Sesieutes minuatus Dankittipakul &amp; Deeleman-Reinhold, 2013, sp. nov.
Creators: name: Dankittipakul
name: Deeleman-Reinhold
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Liocranidae
Sesieutes
Sesieutes minuatus

description: <i>Sesieutes minuatus</i> sp. nov. (Figures 1 C,D, 2 C, 3 L, 5 A–F) <i>Type material</i> <i>Holotype.</i> &amp;male;, Thailand, Chanta Buri Province, Nam Tok Plieu Khao Sabap National Park, 100 m semi-evergreen rainforest, 27–28 August 1992, leg. P.J. Schwendinger (MHNG, 1274). <i>Paratypes.</i> One &amp;female;, data as holotype (MHNG, 1274). 1&amp;male;, 2&amp;female;, Nam Tok Plieu Khao Sabap National Park, 50–100 m semi-evergreen rainforest, 12–13 November 1998, leg. P.J. Schwendinger (MHNG, 1158). 2&amp;female;, Trat Province, Ko Chang, west side, 200 m, 3–23 December 1999, secondary forest with primary spots, Winkler extraction, leg. A. Schulz (MHNG, AS–T–5). 2&amp;male;, 1&amp;female;, Nakhon Ratchasima Province, Khao Yai National Park, Khao Khiew, evergreen hill forest, 1150 m, 29 October 1997, leg. P.J. Schwendinger (MHNG, 7). <i>Diagnosis</i> Males of <i>S. minuatus</i> sp. nov. are recognized by the presence of a rectangular projection on the apex of the proximal RTA (Figures 3 L, 5 A,C), in combination with the medially situated conductor. Males are distinguished from their congeners by the minute distal RTA (Figures 3 L, 5 C). Females can be distinguished from those of the closely related <i>S. emancipatus</i> sp. nov. by the longer grooves on the epigynal region (Figures 5 D cf. 10 E), the more elongated and strongly arched proximal ducts in dorsal view (Figure 5E). <i>Etymology</i> The specific epithet is a Latinized adjective referring to a small, sharply pointed distal RTA of the male palp. <i>Description</i> <i>Male</i> (holotype). Total length 5.20; prosoma 2.60 long, 1.82 wide; opisthosoma 2.86 long, 1.62 wide. Leg measurements: leg I 7.14 (1.94, 2.60, 1.48, 1.10); II 6.10 (1.62, 2.20, 1.30, 0.98); III 5.16 (1.48, 1.46, 1.30, 0.90); IV 7.92 (2.08, 2.48, 2.20, 1.16). Leg spination. Leg I: Fe p–1, Ti v–2–2 –2–2–2–2–2, Mt v–2–2 –2–2; leg II: Ti v–2–2 –2–2– 2–2, Mt v–2–2 –2–2; leg III: Ti p–1–1 v–1–1 –1–1 r–1, Mt p–1 v–1–1 –1 r–1; leg IV: Fe d–1, Ti p–1–1 v–1–1 –1 r–1, Mt p–1, v–1–1, r–1–1. <i>Pattern and coloration</i> (Figure 1 C). Carapace dark reddish brown, sparsely clothed with white pubescence; integument granulated, nodules minute, evenly distributed, few or less on pars cephalica; chelicerae, labium and gnathocoxae dark reddish brown; sternum brown; legs bicolored, coxae to femora orange-brown, patellae to tarsi yellow, white annulation present on distal half of anterior tibiae. Opisthosoma elongateovoid; venter pale, with two longitudinal rows of heavily sclerotized, circular spots; epigastric scutum dark reddish brown, heavily sclerotized, protruding anteriorly, forming grooved collar; dorsal scutum heavily sclerotized, reddish brown, occupying entire length of opisthosoma, sparsely covered with white pubescence. <i>Palp</i> (Figures 3 L, 5 A–C). Palpal tibia with digitiform prolateral excrescence; proximal RTA with membranous anterior surface, posterior surface heavily sclerotized, apex provided with semi-transparent, quadrangular projection; distal RTA minute, sharply pointed; tegulum strongly excavated apico-prolaterally, with distinctly elevated anterior portion; conductor lanceolated, originating medially, sides paralleled in ventral view; tegular apophysis originating posterior to base of conductor. <i>Female</i> (paratype, MHNG). Total length 6.16; prosoma 3.08 long, 2.16 wide; opisthosoma 3.50 long, 1.92 wide. Leg measurements: leg I 8.46 (2.30, 3.08, 1.78, 1.30); II 7.23 (1.92, 2.60, 1.54,1.16); III 6.12 (1.78, 1.74, 1.54, 1.08); IV 9.38 (2.46, 2.90, 2.60, 1.30). Leg spination. Leg I: Fe p–1, Ti v–2–2 –2–2–2–2–2, Mt pv–1 v–2–2 –2–2; leg II: Ti v–2–2 –2–2–2, Mt v–2–2 –2–2; leg III: Ti p–1–1 v–1–2 –1 r–1, Mt p–1 v–1–2 r–1; leg IV: Fe d–1, Ti p–1–1 v–1–1 –2 r–1, Mt p–1, v–2–1, r–1. <i>Pattern and coloration</i> (Figure 1D). Carapace dark reddish brown, clothed with short, white pubescence; integument coarsely granulated, unevenly distributed on carapace, more on peripheral margin; chelicerae, labium and gnathocoxae brown; sternum dark brown; legs orange-brown except anterior femora and tibiae brown; green annulation present on distal half of anterior tibiae. Opisthosoma ovoid; dorsum dark grey, posteriorly with series of pale chevrons; venter pale, without pattern; dorsal scutum heavily sclerotized, ovoid, orange-brown, occupying four-fifths length of opisthosoma; epigastric scutum heavily sclerotized, protruding anteriorly, forming ring collar. <i>Genitalia</i> (Figures 5D–F). Epigastric scutum with pair of semi-circular copulatory orifices connected to narrowed, longitudinal grooves; proximal ducts broad, strongly arched; insemination ducts intertwined, forming five or six coils in mid-longitudinal axis; spermathecae elliptical, with large, circular gland pores situated anteriorly. <i>Natural history</i> Males of this new species clearly mimic ants. Their opisthosoma is entirely encapsulated with an elongate-ovoid dorsal scutum, which is clothed with white hairs and underlying dark greyish dorsal pattern. Together with a stalk-like pedicel, they give an appearance of a segmented abdomen of the ants. The presence of rows of short, straight bristles on dorsal and ventral surface of leg segments also give an impression of the setae in ants. <i>Distribution</i> Eastern Thailand.
description: Published as part of <i>Dankittipakul &amp; Deeleman-Reinhold, 2013, Delimitation of the spider genus Sesieutes Simon, 1897, with descriptions of five new species from South East Asia (Araneae: Corinnidae), pp. 167-195 in Journal of Natural History 47 (3)</i> on pages 180-182, DOI: 10.1080/00222933.2012.742165, http://zenodo.org/record/583948