Exocora

Lemos, Yuji & Brescovit, Antonio D., 2013, New species of the spider genus Exocora Millidge, 1991 (Araneae: Linyphiidae) from Brazil, Zootaxa 3599 (3), pp. 261-278 : 274-275

Exocora una new species

Figs. 13 A–D; 14A–F; 15F; 16F; 17

Type: Holotype 1ɗ, from Reserva Biológica de Una (15°08'34"S; 39°9'22"W), Una, Bahia, Brazil, 14/IV/1999, A. D. Brescovit et al. col. ( IBSP 18069). Paratype: 1Ψ, from Reserva Biológica de Una (15°08'34"S; 39°9'22"W), Una, Bahia, Brazil, 14/IV/1998, A. D. Brescovit et al. col. ( IBSP 18059), 1ɗ3Ψ, 15–28/XI/2008, A.D. Brescovit et al. col. ( IBSP 47600, 47601, 47604); 1ɗ, from Campus of Michelin (13°43'S; 39°08'W), Ituberá, Bahia, Brazil, 15–25/I/2009, C. Leite col. ( IBSP 143763).

Etymology: The species epithet is a name in apposition taken from the type locality.

Diagnosis: Specimens of Exocora una n. sp. resemble those of E. medonho n. sp. and E. nogueirai n. sp. in the shape of the male palp and the epigynum. It differs from E. nogueirai n. sp. e E. medonho n. sp. by the size of the embolic membrane, very short in E. una n. sp. ( Figs 13 A, B), and by the shape of the dorsal plate and the atrium in the epigynum, much smaller in E. una n. sp. ( Figs 13 C, D; 15F; 16F).

Description: Male (Holotype IBSP 18069): Total length 1.36. Carapace 0.66 long, 0.56 wide, yellowish, with small lateral dark markings. Sternum 0.34 long, 0.4 wide, yellowish, with dark margin, shows a dark spot in the center. Clypeus 0.06 high. Chelicerae promargin with 2 teeth, retromargin with 3 teeth. Abdomen pale brown, with some dark markings, mainly near the spinnerets, and white spots on the abdomen ( Figs 14 A, B). Eyes diameter and interdistances: AME 0.06, ALE 0.08, PME 0.07, PLE 0.08, AME-AME 0.01, PME-PME 0.04, AME-ALE 0.01, PME-PLE 0.02. Eyes projected above the clypeus, ocular area with bristles ( Fig. 14 B). Coxa IV separation 1.4 times their width. Femur I/II/III/IV 0.8/0.76/0.52/0.66; patella I 0.22; tibia I 0.76; metatarsus I 0.76; tarsus I 0.48. Legs yellowish, with dark markings in each article. Tibia I has a thick prolateral macroseta ( Fig. 14 C). TmI 0.18. Palpal tibia without apophysis. Protegulum present, small. Embolus long, originates in the posterior part of the embolic division, runs to the ectal side and oriented anteriorly, getting into the lamella characteristica. Embolic membrane short, projects anteriorly ( Figs 13 A, B).

Female (Paratype IBSP 47601): Total length 1.9. Carapace 0.72 long, 0.6 wide. Sternum 0.4 long, 0.42 wide. Clypeus 0.08 high. Chelicerae promargin with 3 teeth, retromargin with 5 teeth. Color pattern as in male. Female has a dark spot on the carapace covering the dorsal part and abdomen with white spots in the dorsal side ( Figs 14 D, E). Eyes diameter and interdistances: AME 0.07, ALE 0.08, PME 0.08, PLE 0.08, AME-AME 0.01, PME-PME 0.05, AME-ALE 0.02, PME-PLE 0.02. Eyes pattern as in male, ocular area with poor bristles ( Fig. 14 E). Coxa IV separation 1.5 times their width. Leg formula I-II-IV-III. Femur I/II/III/IV 0.82/0.8/0.62/0.78; patella I 0.24; tibia I 0.76; metatarsus I 0.78; tarsus I 0.48. Legs as in male. Tibia I prolateral macroseta less developed ( Fig. 14 F). TmI 0.18. Dorsal tibial macrosetae 2-2-2-2. TmIV absent. Epigynum prominent, with a single atrium ( Figs 13 C; 15F). Spermathecae rounded. Copulatory duct originating from the posterior part of spermatheca, presents only one turning in the ventral direction. Copulatory openings in the mesal part. Fertilization duct originating from the posterior side of the spermatheca is oriented mesally ( Figs 13 D; 16F).

Variation: Males (n=3): Total length 1.38–1.38; carapace length 0.62–0.68; carapace width 0.52–0.58; femur I length 0.76–0.78. Females (n=10): Total length 1.48–1.86; carapace length 0.64–0.76; carapace width 0.52–0.64; femur I length 0.7–0.88.

Distribution: Known only for Ituberá e Una, Bahia, Brasil ( Fig. 17 ).

Material examined (N=19): BRAZIL, Bahia: Una, Reserva Biológica de Una (15°08'34"S; 39°9'22"W), 2ɗ17Ψ, 15-28/XI/2008, A. D. Brescovit et al. col. ( IBSP 18069; IBSP 18150; 18197, 18333, 18386, 47599, 47602–47603, 47605–47609).

Figures

FIGURE 13. Exocora una n. sp., male palp (A, B), epigynum (C, D): A, retrolateral; B, prolateral; C, ventral; D, dorsal. Scale bars 0.1 mm.

FIGURE 14. Exocora una n. sp., male habitus (A, B), male tibia I macroseta (C), female habitus (D, E), female tibia I macroseta (F). A, D, dorsal; B, E, lateral; C, F, dorsal. Scales bars 0.5 mm in C and F; 1.0 mm in other images.

FIGURE 17. Distribution of the Exocora species described in this paper.