Corinnomma severum ( Thorell, 1877 )

Sankaran, Pradeep M., 2021, A review of the Indian species of Apochinomma Pavesi, 1881 and Corinnomma Karsch, 1880, synonymy of Castianeira quadrimaculata Reimoser, 1934, and a catalogue of the Indian corinnid fauna (Arachnida: Araneae), Zootaxa 5072 (6), pp. 541-559 : 548-551

Corinnomma severum ( Thorell, 1877)

Figs 7–8

Corinna severa Thorell, 1877: 481 (♂).

Corinnomma severum Karsch, 1880: 375 (for complete list of references, see World Spider Catalog 2021).

Type material. Holotype ♂ from INDONESIA: Southeast Sulawesi: Kendari (03°59’S, 122°30’E; 3 m a.s.l.), leg. O. Beccari, 1874, repository MSNG (register number unknown), not examined (illustrations and images of the male palp given in Deeleman-Reinhold [1993: fig. 16, 2001: fig. 469] and Wang et al. [2012: fig. 2E–G] are diagnostic and were used for comparative purposes).

Other material examined. INDIA: Kerala: Malappuram, Akambadam (11°18’37.42’’N, 76°12’31.68’’E; 41 m a.s.l.), 16 May 2013, leg. M.S. Pradeep, from foliage, by hand: 1♂ ( ADSH22171 ) ; Ernakulam, Illithodu (10°11’55.94’’N, 76°33’00.57’’E; 24 m a.s.l.), 15 May 2014, leg. M.S. Pradeep, from foliage, by hand: 2♂ ( ADSH22172 ) . Tamil Nadu: Salem, Yercaud (11°46’29.25’’N, 78°12’34.94’’E; 1420 m a.s.l.), 28 May 2019, leg. M.S. Pradeep, from foliage, by hand: 1♂ ( ADSH22173 ) .

Diagnosis. Males of C. severum are closely related to the males of C. thorelli Simon, 1905 in the general morphology of the palp, but can be distinguished by a distally narrow embolus, which is as wide as long in C. thorelli (compare Figs 7E–F , 8A–C with Deeleman-Reinhold 1993: fig. 27).

Redescription. Male in alcohol (ADSH22172, Fig. 7A–C ). Carapace, eye region, clypeus, chelicerae, sternum, opisthosoma brownish-black; scuta and sclerites brownish; leg segments brownish to pale brownish, with black shades; femora with white patches and bands; palp segments pale brownish, with black shades; spinnerets black. Carapace rugose, clothed with fine white appressed hairs. Fovea longitudinal, straight. Chilum inverted triangular, bipartite ( Fig. 7C ). Cheliceral promargin with three teeth, median largest, proximal and distal small; retromargin with two equally sized teeth. Endites with well-developed scopulae. Sternum rebordered, rugose, clothed with white hairs, with coxal and intercoxal extensions. Pedicel with collar; collar dorsally incomplete. Opisthosoma tubular with slight median constriction, clothed with fine white hairs forming broad transverse bands and patches; dorsal scutum complete, fused with collar; epigastric scutum fused with collar ( Fig. 7B ); post epigastric sclerites narrow ( Fig. 7B ); venter provided with a broad median rectangular sclerite ( Fig. 7B ); tracheal scutum triangular ( Fig. 7B ). Body length 11.72. Carapace length 5.81, width 3.78. Opisthosoma length 5.91, width 2.73. Chilum length 0.67, width 0.12. Eye diameters: ALE 0.19, AME 0.31, PLE 0.28, PME 0.25. Eye interdistances: AME–ALE 0.05, AME–AME 0.19, AME–PME 0.15, ALE–PLE 0.03, PME–PLE 0.14, PME–PME 0.32. Clypeus height at AMEs 0.42, at ALEs 0.45. Length of chelicerae 2.16. Measurements of palp and legs: Palp 4.73 [1.55, 0.70, 0.79, 1.69], I 15.54 [4.34, 1.44, 4.17, 3.61, 1.98], II 15.29 [4.34, 1.61, 3.85, 3.51, 1.98], III 13.80 [3.93, 1.53, 3.15, 3.48, 1.71], IV 19.42 [5.43, 1.64, 4.57, 5.80, 1.98]. Leg formula: 4123. Spination of palp: femur pld 1 do 2, patella pld 1 do 2, tibia pl 1 pld 1 rld 1, tarsus/cymbium pld 1 plv 3; legs: femur I–II pld 2 do 3 rld 1, III pld 2 do 3 rld 3, IV pld 1 do 3 rld 3; patella I–IV spineless; tibia I plv 3 rlv 3, II plv 3 rlv 2, III pl 2 plv 2 do 1 rld 2 rlv 3, IV pl 2 plv 3 do 1 rl 1 rld 1 rlv 3; metatarsus I–II plv 2 rlv 2, III pld 2 plv 3 rld 3 rlv 3 vt 1, IV pld 3 plv 3 rl 1 rld 3 rlv 2 vt 1; tarsus I–IV spineless. Palp ( Figs 7D–F , 8A–C ): cymbium retrobasally with paracymbial spine ( Fig. 8B–C ; PS). Tegulum pear-shaped, with oblique, weak apical depression, with brown, less coiled sperm duct ( Figs 7D–F , 8A–C ; SD, T). Subtegulum less sclerotised, prominent ( Figs 7D, F , 8A, C ; ST). Embolus short, with slightly broad proximal part, first directed retrolaterally and then prolaterally ( Figs 7E–F , 8A–C; E ), with blunt tip, directed at 12-o’ clock position ( Figs 7E , 8B ).

Female. For description and illustrations of the female, see Deeleman-Reinhold (2001) and Wang et al. (2012).

Variation. Male (n=4): body length 9.24–11.82.

Figures

FIGURE 7. Corinnomma severum (Thorell, 1877), male (ADSH22172): A habitus, dorsal view; B opisthosoma, ventral view; C prosoma, frontal view; D–F left palp in prolateral (D), ventral (E) and retrolateral (F) views. Abbreviations: ES—epigastric scutum; PES—post-epigastric sclerite; TS—tracheal scutum; VS—ventral sclerite. Scale bars: A–B = 2 mm; C = 1 mm; D–F = 0.5 mm.

FIGURE 8. Corinnomma severum (Thorell, 1877), male (ADSH22172): A–C left palp in prolateral (A), ventral (B) and retrolateral (C) views. Abbreviations: E—embolus; PS—paracymbial spine; SD—sperm duct; ST—subtegulum; T—tegulum; TN—tegular neck. Scale bars: A–C = 0.5 mm.