Description of four new species of armoured spiders (Araneae, Tetrablemmidae) from Sumatra, Indonesia Author Fardiansah, Riko Author Duperre, Nadine Author Widyastuti, Rahayu Author Potapov, Anton Author Stefan Scheu, Author Harms, Danilo text ZooKeys 2019 820 95 118 http://dx.doi.org/10.3897/zookeys.820.29363 journal article http://dx.doi.org/10.3897/zookeys.820.29363 1313-2970-820-95 C09FC8BA3DD34491833262F6BE9E9C5D C09FC8BA3DD34491833262F6BE9E9C5D Ablemma contrita Fardiansah & Duperre sp. n. Figs 8-11, 12-14, 15-18, 19-20, 48 Type material. Holotype ♂: Indonesia, Sumatra, Harapan, 01°49'31.9"S , 103°17'39.2"E , jungle rubber, October 2012, M. Jochum, A. Barnes (LIPI). Paratypes 1♂ and 1♀, same data as holotype ( ZMH-A 0001219). Etymology. The specific name is a noun in apposition taken from Latin, meaning broken, in reference to the tip of the embolus. Diagnosis. Males can be distinguished from all congeners with the exception of similar species ( A. unicornis Burger, 2008, A. erna , A. kaindi Lehtinen, 1981, and A. malacca by the blunt apical end of the male embolus (Figs 12, 13). Furthermore, A. contrita sp. n. differ from A. unicornis by the lack of an anterior tooth on the carapace behind the eye group (Figs 8, 11) vs. present in A. unicornis (see Burger 2008 , 254, figs 1, 2); from A. erna and A. kaindi (see Lehtinen 1981 , 128-129, figs 166, 171) by its shorter and flatter embolus, and the more elongated palpal bulb (Figs 12, 13); from A. malacca by the concave and swollen pars cephalica (Fig. 11), straight and not swollen in the latter (see Lin et al. 2017 , fig. 7). Females are distinguished from similar species as follows: from A. unicornis by the absence of the posterior pit on the sternum in females (Fig. 16); from A. kaindi by their longer inner genitalic plate; from A. erna by their wider, not expanded apically inner gentitalic plate; from A. malacca by the shorter and thicker inner gentitalic plate (Fig. 20). Figures 8-11. Ablemma contrita sp. n., male. 8 Habitus, dorsal view. 9 Habitus, ventral view. 10 Carapace, frontal view. 11 Habitus, lateral view. Scale bar: 1.0 mm. Description. Male (holotype). Measurements: Total length: 0.91; carapace length: 0.41; carapace width: 0.35; abdomen length: 0.50; abdomen width: 0.40; clypeus height: 0.16. Length of legs: I 0.88 (0.28, 0.11, 0.22, 0.12, 0.15); II 0.75 (0.24, 0.10, 0.16, 0.12, 0.13); III 0.74 (0.22, 0.10, 0.16, 0.13, 0.13); IV 0.92 (0.28, 0.12, 0.22, 0.16, 0.15). Carapace: Brownish orange, pars cephalica finely reticulated, concave and then strongly convex with one small tubercle at apical end; sides finely reticulated; pars thoracica reticulated, sloping gradually (Figs 8, 11); clypeus brownish orange; sloping forward; finely reticulated (Figs 10, 11). Sternum: Brownish orange; slightly wider than long; reticulated except along midline (Fig. 9). Chelicerae: Brown; cheliceral basal boss straight, thick; cheliceral apophysis small, triangular; lamina thin, transparent (Fig. 48). Eyes: 6 in compact group (Fig. 8). Abdomen: Dorsal scutum yellowish orange, smooth, covered with setae (Fig. 8). Laterally covered by 4 brownish orange stripe-like scuta, slightly separated (Fig. 11). Ventrally covered by 4 smooth scuta; plumonary scutum brown, with oval book-lung covers; postgenital scutum small and straight, shorter than preanal scutum; preanal scutum large, rectangular; anal scutum triangular conical, short and curved. Legs: Yellowish brown, femora I-IV rugose ventrally; tarsi I swollen. Palp: Segments yellowish white; bulb pyriform (Figs 12, 13). Sperm duct thick, narrowing gradually; embolus dark brown, apically semi-transparent and truncated; basal projection somewhat triangular (Fig. 14). Figures 12-14. Ablemma contrita sp. n., male. 12 Palp, prolateral view. 13 Palp, retrolateral view. 14 Schematic illustration of palpal bulb, retrolateral view. Scale bar: 0.1 mm. Female (paratype). Measurements: Total length: 0.88; carapace length: 0.42; carapace width: 0.33; abdomen length: 0.46; abdomen width: 0.38; clypeus height: 0.9. Length of legs: I missing; II 0.73 (0.22, 0.11, 0.16, 0.12, 0.12); III 0.66 (0.22, 0.09, 0.15, 0.09, 0.11); IV missing. Coloration: Same as in male. Carapace: Pars cephalica smooth dorsally, slightly elevated in lateral view, reticulated laterally; pars thoracica reticulated, sloping gradually (Figs 15, 18); clypeus smooth, slightly convex (Figs 17, 18). Chelicerae: Brownish orange, not modified. Eyes: 6 in compact group, not protruding (Figs 15, 17). Legs: Coloration as in male; most legs missing. Abdomen: Dorsal and lateral scuta as in male (Figs 15, 18). Ventrally with 4 smooth scuta; pulmonary scutum with oval book-lung covers; postgenital scutum small and straight, shorter than preanal scutum; preanal scutum large, rectangular, with 2 posterolateral corners and small posteromedial corner; anal scutum triangular conical, short and curved (Fig. 19). Genitalia: Inner plate short and thick, distal end slightly rounded and wide; lateral horns and ducts not observed; seminal receptacle not observed (Fig. 20). Natural history. Specimens were only collected in lowland rainforest with rubber trees. Distribution. Known only from the type locality, Harapan, Sumatra. Figures 15-18. Ablemma contrita sp. n., female. 15 Habitus, dorsal view. 16 Habitus, ventral view. 17 Carapace, frontal view. 18 Habitus, lateral view. Scale bar: 1.0 mm.