Sesieutes aberrans, Dankittipakul & Deeleman-Reinhold, 2013

Dankittipakul & Deeleman-Reinhold, 2013, Delimitation of the spider genus Sesieutes Simon, 1897, with descriptions of five new species from South East Asia (Araneae: Corinnidae), Journal of Natural History 47 (3), pp. 167-195 : 189-191

Sesieutes aberrans sp. nov.

( Figures 1 K, 3 I, 9 A–C)

Type material

Holotype. ♂, Thailand, Krabi Province, Khao Panom Bencha National Park, near Huay To Waterfalls , 220 m, rainforest, 22 July 2005. leg. P.J. Schwendinger ( MHNG, TH–05 / 10) .

Paratype. One ♂, data as holotype ( MHNG, TH–05 / 10) .

Diagnosis

Sesieutes aberrans sp. nov. is recognized by the very broad base of the conductor ( Figure 9B,C ), a feature that easily distinguishes it from its congeners.

Etymology

The specific epithet is a Latinized adjective in relation to the peculiar morphology of the male palp, which greatly deviates from other members of the genus.

Description

Male (holotype). Total length 5.68; prosoma 2.64 long, 1.84 wide; opisthosoma 3.00 long, 1.62 wide. Leg measurements: leg I 7.26 (1.98, 2.64, 1.52, 1.12); II 6.20 (1.66, 2.24, 1.30, 1.00); III 5.26 (1.52, 1.50, 1.32, 0.90); IV 8.06 (2.12, 2.50, 2.24, 1.18). Leg spination. Leg I: Fe p–1, Ti v–2–2 –2–2–2–2, Mt v–2–2 –2–2–2; leg II: Ti v–2–2 –2–2– 2–2–2, Mt v–2–2 –2–2; leg III: Ti p–1 v–1–1 –1–1 r–1, Mt p–1 v–1–1 r–1; leg IV: Fe d–1, Ti v–2–1 –1–2 r–1, Mt p–1, v–1–21 –1, r–1–1.

Pattern and coloration ( Figure 1K ). Carapace brown; in profile highest mid distance between PME and fovea; integument smooth and shiny, with few nodules situated along peripheral margin; fovea indistinct, replaced by large, circular depression; chelicerae, labium and gnathocoxae brown; sternum dark brown; legs bicolored, coxae to femora orange, patellae to tibia yellow, metatarsi and tarsi pale yellow. Opisthosoma elongate-ovoid, relatively narrowed; dorsum entirely covered with dorsal scutum; venter pale; dorsal scutum ovoid, heavily sclerotized, occupying entire length of opisthosoma; epigastric scutum heavily sclerotized, protruding anteriorly, forming ring collars, tightly fused with dorsal scutum.

Palp ( Figures 3 I, 9 A–C). Palpal tibia with small, triangular prolateral excrescence; proximal RTA truncated, with membranous area situated apically in ventral view, strongly elevated, represented by triangular projection with membranous anterior surface in prolateral view; distal RTA heavily sclerotized, triangular, relatively broad at base, apex slender, sharply pointed; tegulum greatly expanded posteriorly, with deep posterior excavation where embolic base originating; conductor very broad basally, gradually tapering anteriorly, originating on meso-retrolateral side of tegulum; tegular apophysis spiniform, hyaline, originating near base of conductor; embolus ribbon-shaped, gradually tapering distally, apex filiform.

Female. Unknown.

Natural history

Types of S. aberrans sp. nov. were collected in coastal rainforest.

Distribution

Known only from the type locality in southern Thailand.

Figures

Figure 1. Sesieutes spp., dorsal habitus (A – O). Sesieutes lucens Simon, male (A), female (B). Sesieutes minuatus sp. nov., holotype male (C), paratype female (D). Sesieutes abruptus sp. nov., holotype male (E), paratype female (F). Sesieutes bifidus sp. nov., holotype male (G), paratype female (H). Sesieutes apiculatus sp. nov., holotype male (I), paratype female (J). Sesieutes aberrans sp. nov., holotype male (K). Sesieutes sp. from Vietnam, male (L). Sesieutes sp. from Laos, male (M). Sesieutes borneensis Deeleman-Reinhold, male from Palawan (N). Sesieutes sp. from southern Thailand, female (O). Scale bar 1. 0 mm.

Figure 3. Sesieutes spp., male palp, retrolateral view (A – C, G, I – L), ventral view (D, E), dorsal view (F, H). Sesieutes bulbosus Deeleman-Reinhold, holotype (A); Sesieutes borneensis Deeleman-Reinhold, holotype (B); Sesieutes apiculatus sp. nov., holotype (C); Sesieutes lucens Simon, holotype (D); Sesieutes abruptus sp. nov., holotype (E, F); Sesieutes scrobiculatus Deeleman-Reinhold, holotype (G, H); Sesieutes aberrans sp. nov., holotype (I); Sesieutes nitens Deeleman-Reinhold, holotype (J); Sesieutes emancipatus Deeleman-Reinhold, holotype (K); Sesieutes minuatus sp. nov., holotype (L). Scale bar 0. 1 mm.

Figure 9. Sesieutes aberrans sp. nov. Holotype, male palp (A – C), prolateral view (A) ventral view (B), retrolateral view (C). Scale bar 0.1 mm.