Synopsis of the Asian species in the genus Zarcosia Collado & Alonso-Zarazaga 1996 with new combinations and descriptions of fourteen new species Author Gompel, Nicolas text Zootaxa 2020 2020-08-26 4838 2 151 178 journal article 8744 10.11646/zootaxa.4838.2.1 761fcec7-c79d-4e80-bb2b-23cc9e78e0b6 1175-5326 4403783 0AD43D95-7508-466C-980F-CBEF38CA1198 Zarcosia sumatrensis n. sp. ( Figures 1 ; 3g ,h ; 4p ; 5o ; 6f ) Etymology. The species’ name refers to its geographical origin. Type locality. Republic of Indonesia : Sumatra , Goea Limau Moangkaer [ 04°14’ N 98°10’ E ] . Distribution. Republic of Indonesia : Sumatra ( Figure 1 ). Description. ( Figure 3g ,h ). Body length. ♂ holotype : 3.00 mm; ♀ : 2.65± 0.19 mm (n=7). Dark brown, darker anteriorly, gracile, covered with very short, pulverulent pubescence. Appendages orange-brown. Head . Small, dark, barely wider than pronotum. Palpi orange, last article securiform. Integument, finely and densely punctuated, lightly rugose. Occiput lined with a very fine fringe of dense and short silver hairs posteriorly. Antennae . A third longer than elytra in ♂ , as long as elytra in ♀ , orange-brown, regularly filiform with antenommeres 3–10 cylindrical. Pronotum ( Figure 6f ). Round and convex, slightly elongated in ♂ , as long as wide in ♀ . Sides regularly curved. Surface mat, finely and densely punctuated, covered with dense, pruinose double pubescence. Elytra . Length: ♂ holotype : 2.00 mm; ♀ : 1.95± 0.10 mm (n=7). Punctation fine and shallow, dense (space between points as wide as the points themselves). Disc depressed. Pubescence dense and short, whitish, comprised of short hairs borne from the points and interspersed pulverulent hairs. Legs . Particularly elongated. Foretibia thickened in a smooth tooth on their inner side ( Figure 5o ). Mesothoracic legs not observed (a single male devoid of mesothoracic legs was present in the type series). Aedeagus ( Figure 4p ). Sides subparallel in dorsal view, apex tapered in apical fifth, ending with a button. Strongly bent in lateral view, apex with a weak upward deflection. Appendages visible near apex. Type material. Holotype ( ♂ , BMNH ). Republic of Indonesia : Sumatra , Goea Limau Moangkaer , 04°14’ N 98°10’ E ( J. C. van der Meer Mohr ) 20.III.1932 . Paratypes . Republic of Indonesia : Sumatra , Goea Limau Moangkaer , 04°14’ N 98°10’ E ( J. C. van der Meer Mohr ) 20.III.1932 ( 2 ♀ paratypes , BMNH ) ; Sumatra , Goea Lau Rakit I , 02°20’ N 98°40’ E ( J. C. van der Meer Mohr ) 5.X.1934 ( 6 ♀ paratypes , BMNH ; 2 ♀ paratypes , NGPC ) . Note . The extremely thin and elongated appendages of species likely represent adaptations to life in caves.