Indosegeschilika, Choudhury & Siliwal & Das & Giroti, 2021

Choudhury, Sudhir Ranjan, Siliwal, Manju, Das, Sanjay Keshari & Giroti, André Marsola, 2021, Description of a new genus and five new species of tube-dwelling spider family Segestriidae (Araneae: Synspermiata) from Odisha, India, Zootaxa 4963 (1), pp. 91-114 : 104-106

Indosegeschilika sp. nov. Siliwal, Das, Choudhury & Giroti

urn:lsid:zoobank.org:act:444BC9A6-7775-4023-8F8D-76B106163CEF

( Fig. 11 , 12 )

Type specimens: INDIA. holotype ♀, 14.x.2017, Barkud Island, Chilika lake, Ganjam district , Odisha (19° 33’ 22.6”N, 85° 08’ 47.8”E, elev. 05m), coll. S. R. Choudhury and N. Panda, IPU-17-ARA-945 ; paratypes 3 ♀ same data as holotype, IPU-17-ARA-946, IPU-17-ARA-956, IPU-17-ARA-957 .

Diagnosis: Females of I. chilika differs from all other congers by having two prolateral macrosetae on tibiae I (in all other species three prolateral macrosetae), four dorsal macrosetae on tibiae III (in all other species dorsal macrosetae absent on tibiae III), and a distinct internal genitalia: anterior receptaculum horn-like with a broad, elongated base and pointed apex; ventral lobe with few shallow entapophyses; uterus externus weakly sclerotized and transparent; interpulmonary fold very wide and eye-like, strongly sclerotized forming a very conspicuous and well developed median flap, with prominent lateral extensions having ‘clear V-shaped’ inner margins; posterior receptaculum oval ( Fig. 12 A–D ).

Etymology: The species epithet is a noun in apposition, referring to the Chilika lake, where the type locality, Barkud Island is located.

Description of holotype female (IPU-17-ARA-945) ( Fig. 11 , 12 ). Total length 6.25; carapace.3.10 long, 1.94 wide; abdomen 3.15 long, 2.13 wide; carapace covered with long and short brown hairs, relatively more on caput; clypeus 0.29 high; ocular group 0.20 long, 0.74 wide; eye diameter ALE 0.12, PME 0.12, PLE 0.13; inter-distances PLE-PME 0.13, ALE-ALE 0.32; abdomen ventrally pale greyish without any pattern; labium 0.60 long, 0.43 wide; endites 1.14 long, 0.45 wide; sternum 1.84 long, 1.23 wide; leg measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 2.13, 0.91, 1.66, 1.59, 0.75,7.04; leg II: 1.99, 0.90, 1.53, 1.46, 0.63, 6.51; leg III: 1.52, 0.67, 0.98, 1.19, 0.48, 4.84; leg IV: 2.08, 0.92, 1.70, 1.40, 0.52, 6.62; palp: 0.82, 0.52, 0.41, -, 0.71, 2.46; leg formula 1423; macrosetae: leg I: fep 1, tip 1-1, v 2-2-2, mtvp 1-0-1, vr 1-1-1; leg II: fep 1, tip 1-1, vp 0-0-1, vr 1-0-1, mt p 1, vp 0-0-1, vr 1-1-1; leg III: ti d 2-2, vp 0-0-0, vr 0-0-1, mt d 2-2, vp 0-0-1,vr 1-1-1; leg IV: ti vp 0-0-0, vr 0-0- 1, mt vp 1-0-1, vr 0-0-0, preening comb with four ventro-retrolateral macrosetae on metatarsi IV; palp: ti p 2-2-2, ta p 12; teeth on paired claws of legs: I: 20, II: 16, III: 10, IV: 9; female genitalia distinct; external genitalia in the form of sclerotized plate; internal genitalia with a horn-like anterior receptaculum having broad, elongated base and pointed apex; dorsal lobe spherical; ventral lobe with few shallow entapophyses; uterus externus weakly sclerotized and transparent; interpulmonary fold very wide and eye-like, strongly sclerotized forming a very conspicuous and well developed median flap, with prominent lateral extensions having ‘clear V-shaped’ inner margins; posterior receptaculum oval ( Fig. 12 A–D ). Remaining characters same as I. malkangiri female.

Variation in females [n=4, measurements: range (mean±standard deviation)]. Total length 6.25–6.84 (6.50±0.26), carapace. 2.60–3.37 (2.92±0.38) long, 1.65–2.22 (1.88±0.26) wide; abdomen 3.15–3.94 (3.58±0.35) long, 2.13–2.32 (2.23±0.08) wide; clypeus 0.24–0.29 (0.28±0.02) high; ocular group 0.20–0.25 (0.24±0.03) long, 0.62–0.77 (0.70±0.07) wide; eye diameter ALE 0.12–0.13 (0.12±0.01), PME 0.12–0.13 (0.12±0.01), PLE 0.12–0.13 (0.12±0.01), inter-distances PLE-PME 0.08–0.13 (0.10±0.02), ALE-ALE 0.26–0.32 (0.30±0.03); labium 0.45–0.61 (0.54±0.08) long, 0.37–0.49 (0.42±0.05) wide, endites 0.84–1.14 (0.99±0.15) long, 0.35–0.45 (0.41±0.05) wide; sternum 1.50–2.02 (1.72±0.25) long, 1.01–1.35 (1.16±0.16) wide; leg and palp measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 1.68–2.28 (1.97±0.29), 0.68–0.98 (0.82±0.15), 1.30–1.66 (1.52±0.21), 1.21–1.62 (1.42±0.21), 0.64–0.80 (0.72±0.07), 5.51–7.04 (6.44±0.92); leg II: 1.54–2.01 (1.80±0.24), 0.66–0.98 (0.82±0.14), 1.18–1.60 (1.39±0.21), 1.18–1.52 (1.34±0.17), 0.57–0.72 (0.64±0.06), 5.13–6.83 (5.98±0.82); leg III: 1.24–1.65 (1.43±0.19), 0.59–0.74 (0.66±0.06), 0.67–0.98 (0.81±0.14), 0.85–1.23 (1.05±0.19), 0.46–0.51 (0.47±0.03), 3.78–4.99 (4.42±0.59); leg IV: 1.70–2.31 (1.96±0.29), 0.80–1.10 (0.92±0.13), 1.34–1.70 (1.56±0.22), 1.11–1.51 (1.29±0.19), 0.45–0.58 (0.51±0.06), 5.42–6.62 (6.23±0.88); palp: 0.61–0.82 (0.71±0.10), 0.35–0.52 (0.45±0.08), 0.32–0.43 (0.37±0.06), -, 0.52–0.71 (0.63±0.10), 1.85–2.46 (2.16±0.33).

Figures

FIGURE 11. Indoseges chilika sp. nov. ♀: A–C (IPU-17-ARA-945), A. Habitus, B. Sternum, maxillae, labium and labrum, C. Spinnerets; D–G SEM images, D. Eyes, E. Right chelicera, F. Claw of leg IV, F. Right palp prolateral view; Scale for A, B=1 mm, C=0.50mm, D, F, G=0.20mm, E=0.1mm.

FIGURE 12. Indoseges chilika sp. nov. ♀: A–D (IPU-17-ARA-945), A, C. Internal genitalia ventral view, B, D. Same lateral view; Scale for A–D=0.2mm.