Otacilia truncata, Dankittipakul & Singtripop, 2014

Dankittipakul, Pakawin & Singtripop, Tippawan, 2014, New species and new records of the spider genus Otacilia Thorell, 1897 (Araneae, Corinnidae) from Southeast Asia, Revue suisse de Zoologie 121 (3), pp. 383-394 : 384

Otacilia truncata sp. n. Figs 1-16

HOLOTYPE: 3; Thailand, Chiang Mai Province and District, Doi Suthep-Pui National Park , 1180 m; pitfall traps 28.IV.-30.V.1986; leg. P.J. Schwendinger (MHNG).

PARATYPES: 3♀, 33; same data as for holotype (MHNG) .

DIAGNOSIS: The male of O. truncata sp. n. can be distinguished from its congeners by the thick and sinuous retrolateral palpal tibial apophysis (Figs 1, 4, 7, 9-10, 12), by the dorsal tibial apophysis gradually tapering then abruptly becoming a threadlike filament at its half length (Figs 2-4, 11), and by the sigmoid membranous conductor (Fig. 1). The female can be recognized by the elongated V-shaped copulatory ducts (Figs 5-6, 13) connected to posteriorly located spermathecae (Figs 6, 13).

RELATIONSHIP: Males of this new species resemble those of O. onoi Deeleman- Reinhold, 2001 (RMNH, examined) in having a large, apical conductor and a curved embolus, but differ in having a palpal tibial apophysis of different shape. Females closely resemble those of O. armatissima Thorell, 1897 (MSNG, examined) in having elongated, V-shaped copulatory ducts, but in O. armatissima the epigynal region is Otacilia truncata sp. n., male holotype (1-4), female paratype (5-6). (1) Male palp, ventral view. (2) Same, retrolateral view. (3) Same, prolateral view. (4) Same, dorsal view. (5) Epigyne, ventral view. (6) Internal genitalia, dorsal view. Abbreviations: A, epigynal atrium; B, membranous anterior bursa; C, conductor; CO, copulatory orifice; D, epigynal depression; DTA, dorsal tibial apophysis; E, embolus; FD, fertilization duct; FR, ventral femoral ridge; RTA, retrolateral tibial apophysis; S, spermatheca; SD, sperm duct; T, tegulum. Scale lines = 0.1 mm.