Trilacuna hamata Tong & Li, 2013, sp. nov.
Creators: name: Tong, Yanfeng
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Oonopidae
Trilacuna
Trilacuna hamata

description: Trilacuna hamata sp. nov.
(Figs 1–3, 4A–D)
Type material. 1 male holotype (IZCAS Ar 19419), Tam Dao National Park, Vinh Phuc, Vietnam, pitfall traps, in natural forest, Pham Dinh-Sac, 1–30. XI. 2007; 1 female paratype (IZCAS Ar 19420), same data as holotype.
Etymology. The specific name is Latin, meaning “hook-shaped” and refers to the shape of the strongly curved outgrowth of the male embolus (Figs 2 A–H); adjective.
Diagnosis. The new species is similar to T. loebli Grismado & Piacentini, but can be distinguished from it by the smooth sternum (Fig. 3 D), the fold on the anterior margin of the postepigastric scutum in females (Figs 4A, C) and the nearly rectangular, sponge-like sclerite (rss) in the female genitalia (Figs 4B, D).
Description. Male. Completely chitinized. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Figs 1 A, B. Body length 1.72; carapace 0.81 length, 0.65 width; abdomen 0.85 length, 0.53 width. Carapace broadly oval, slightly elevated, dorsal surface smooth, with three rows of short hairs between eyes and posterior border of dorsal elevation of carapace; sides granulated; lateral margin rebordered, with a row of short, finely hairs and small blunt denticles. Eyes six, well developed, arranged in a compact group, about subequal, roundish (Figs 1 C, D); posterior row recurved from above, straight from front (Figs 1 C, F). Clypeus sinuous in frontal view, anterior lateral eyes separated from edge of carapace by about 1.5 times their diameter, with needlelike setae. Mouthparts: Chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, not fused to sternum, anterior margin deeply incised (ldi) (Fig. 1 I); endites slender, distally only slightly branched (sdb) (Fig. 1 I). Sternum surface smooth with small pits on radial furrows between coxae, anterior margin with transverse groove; setae sparse, light, needle-like, evenly scattered (Fig. 1 E). Abdomen: Ovoid, dorsal scutum not fused to epigastric scutum, postepigastric and epigastric scutum fused, apodemes absent, posterior spiracles not connected by groove (Figs 1 G, H), booklung covers (boc) large, ovoid, surface smooth. Leg spines: metatarsi I, II with 4 pairs of ventral spines each, tarsi I, II with 2 pairs of ventral spines each; legs III and IV without spines.
Male genitalia: Epigastric region (Fig. 1 G) with sperm pore small, oval, rebordered, situated between anterior and posterior spiracles. Palp (Figs 2 A–H): pale-orange. Femur slightly enlarged (Figs 2 A, B), attached to patella basally. Cymbium not fused with bulb, with scattered setae. Bulb pear shaped, about twice as long as cymbium, stout, tapering apically. Embolus system (Figs 2 C–H) complicated, with two slightly sclerotized, strongly curved outgrowth (sso), retrolateral-dorsally bordered by numerous hairs (rdh); with a filiform, long and mesially curved projection (ffp), framed by some dorsal hairs (dh) and a narrow branch (nb); base of the embolus system with a long, membranous lobe (mlo).
Female: As in male except as noted. Slightly larger than male. Body length 1.85; carapace 0.83 length, 0.65 width; abdomen 0.99 length, 0.61 width. Postepigastric scutum long, semicircular, not fused to epigastric scutum. Posterior spiracles connected by groove; with two strongly sclerotized, recurved arches (sar) anterior to the posterior spiracles (Figs 4A, C).
Female genitalia: Ventral view (Figs 4A, C): Posterior margin of epigastric scutum with two dark brown knobs (dkn); anterior margin of postepigastric scutum with a fold (fo); surface without external features except for a rugose surface around the epigastric furrow. Dorsal view (Figs 4B, D): with a nearly rectangular, sponge-like sclerite (rss), covered by a narrow, stick-like sclerite (sls), extending anteriorly, with very short apodemes (apo).
description: Published as part of Tong, Yanfeng & Li, Shuqiang, 2013, The first goblin spiders of the genus Trilacuna from Vietnam (Araneae, Oonopidae), pp. 277-284 in Zootaxa 3709 (3) on page 278, DOI: 10.11646/zootaxa.3709.3.6, http://zenodo.org/record/217457