Otacilia fansipan, Jäger & Dimitrov, 2019

Jäger, Peter & Dimitrov, Dragomir, 2019, Otacilia fansipan spec. nov., the second congener recorded from Vietnam (Arachnida: Araneae: Phrurolithidae), Zootaxa 4664 (2), pp. 233-240 : 234-235

Otacilia fansipan spec. nov.

Figs 1–14

Type material. Holotype. ♂. VIETNAM: Lao Cai Province: Fansipan Peak , 22.3056°N, 103.7762°E, 2992 m a.s.l., leg. Nikolay Simov, Rostislav Bekchiev, Ivaylo Dedov & Petar Beron, 21.IX.2018 ( NMNHS) . Paratypes. 2♀, with same data as for holotype (1♀ NMNHS, 1♀ SMF) .

Additional material examined. 1 juvenile, with same data as for holotype ( NMNHS) .

Etymology. This species is named after the type locality; name in apposition.

Diagnosis. Males of O. fansipan spec. nov. ( Figs 1–3 , 8–9, 11–12 ) are similar to those of O. hippocampa Jin, Fu, Yin & Zhang, 2016 in having a similar bulbal conformation, with a short and slightly curved needle-like embolus, a short triangular tegular apophysis situated retrolaterally, the U-shaped spermophor located mainly in distal half of the tegulum, and by the absence of a conductor, but may be distinguished by the very short RTA and well developed retrolaterad TA (long RTA with additional long DTA and only weakly developed retrolaterad TA in O. hippocampa ). Females of O. fansipan spec. nov. ( Figs 4–7 , 10, 13–14 ) are similar to those of O. hippocampa in having very small copulatory openings, situated anterior of the sclerotised spermathecae, and a narrow median septum at least in its posterior part, but may be distinguished by the copulatory openings situated more laterally, thus median septum with anteriorly diverging margins, and spherical bursae (copulatory openings closer, median septum with parallel margins and bursae sub-oval in O. hippocampa ). Both sexes of the new species can be distinguished from O. hippocampa also by the different colour pattern: prosoma dorsally with two bars lateral to a light median band, dark margin very narrow; sternum and median ventral opisthosoma dark; transversal bars partly fused (prosoma only with wide dark margin; sternum and ventral opisthosoma light; transversal bars all separated in O. hippocampa ).

Description. Male. Prosoma length 1.55, width 1.3, anterior width of prosoma 0.6, opisthosoma length 1.45, width 1.0. Eye diameters AME 0.09, ALE 0.10, PME 0.09, PLE 0.11; interdistances AME–AME 0.05, AME–ALE 0.0, PME–PME 0.08, PME–PLE 0.03, AME–PME 0.08, ALE–PLE 0.08, clypeus height at AME 0.14, at ALE 0.10. Palp and leg measurements: palp 1.85 (0.65, 0.3, 0.3, -, 0.6), I 5.65 (1.5, 0.5, 1.6, 1.35, 0.7), II 4.75 (1.25, 0.45, 1.25, 1.1, 0.7), III 4.1 (1.1, 0.45, 0.9, 1.05, 0.6), IV 5.8 (1.5, 0.5, 1.35, 1.6, 0.85); leg formula: 4123. Spination of palp and legs: palp 010, 110, 110; femora I d2, vp3(4), II d2, vp2, III d2, IV d1; tibiae I v12, II v11; metatarsi I v7, II v6. Chelicerae with 2 promarginal, 2 retromarginal teeth and two strong spines frontally. Retromargin of chelicerae with 3 distal bristles close to fang base.

Palp as in diagnosis ( Figs 1–3 , 8–9 ). RTA arising distally from tibia, short, with blunt end. Cymbium more than two times longer than tibia, with paracymbium pointed. Tegulum pear-shaped, extending prolaterally and proximally beyond cymbial margin in ventral view. Embolus arising in 11:30-o’clock-position from tegulum, retrolaterad TA pointed, tip triangular, in a right angle with embolus and distal tegulum, respectively. Distad TA short and inconspicuous, tip pointed, arising from tegulum at 1-o’clock-position. Femur with ventral hump, shallow cavity in distal half and subdistal lyriform organ.

Colouration ( Figs 11–12 ). Orange-yellow with dark pattern. Prosoma with fovea, indistinct striae, thin margin and eye region dark. Sternum dark with pale striae. Labium and gnathocoxae darker orange, with gnathocoxae light distally. Chelicerae deep orange. Legs with distal annulations on femora and tibiae, more distinct in hind legs. Opisthosoma dorsally with distinct pattern of dark transverse triangular bars in posterior half and pale orange scutum; laterally darkly serrated; ventrally with dark median band.

Female. Prosoma length 1.5, width 1.25, anterior width of prosoma 0.55, opisthosoma length 1.6, width 1.2. Eye diameters: AME 0.10, ALE 0.11, PME 0.11, PLE 0.13; interdistances AME–AME 0.02, AME–ALE 0.0, PME– PME 0.06, PME–PLE 0.02, AME–PME 0.09, ALE–PLE 0.07, clypeus height at AME 0.07, at ALE 0.08. Palp and leg measurements: palp 1.85 (0.55, 0.3, 0.4, -, 0.6), I 5.55 (1.4, 0.55, 1.7, 1.3, 0.6), II 4.65 (1.25, 0.5, 1.3, 1.0, 0.6), III 2.95 (1.1, 0.45, 0.9, 1.0, 0.6), IV 5.55 (1.5, 0.5, 1.3, 1.5, 0.75); leg formula: [41]23. Spination of palp and legs: palp 010, 110, 0000, 0000; femora I d2, vp3(4), II d2, vp2, III d2, IV d1; tibiae I v13, II v12; metatarsi I v7, II v6. Chelicerae with 2 promarginal and 2 retromarginal teeth and two strong spines frontally. Retromargin of chelicerae with 2 distal bristles close to fang base.

Copulatory organ as in diagnosis ( Figs 4–7 , 10 ). Epigynal field slightly wider than long. Lateral lobes and median septum partly fused, with 5 larger sclerotised spheres in posterior half. Bursae situated completely anterior of copulatory openings. Glandular appendages distinctly laterad. Spermathecae with internal rib-like ridges laterally, in posterior part laterally with additional, papilla-like appendages of unknown function. Fertilisation ducts bent at acute angle, tips antero-laterad.

Colouration ( Figs 13–14 ). As in male but generally paler, and opisthosoma dorsally with lateral ends of bars not touching each other.

Variation. The other female paratype with PL 1.5, OL 1.65. Generally lighter, transversal bars on dorsal opisthosoma not touching each other.

Distribution. Known only from the type locality ( Fig. 16 ).

Figures

FIGURE 16. Distribution of all records of the genus Otacilia Thorell, 1897 (described species according to World Spider Catalog 2019 and papers therein; undescribed specimens according to Deeleman-Reinhold 2001 and Jäger & Wunderlich 2012: indicated only once [Philippines], black triangles). New species described in this paper: red square.

FIGURES 1–3. Otacilia fansipan spec. nov., holotype male from Vietnam, Lao Cai Province, left palp (1 ventral, 2 retrola- teral, 3 femur, retrolateral). E—embolus, dTA—distad tegular apophysis, H—ventral humb with cavity, LO—lyriform organ, PC—paracymbium, rTA—retrolaterad tegular apophysis, RTA—retrolateral tibial apophysis, Sp—spermophor.

FIGURES 4–7. Otacilia fansipan spec. nov., female paratype from Vietnam, Lao Cai Province, copulatory organ (4–5 Epigyne, ventral; 6 Vulva, dorsal, 7 schematic course of internal duct system, dorsal). B—bursa, CO—copulatory opening, EF—epigynal field, FD—fertilisation duct, GA—glandular appendage, MS—median septum, PA—papilla-like appendage, SP—spermatheca; arrows indicate sclerotised spheres. Circle—copulatory orifice, “T”—glandular appendage and bursa, arrow—fertilization duct in direction of the uterus externus.

FIGURES 8–14. Otacilia fansipan spec. nov., holotype male (8–9, 11–12) and female paratype (10, 13–14) from Vietnam, Lao Cai Province. 8–9 left palp (8 ventral, 9 retrolateral); 10 vulva, dorsal; 11–14 habitus (11, 13 dorsal; 12, 14 ventral).