Idiops oriya, Gupta, Neha, Ganeshkumar, M., Das, Sanjay Keshari & Siliwal, Manju, 2013

Gupta, Neha, Ganeshkumar, M., Das, Sanjay Keshari & Siliwal, Manju, 2013, Three new species of Idiops Perty, 1833 (Araneae: Idiopidae) from India, Zootaxa 3635 (3), pp. 237-250 : 247-249

Idiops oriya sp. nov. Siliwal

( Figs 4 A–E, Table 3 )

Type specimen. Holotype female. INDIA: Odhisa: Kapilas, Dhenkanal, [19°44′39.1′′N & 83°0 6′34.8′′E], 0 6 August, 2007, elev. 280 m, coll. Saroj Behera (WILD-07-ARA-198).

Diagnosis. The new species resembles I. pylorus and I. madrasensis and differs from rest of the South and South-east Asian Idiops sp. in females having leg formula 4123. Females differs from those of I. pylorus by having ocular area longer than wide and those of I. pylorus and I. madrasensis in spermathecae structure being ice-cream cone-shaped ( Fig. 4 E).

Etymology. The species epithet refers to the vernacular language spoken in the type locality state, Odhisa.

Description. Total length 16.66. Carapace 7.38 long, 5.97 wide; chelicerae 33.60 long; abdomen 9.28 long, 6.99 wide. Spinnerets: PMS, 1.02 long, 0.38 wide, 0.17 apart; PLS, 1.09 basal, 0.31 middle, 0.21 distal; midwidths 0.99, 0.77, 0.36 respectively; 1.61 total length.

Colour in alcohol. Carapace, patellae, tibiae, metatarsi and tarsi of legs I–II and patella and tarsus of palp blackish-brown, other leg parts reddish-brown. Abdomen dorsally grayish-brown, mottled with yellowish spots; ventrally uniformly yellowish-brown. AME encircled with black patch.

Carapace ( Fig. 4 A). Glabrous, broader anteriorly (widest between legs II) and gradually narrowing posteriorly, striae prominent; fovea, procurved, deep. Bristles: 2 long and 2 short on caput; 2 short between AME- ALE; 3 short on clypeus edge.

Eyes ( Fig. 4 B). Eight in three rows, ALE situated far from AME on clypeal edge; posterior row procurved. Ocular group 1.75 long, 1.45 wide; MOQ not square, 0.64 front and 0.82 back width, 0.69 long. Diameter AME 0.22, PME 0.17, ALE 0.25, PLE 0.24; distance between ALE-AME 0.62, AME-AME 0.05, PME-PME 0.06, ALE- PLE 0.90, PLE-PME 0.43 and ALE-ALE adjacent.

Maxillae ( Fig. 4 C). 2.30 long anteriorly, 2.87 long posteriorly, 1.68 wide; ca. 50 cuspules distributed towards anterior edge; anterior lobe distinct.

Labium ( Fig. 4 C). 0.99 long, 1.37 wide, shallow labiosternal groove, slightly procurved, 1 large and 4 small cuspules on anterior edge.

Chelicerae ( Figs 4 C–D). 9 promarginal teeth, 8 retomarginal teeth; rastellum strong, raised on high triangular mound, consist of 16 thick, short spines with many bristles-like spines; two glabrous bands for length of dorsal surface of chelicerae.

Sternum ( Fig. 4 C). Broader between posterior coxae; reddish-brown, elevated in centre, sloping laterally, covered with long black hair; row of long bristles on margins, posterior angle blunt.

Sigilla ( Fig. 4 C). Posterior sigilla absent; median pair submarginal, 2.04 apart, 0.30 from margin and anterior pair round, marginal.

Legs. Leg III thicker than other legs; femora III clearly wider than others; metatarsi of all legs longer than tarsi. Legs cylindrical except for metatarsi and tarsi of legs I–II and tibiae and tarsi of palp, dorsoventrally flattened, covered with few scattered hair, bristles and few curved, thick, thorn-like spines. Two conspicuous glabrous bands for length of femora, patellae and tibiae. Scopulae absent on all legs and palp. Leg formula 4123.

Spines. More on promarginal and retromarginal sides of legs and palp. I: ti, p=18, r=22; mt, p=22, v=2, r=19; ta, p=8, v=3, r= 10. II: ti, p=10, v=8, r=5; mt, p=11, v=7, r=9; ta, p=7, v=3, r= 4. III: pa, p=9, r=2; ti, p=9, v=2, r=7; mt, p=10, v=6, r=7; ta, v= 10. IV: pa, p=11; ti, v=2; mt, v=7; ta, v=9. Palp: pa, v=1; ti, p=11, r=7; ta, p=14, v=5, r=10.

Trichobothria. Clavate absent; ta I, 12 long filiform in each of two zig-zag rows for basal 3/4th; ta II, 9 long filiform; ta III–IV, 10 long filiform; palp, 22 short filiform for length. Mt I, 13 short filiform; mt II, 7 short filiform; mt III, 9 filiform; mt IV, 16 short filiform. Trichobothria on tarsi in two zig-zag rows in basal 3/4th and trichobothria on metatarsi for length.

Leg coxae. Reddish-brown; coxae I–IV covered with long black bristles, more dense on anterior pairs. Coxae III–IV with central patch glabrous, others sparsely covered with long and short bristles. Coxae IV clearly broader than others, anterior edge curved.

Claws. Paired claw on all legs with single tooth and palp with bifid tooth; unpaired claw on leg I–IV; all claws (paired as well as unpaired) leg IV distinctly larger in size than claws on leg I–III. False claw tufts on each side of paired claws.

Abdomen ( Fig. 4 A). Dorsum, grayish-brown heavily mottled with yellowish spots; uniformly covered with short and long black hairs, cuticle appears leathery and slightly rough. Venter uniformly yellowish-brown, evenly covered with short black hairs, intermixed with few long black hairs.

Spinnerets. PMS digitiform covered with brown hair; PLS covered with brown hair, apical segment domed.

Spermathecae ( Fig. 4 E). Two single lobes facing away from each other; each lobe, distally bulge with notch at tip, resembling teats in mammals, sclerotized, covered with pores, otherwise lobes transparent, gradually narrowing (cone shape) and opens ventrally; transparent sheet of inverted triangular shape covers basal half of lobes.

Natural history. The spider was found on a roadside cutting in a deciduous sacred grove. It was found sympatric with Heligmomerus barkudensis (Gravely, 1921) in Kapilas, Odhisa. Only a single female was found and so their population seems to be low as compared to H. barkudensis . More information on habitat can be seen in Siliwal et al. 2010.

The burrow of this species was simple tube-like with thick silk linning, measuring about 15.0mm in diameter and 55mm in depth. Burrow was having vertical on the ground with a gentle slope. Like Heligmomerus barkudensis , entrance of the burrow had a hinge door (diameter 13.5mm), inside of which covered with thick layer of silk with claw markings in the center and outer side covered with soil particles and debris.

Figures

FIGURE 4. Idiops oriya sp. nov., female (WILD- 07 - ARA- 198). A, Cephalothorax and abdomen; B, Eyes; C, Sternum, maxillae, chelicerae and labium; D, Chelicerae; E, Spermathecae. Scale 1.0 mm for A – E.

Tables

TABLE 3. Morphometry of legs and palp of Idiops oriya sp. nov. from Uttara Kannada, Karnataka, holotype (WILD- 07 - ARA- 198).

	LEG I	LEG II	LEG III	LEG IV	PALP
Femur	5.22	4.64	3.44	5.53	3.58
Patella	3.38	2.94	2.94	3.64	2
Tibia	3.76	2.63	2.01	3.85	2.3
Metatarsus	2.27	2.18	2.53	4.26	0
Tarsus	1.22	1.3	1.77	2.02	2.63
Total	15.85	13.69	12.69	19.3	10.51
Midwidth
Femur	1.38	1.28	1.93	1.37	0.94
Tibia	1.68	1.3	1.69	1.47	1.91