Bioacoustics of Indoseges sushildutta

Description of holotype male (IPU-17-ARA-560) ( Fig. 6–8 ) . Total length 7.37; carapace.3.87 long, 2.54 wide; abdomen 3.50 long, 3.20 wide; clypeus 0.23 high; ocular group 0.31 long, 0.81 wide; eye diameter ALE 0.17, PME 0.17, PLE 0.17; inter-distances PLE-PME 0.11, ALE-ALE 0.33; chelicerae retrolaterally with one blunt tubercle at base; labium 0.82 long, 0.53 wide; endites 1.44 long, 0.52 wide; sternum 2.30 long, 1.44 wide; metatarsi Iwith a single row of small cuspule like ventral macrosetae on distal half; tibiae Iwith a row of short macrosetae on ventro-retrolateral side ( Fig. 7 A ), and a distinct pointed basal prolateral apophysis ( Fig. 7 A–C ); femur Iwith a distinct triangular tubercle-like prolateral femoral apophysis covered by a cluster of stridulatory spines on distal face ( Fig. 7 A–C ); leg and palp measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 2.93, 1.00, 3.40, 2.64, 1.34, 11.31; leg II: 2.85, 1.11, 2.73, 2.56, 1.18, 10.43; leg III: 2.14, 0.87, 1.37, 1.74, 0.88, 7.00; leg IV: 2.70, 1.22, 2.29, 1.24, 0.75, 9.20; palp: 1.10, 0.52, 0.81, -, 0.65, 3.08; Leg formula 1243; macrosetae: leg I: fe p 1-1, v 23, tip 1-1-1, r 1-1-1-1-1-1, vp 1-1, vr 1-1-1-1-1-1-1-1-1-1-1-1, mtvp 1-1-1, vr 1-0-1; leg II: fep 1, v 1, ti p 1-1-1, r 1-1-1, vp 1, vr 1-1-1-1-1-1-1-1-1-1, mtp 1,vp 1, vr 1-1-1-1-1; leg III: fep 1, tid 2-2, vp 0-0-1, vr 1-1-1, mt d 2-2, vp 0-0-2, vr 1-1-1; leg IV: fe d 1-1, ti vp 1-1-1, vr 0-0-1 mt vp 1-0-1, vr 0-0-0, preening comb with four ventro-retrolateral macrosetae on metatarsi IV ( Fig. 7 D ); palp: no spine; teeth on paired claws of legs: I: 12, II: 11, III: 8, IV: 8. Palp patella and tibia slightly incrassate; embolus at the base twists 110° along with distal bulb ( Fig. 8 A-D). Rest of the characters same as in the male of I. malkangiri . Variation in males [n=2; measurements: range]. Total length 7.09–7.37; carapace 3.41–3.87 long, 2.29–2.54 wide; abdomen 3.50–3.68 long, 2.00–3.20 wide; clypeus height 0.18–0.23; ocular group 0.30–0.31 long, 0.73– 0.81 wide; eye diameter ALE 0.12–0.17, PME 0.15–0.17, PLE 0.16–0.17; inter-distances PLE-PME 0.10–0.11, ALE-ALE 0.30–0.33; labium: 0.66–0.82 long, 0.43–0.53 wide; endites: 1.20–1.44 long, 0.46–0.52 wide; sternum: 2.00–2.30 long, 1.32–1.44 wide; leg and palp measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 2.71–2.93, 0.89–1.00, 2.99–3.40, 2.26–2.64, 1.20–1.34, 10.05–11.31; leg II: 2.61–2.85, 0.98–1.11, 2.44–2.73, 2.27–2.56, 1.18–1.22, 9.42–10.43; leg III: 1.91–2.14, 0.82–0.87, 1.19–1.37, 1.63–1.74, 0.67–0.88, 6.22–7.00; leg IV: 2.48–2.70, 1.02–1.22, 2.02–2.29, 1.24–2.06, 0.74–0.75, 8.32–9.20; palp: 1.09–1.10, 0.50–0.52, 0.68–0.81, -, 0.55–0.65, 2.82–3.08. Description of paratype female (IPU-17-ARA-550) ( Fig. 9 , 10 ) . Total length 10.21; carapace.4.51 long, 2.81 wide; abdomen 5.70 long, 3.37 wide; carapace posterior border slightly concave, covered with few short hairs expect for long hairs in ocular area and few on caput; clypeus 0.30 high; eyes posterior row slightly recurved ( Fig. 9 D ); ocular group 0.28 long, 0.87 wide; eye diameter ALE 0.15, PME 0.15, PLE 0.16; inter-distances PLE-PME 0.15, ALE-ALE 0. 44; labium 0.81 long, 0.62 wide; endites 1.42 long, 0.62 wide; sternum 2.58 long, 1.64 wide; leg and palp measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 2.89, 1.16, 2.31, 2.03, 0.96, 9.35; leg II: 2.80, 1.25, 2.25, 2.01, 0.95, 9.26; leg III: 2.18, 0.95, 1.16, 1.57, 0.67, 6.53; leg IV: 2.95, 1.28, 2.31, 1.98, 0.66, 9.18; palp: 1.08, 0.63, 0.53, -, 0.88, 3.12; leg formula 1243; macrosetae: leg I: fep 1, tip 1-1-1, v 2-2-2, mt v 0-2-2; leg II: fep 1, tip 0-1-1, vp 0-0-0, vr 0-0-1, mtp 1, vp 0-0-1, vr 1-0-1; leg III: tip 1-1-0, r 1-1-1, vp 0-0-0, vr 0-0-1, mt d 2-2, vp 0-0-2, vr 1-1-1; leg IV: ti vp 0-0-0, vr 0-0-1, mt vp 1-1-2, vr 0-0-0, preening comb with four ventro-retrolateral macrosetae on metatarsi IV; palp: ti p 1-2-2, ta p 15; teeth on paired claws of legs: I: 17, II: 14, III: 9, IV: 9; female genitalia distinct; internal genitalia with a horn-like anterior receptaculum having broad, elongated base and gradually tapered apex; dorsal lobe spherical; ventral lobe with few shallow entapophyses; uterus externus weakly sclerotized and transparent; interpulmonary fold wide, nearly straight, strongly sclerotized forming a conspicuous, but short median flap; posterior receptaculum with irregular edges ( Fig. 10 A–E ). Remaining characters same as I. malkangiri female. Variation in females [n=7, measurements: range (mean±standard deviation)]. Total length 6.69–12.25 (9.72±1.52); carapace. 3.92–4.89 (4.36±0.28) long, 2.38–2.82 (2.63±0.16) wide; abdomen 4.88–7.36 (5.75±0.74) long, 2.47–4.33 (3.36±0.52) wide; clypeus 0.28–0.35 (0.31±0.02) high; ocular group 0.28–0.55 (0.34±0.09) long, 0.80–0.90 (0.85±0.04) wide; eye diameter ALE 0.15–0.17 (0.16±0.01), PME 0.13–0.15 (0.15±0.01), PLE 0.15–0.18 (0.16±0.01), inter-distances PLE-PME 0.10–0.17 (0.14±0.03), ALE-ALE 0.35–0.55 (0.41±0.06); labium 0.72–0.87 (0.80±0.06) long, 0.51–0.62 (0.59±0.04) wide; endites 1.32–1.58 (1.43±0.09) long, 0.49–0.65 (0.58±0.05) wide; Sternum 2.24–2.70 (2.49±0.14) long, 1.36–1.64 (1.55±0.09) wide; leg and palp measurements (femur, patella, tibia, metatarsus, tarsus, total length): leg I: 2.51–3.31 (2.88±0.22), 1.08–1.40 (1.20±0.10), 2.07–2.39 (2.25±0.09), 1.83–2.18 (1.99±0.10), 0.93–1.14 (1.02±0.10), 8.42–10.26 (9.34±0.50); leg II: 2.31–3.10 (2.69±0.22), 1.09–1.44 (1.23±0.10), 1.93–2.40 (2.17±0.14), 1.79–2.23 (1.98±0.13), 0.91–1.02 (0.98±0.04), 8.04–10.17 (9.05±0.59); leg III: 1.94–2.31 (2.13±0.11), 0.94–1.07 (0.98±0.05), 1.09–1.34 (1.20±0.09), 1.31–1.72 (1.51±0.12), 0.59–0.71 (0.66±0.04), 5.92–7.15 (6.48±0.34); leg IV: 2.61–3.28 (2.88±0.19), 1.17–1.45 (1.29±0.08), 2.04–2.46 (2.25±0.12), 1.70–2.16 (1.89±0.14), 0.66–0.83 (0.72±0.05), 8.25–10.18 (9.04±0.54); palp: 0.09–1.17 (1.05±0.08), 0.63–0.69 (0.65±0.02), 0.47–0.64 (0.53±0.05), -, 0.81–0.99 (0.91±0.08), 2.82–3.48 (3.14±0.21); preening comb with 3–4 ventro-retrolateral macrosetae on metatarsi IV; teeth on paired claws of all legs 9–17.

Diagnosis: Males of I. sushildutta differs from I. malkangiri by having capsule-like macrosetae on the ventral side of the distal half of metatarsi I (in I. malkangiri thorn-like macrosetae present); tibiae Iwith a row of short macrosetae on the ventro-retrolateral side (in I. malkangiri on the retrolateral side) ( Fig. 2 B , 7 A ) and a distinct pointed prolateral basal apophysis (in I. malkangiri , tibiae Ilacks any apophysis) ( Fig. 2 A–C , 7 A–C ); femur Iwith a distinct triangular tubercle-like prolateral femoral apophysis covered by a cluster of stridulatory macrosetae on the distal face (in I. malkangiri , femur Iwith a cluster of stridulatory macrosetae and lacks any apophysis) ( Fig. 2 A–D , 7 A–C ); leg formula 1243 (in I. malkangiri leg formula in male 2143); palpal tibiae slightly incrassate and embolus at the base twists 110° along with distal bulb (in I. malkangiri , distinctly incrassate and embolus at the base twists 90°) ( Fig. 3 A–D , 8 A–D ). Females of I. sushildutta differs from all other congers by having leg formula of 1243 (in all other species it is 1423), four ventral macrosetae on metatarsi I (in all other species five ventral macrosetae), and a distinct internal genitalia: anterior receptaculum horn-like with a broad, elongated base and gradually tapered apex; ventral lobe with few shallow entapophyses; uterus externus weakly sclerotized and transparent; interpulmonary fold wide, nearly straight, strongly sclerotized forming a conspicuous, but short median flap; posterior receptaculum with irregular edges ( Fig. 10 A–E ).