Jacaena lunulata, Dankittipakul, Pakawin, Tavano, Maria & Singtripop, Tippawan, 2013

Dankittipakul, Pakawin, Tavano, Maria & Singtripop, Tippawan, 2013, Revision of the spider genus Jacaena Thorell, 1897, with descriptions of four new species from Thailand (Araneae: Corinnidae), Journal of Natural History 47 (23), pp. 1539-1567 : 1556-1559

Jacaena lunulata sp. nov.

( Figures 1 B, H, 2 B, C, 3 A–C, E, 4 D–F, 6 A–C, 7 C, 8 G, 9 D, E, 12)

Sesieutes erawan Deeleman-Reinhold, 2001: 464, ♂ from Doi Inthanon. Misidentification.

Sesieutes schwendingeri Deeleman-Reinhold, 2001: 461 , ♂♂ from Doi Inthanon and Doi Suthep. Misidentification.

Type material

Holotype: ♂, Thailand: Chiang Mai Province, Chomthong District, Doi Inthanon NP, Doi Inthanon , evergreen hill forest, 1600–1680 m, extraction of soil sample, 11 January 2006, P. Dankittipakul leg. ( MHNG, PDC 5746 ) .

Paratypes: From type locality, pitfall trap, 25 March–23 April 2000, P. Dankittipakul leg., 1♀ ( MHNG, PDC 5747 ) ; litter sample, 10 September 2005, P. Dankittipakul leg., 2♂, 1♀, ( TNHM) ; evergreen hill forest, 1650 m, litter sample, 9 October 1999, P. Dankittipakul leg., 1♂ ( THNM, PDC 5748 ) . Doi Inthanon , evergreen hill forest, 1750 m, litter sample, 15 January 2000, P. Dankittipakul leg., 1♂ ( THNM, PDC 5749 ) . Doi Inthanon , evergreen hill forest, 1500 m, litter sample, 9 October 1999, P. Dankittipakul leg., 1♂, 2♀ ( THNM, PDC 5750 ) . Doi Inthanon , evergreen hill forest, 1250 m, 6 November 1985, P.J. Schwendinger leg., 1♂ ( MHNG, misidentified as S. erawan ) . Chiang Mai Province and District, Doi Suthep-Pui NP, Doi Suthep , 1200 m, 18 June 1987, P.J. Schwendinger leg., 1♀ ( MHNG, misidentified as S. schwendingeri ) . Doi Suthep , 960 m, pitfall trap, 31 November 1986 – 2 January 1987, P.J. Schwendinger leg., 1♂ ( RMNH, misidentified as S. schwendingeri ) .

Diagnosis

Males of J. lunulata sp. nov. are similar to those of J. schwendingeri comb. nov. but differ by having a crescent-shaped conductor that is distinctly broader and strongly curved backward ( Figures 6 A, 9 D, E), a tegulum that is greatly expanded, and the distal RTA of the male palp that is digitiform ( Figure 6 C). In comparison, in J. schwendingeri comb. nov. the conductor is narrower and its sharply pointed apex is abruptly bent ( Figure 4 A, C), the tegulum and the distal RTA are significantly smaller. Females can be distinguished by the rather simple internal genitalia, the ID of which consists of circular proximal ducts, the more convoluted ID, and the poorly defined spermathecae ( Figure 8 G cf. 8 F).

Etymology

The specific epithet is derived from Latin adjective (lunulatus = crescent-shaped), referring to the lamina-shaped conductor on the male palp.

Description

Male (holotype). Total length 6.6. Carapace 3.2 long, 2.5 wide. Opisthosoma 3.4 long, 2.0 wide. Eye sizes and interdistances: AME 0.15; ALE 0.13; PME 0.10; PLE 0.13; AME–AME 0.06; AME–ALE 0.05; PME–PME 0.15; PME–PLE 0.16. MOQ 0.33 long; front width 0.33; back width 0.35. Leg formula 4123. Spination. Leg I: femur 1–1pl; tibia 8pl 7rl; metatarsus 4pl 4rl. Leg II: tibia 7pl 6rl; metatarsus 4pl 4rl. Leg III: tibia 1– 1v 1pl; metatarsus 1– 1v 1pl. Leg IV: tibia 1–2– 2v 1–1rl; metatarsus 1–1–1– 1v 1pl 1rl. Leg measurements: Leg I 8.1 (2.3, 0.9, 2.2, 1.8, 0.9); II 7.5 (2.1, 0.9, 1.9, 1.7, 0.9); III 6.7 (1.9, 0.9, 1.4, 1.6, 0.9); IV 9.4 (2.6, 1.0, 2.1, 2.5, 1.2).

Colouration and pattern ( Figure 1 B): Carapace dark chestnut-brown; integument coarsely granulated. Chelicerae, sternum, labium and gnathocoxae dark reddishbrown. Coxae, trochanters and femora dark brown; patellae and tibiae brown, distal part of tibiae orange; metatarsi I–II brown, III–IV orange; tarsi orange. Opisthosoma ovoid; dorsum of opisthosoma dark grey, with pattern consisting of one pair of pale patches, followed by four transverse chevrons and pale area above spinnerets. Dorsal scutum occupying approximately one-third of opisthosoma length, posterior margin rounded, with oval extensions fusing with dorsal muscle apodemes.

Palp ( Figures 6 A–C, 9 D, E, 12 A–C): Proximal RTA triangular in ventral view ( Figure 12 A); apical surface partially membranous, slightly excavated, forming shallow concavity ( Figure 9 D, E). Distal RTA digitiform, its apex blunt ( Figures 6 C, 12 A, C). Conductor ( Figures 6 A, 9D, E, 12 A–C) crescent-shaped, enlarged and broad, semi-transparent, with heavily pigmented outer margin, sharply pointed apex curving backwards. Tegular apophysis hyaline, lanceolate, originating behind base of conductor, aligning with tip of embolus ( Figures 6 A, 9 D).

Female (paratype, NHML, PDC 5747). Total length 8.1. Carapace 3.3 long, 2.5 wide. Opisthosoma 4.5 long, 2.7 wide. Eye sizes and interdistances: AME 0.11; ALE 0.13; PME 0.08; PLE 0.13; AME–AME 0.08; AME–ALE 0.05; PME–PME 0.15; PME– PLE 0.16. MOQ 0.38 long; front width 0.31; back width 0.35. Leg formula 1423. Spination. Leg I: femur 1–1pl; tibia 8pl 7rl; metatarsus 4pl 4rl. Leg II: tibia 7pl 6rl; metatarsus 4pl 4rl. Leg III: tibia 2– 1v 1pl; metatarsus 1– 1v 1pl. Leg IV: tibia 1–1– 2v 1rl; metatarsus 1–1–1– 1v 1pl 1rl. Leg measurements: Leg I 8.6 (2.3, 1.0, 2.3, 2.0, 1.0); II 7.9 (2.2, 1.0, 1.9, 1.8, 1.0); III 6.6 (1.8, 2.8, 1.5, 1.5, 1.0); IV 8.3 (2.3, 0.8, 2.0, 2.2, 1.0).

Colouration and pattern ( Figure 2 B): Carapace dark chestnut-brown; integument coarsely granulated. Chelicerae, sternum, labium and gnathocoxae dark reddishbrown. Legs I–II brown, femora slightly darker than other segments, tibiae orangebrown distally; legs III–IV orange-brown except femora dark brown. Opisthosoma elongate-ovoid; dorsum grey, with pair of pale patches connected anteriorly, followed by four chevrons and pale area above spinnerets (first pair very faint and narrowed, disconnected medially).

Copulatory organ ( Figures 7 C, 8 F, 12 D, E): Copulatory orifices situated medially on heavily sclerotized epigynal region ( Figures 7 C, 12 D). Proximal half of insemination ducts forming two loops encircling copulatory ducts ( Figures 8 G, 12 E); inner loop distinctly enlarged, filled with dark substance ( Figure 8 G); distal half of ducts ascending anteriorly then traversing and descending to connect with poorly defined spermathecae ( Figures 8 G, 12 E); glandular pores situated at anterior margin of spermathecae ( Figure 12 E, GF).

Natural history

Types of this new species were collected in evergreen hill forests of Doi Suthep and Doi Inthanon between 1250 and 1750 m.

Distribution

Chiang Mai Province, northern Thailand.

Figures

Figure 1. Males of Jacaena spp., habitus, dorsal (A – H). Jacaena schwendingeri comb. nov., holotype (A); J. lunulata sp. nov., holotype (B); J. punctata sp. nov., holotype (C); J. mihun (D); J. erawan comb. nov. (E); J. thakek comb. nov., holotype (F); J. schwendingeri comb. nov. (G); J. lunulata sp. nov., paratype (H). DS, dorsal scutum.

Figure 2. Females of Jacaena spp., habitus, dorsal (A – H). Jacaena schwendingeri comb. nov., paratype (A); J. lunulata sp. nov., paratypes (B, C); J. angoonae sp. nov., holotype (D); J. punctata sp. nov., paratypes (E, F); J. mihun (G); J. peculiaris sp. nov., holotype (H).

Figure 4. Jacaena spp. Male palps, ventral (A, D, G). Ditto, prolateral (B, E, H). Ditto, retrolateral (C, F, I). Jacaena schwendingeri comb. nov., holotype (A – C); J. lunulata sp. nov., paratype (originally misidentified as Sesieutes schwendingeri) (D – F); J. mihun, holotype (G – I).

Figure 6. Jacaena spp. Male palps, ventral (A). Ditto, prolateral (B). Ditto, retrolateral (C). Internal copulatory organ, anterior part, dorsal (D). Ditto, showing proximal chamber and secretory ampulla (E). Internal copulatory organ (middle portion of insemination duct removed on right spermathecae, showing connection between copulatory orifice and insemination duct) (F). Jacaena lunulata sp. nov., holotype (A – C); J. peculiaris sp. nov., paratype (D); J. punctata sp. nov., paratype (E); J. mihun (F). AM, secretory ampulla. CH, semi-transparent chamber. CO, copulatory orifice. F, fertilisation duct.

Figure 7. Jacaena spp. Epigynal region, ventral (A – F). Jacaena schwendingeri comb. nov., paratype (A); J. punctata sp. nov., paratype (B); J. lunulata sp. nov., paratype (C); J. mihun (D); J. angoonae sp. nov., holotype (E); J. peculiaris sp. nov., holotype (F).

Figure 8. Jacaena spp. Internal copulatory organ, dorsal (A – G). Jacaena mihun (A – D); J. angoonae sp. nov., holotype (E); J. schwendingeri comb. nov., paratype (F); J. lunulata sp. nov., paratype (G).

Figure 9. Jacaena spp. Distal part of male palp, ventral, showing conductor, tip of embolus and tegular apophysis (A, D). Ditto, retrolateral (B). Ditto, prolateral (C, E). Jacaena schwendingeri comb. nov., holotype (A – C); J. lunulata sp. nov., holotype (D, E). C, conductor. E, embolus. TA, tegular apophysis.

Figure 12. Jacaena lunulata sp. nov., holotype, male (A – C) and paratype, female (D, E). Male palp, ventral (A). Ditto, prolateral (B). Ditto, retrolateral (C). Epigyne, ventral (D). Internal copulatory organ, dorsal (E). AM, secretory ampulla; dRTA, distal process of retrolateral tibial apophysis; EB, embolic base; GP, glandular pore on spermathecae; ID, insemination duct. pRTA, proximal process of retrolateral tibia apophysis; S, spermatheca.