Teutamus orthogonus, Dankittipakul, Pakawin, Tavano, Maria & Singtripop, Tippawan, 2012

Dankittipakul, Pakawin, Tavano, Maria & Singtripop, Tippawan, 2012, Seventeen new species of the spider genus Teutamus Thorell, 1890 from Southeast Asia (Araneae: Liocranidae), Journal of Natural History 46, pp. 1689-1730 : 1711-1713

Teutamus orthogonus sp. nov.

( Figures 1 A, 2 A, 3 E, 11 A–E)

Diagnosis

Somatically, T. orthogonus sp. nov. bears little resemblance to its congeners; it has a distinctly shorter epigastric scutum ( Figure 1 A) and a reduced number of spines on anterior legs. Males resemble those of T. rhino in having an elongate tegulum but the conductors are conical rather than spiniform ( Figure 11 A); females share close similarities on the epigyne but can be distinguished by the rhomboidal spermathecae and the straight proximal portion of the insemination ducts ( Figure 11 E).

Type material

Holotype. ♂, Indonesia: Sumatra, Jambi Province: Mt Kirinci, foot path to the summit, west of Kersik Tua , 2160 m, evergreen hill forest , 17 February 2000, leg. P.J. Schwendinger ( MHNG, Sum-00 / 13) .

Paratypes. Data as holotype, 3♂, 2♀ ( MHNG, Sum-00 / 13) .

Etymology

The specific epithet is latinization of a Greek word (oρ ϑ o ζ (orthos) = straight), referring to the straight proximal portion of insemination ducts.

Description

Male (holotype). Total length 4.86; prosoma 2.36 long, 1.52 wide; opisthosoma 2.50 long, 1.26 wide. Leg formula: 1423; I 10.76 (2.44, 0.92, 3.42, 2.36, 1.62); II 8.56 (2.02, 0.90, 2.64, 1.88, 1.12); III 7.16 (1.62, 0.92, 2.12, 1.54, 0.96); IV 10.56 (2.58, 0.92, 2.88, 2.62, 1.56). Spination: Leg I: Femora p1-1; tibiae p7 r7; metatarsi p4 r4. Leg II: Tibiae p7 r6; metatarsi p4 r3. Carapace reddish brown; submarginal lobes blunt, slightly elevated ( Figure 1 A). Sternum reddish brown. Legs hairless, bi-coloured: Femora to tarsi yellowish, other segments reddish brown. Opisthosoma elongateovoid. Dorsal scutum covering almost two-thirds length of opisthosoma, indented posteriorly. Epigastric scutum short ( Figure 2 A). Post-epigastric scuta extending half length of opisthosoma.

Palp ( Figure 11 A–C): RTA triangular, strongly excavated medially, its apex blunt, anterior margin with colourless and transparent lamina. DTA digitiform, weakly sclerotized. Tegulum elongate-ovoid, slightly protruding posteriorly. Conductor triangular, its apex sharply pointed, gradually narrowing anteriorly. Embolic base clearly visible.

Female (paratype, MHNG, MAL-04/01): Total length 5.78; prosoma 2.62 long, 1.58 wide; opisthosoma 3.16 long, 1.60 wide. Leg formula: 1423; I 11.30 (2.48, 0.92, 3.88, 2.56, 1.46); II 8.76 (2.00, 0.92, 2.94, 1.72, 1.18); III 7.66 (1.66, 0.90, 2.14, 1.76, 1.20); IV 10.96 (2.54, 0.94, 3.18, 2.68, 1.62). Spination: Leg I: Femora p1-1; tibiae p7 r7; metatarsi p4 r4. Leg II: Tibiae p7 r7; metatarsi p4 r3. General appearance as in male; legs reddish brown, uniform in colour; dorsum of opisthosoma dark greenish, posteriorly with a series of pale chevrons.

Genitalia ( Figure 11 D,E): Epigyne with circular copulatory orifices situated anterior medially. Insemination ducts descending obliquely then ascending anteriorly, connected to apical portion of spermathecae. Spermathecae trapezoidal, strongly narrowed and elongated anteriorly. Fertilization ducts lanceolated.

Distribution

Known only from the type locality on the west coast of Sumatra ( Figure 18).

Figures

Figure 1. Teutamus orthogonus sp. nov., male holotype (A). Teutamus jambiensis, male paratype (MHNG) (B). Teutamus rama sp. nov., male holotype (C). Teutamus seculatus sp. nov., male holotype (D). Teutamus brachiatus sp. nov., male holotype (E). Teutamus lioneli sp. nov., male paratype (F). (A – F) Prosoma, dorsal.

Figure 2. Teutamus orthogonus sp. nov., male holotype (A). Teutamus jambiensis, male paratype (MHNG) (B). Teutamus andrewdavisi, male paratype (MHNG) (C). Teutamus politus, male (D, I) from southern Thailand, female holotype (MSNG) (E). Teutamus brachiatus sp. nov., male paratype (F). Teutamus lioneli sp. nov., male paratype (G). Teutamus hirtellus sp. nov., male holotype (H). (A – G) Habitus, dorsal and (H) ventral; (I) opisthosoma, ventral. Abbreviations: ES, epigastric scutum; PS, post-epigastric scutum; SM, submarginal lobe.

Figure 11. Teutamus orthogonus sp. nov., male holotype (A – C), female paratype (D, E). (A) Male palp, ventral, (B) prolateral and (C) retrolateral; (D) epigastric region, ventral; (E) internal genitalia, dorsal. Scale bars 0.25 mm.