibia I plv 7 rlv 8, II plv 7 rlv 8, metatarsus II plv 5 rlv 5.

Distribution. Known only from Meghalaya, India ( Figs 1C–D View FIGURE 1 , 8 View FIGURE 8 ).

Remarks. First record of the genus from India.