Segestrioides badia (Simon) Brescovit & Rheims, 2005

Brescovit, Antonio D. & Rheims, Cristina A., 2005, Pertica Simon 1903, a junior synonym of Segestrioides Keyserling, 1883 (Araneae, Diguetidae), Zootaxa 1016 (1), pp. 49-55 : 51-55

Segestrioides badia (Simon) comb. n.

( Figs. 1–12 )

Pertica badia Simon 1903: 24 (Probably immature female holotype from Colonia Alpina, Serra dos Orgãos , Rio de Janeiro [not São Paulo as in Simon’s label, see Paynter & Traylor Jr. (1991)], Brazil, deposited in the Muséum National d’Histoire Naturelle, Paris, number 19225, examined, epigynum detached and lost); Brignoli 1974: 256, figs. 1, 5; Platnick 1989: 2–4; Brescovit et al. 2002: 332; Platnick 2005.

Other material examined. BRAZIL. Rio de Janeiro: Nova Friburgo, Amparo, 1 male, 20.XII.1993, A.B. Kury leg. ( MNRJ); Teresópolis, Parque Nacional da Serra dos Órgãos, 2 females, 18–22.VIII.2001, Equipe Biota leg ( IBSP 50823 , 50824 ) .

Diagnosis. Segestrioides badia is easily distinguished from its Peruvian and Chilean congeners by the less hirsute body ( Fig. 1 ), male palp with pear­shaped tegulum ( Figs. 2– 3 ) and female epigynum with small bursa copulatrix and elongated anterolateral sclerotized plates, with basal area enlarged and rounded ( Fig. 4 ).

Description. Male ( MNRJ). Carapace, sternum and chelicerae orange. Eye borders black. Labium and endites orange with white apex. Legs and pedipalps orange, except for articulations and coxae yellow. Abdomen completely greenish­gray, with transverse white bands on posterior third and cream colored spinnerets ( Fig. 1 ). Total length 3.40. Carapace 1.60 long, 1.10 wide, very slightly hirsute, thoracic groove curved, strongly depressed, with six lateral thoracic furrows. Clypeus 0.22 high. Eye diameters: AME absent, PME 0.14, ALE 0.12, PLE 0.12. Chelicerae soldered together at base by a conspicuous white membrane ( Fig. 5 ), with a translucent hyaline keel, a ventral gland mount with great number of pores ( Fig. 6 ) and conspicuous prolateral stridulatory ridges ( Fig. 7 ). Leg measurements: I: femur 1.60/ patella 0.50/ tibia 1.30/ metatarsus 1.10/ tarsus 0.70/ total 5.20; II: 1.40/ 0.40/ 1.10/ 1.00/ 0.60/ 4.60; III: 1.00/ 0.40/ 0.70/ 0.80/ 0.60/ 3.50; IV: 1.60/ 0.50/ 1.20/ 1.10/ 0.50/ 4.90. Tarsi I unbent, not pseudosegmented. Male palp with cymbium slightly excavated distally ( Fig. 2 ), pear­shaped tegulum and wide, flattened, laminate embolus, without sclerites ( Figs. 2–3 ). Male gonopore on distinct protuberance. Abdomen hirsute, but much less than in Chilean and Peruvian species.

Female ( IBSP 50823). Coloration pattern as in male. Total length 4.10. Carapace 2.00 long, 1.40 wide, thoracic groove and thoracic furrows inconspicuous. Clypeus 0.30 high. Eye diameters: AME absent, PME 0.14, ALE 0.12, PLE 0.12. Chelicerae as in male. Leg measurements: I: femur 1.50/ patella 0.50/ tibia 1.20/ metatarsus 1.00/ tarsus 0.70/ total 4.90; II: 1.50/ 0.50/ 1.10/ 0.90/ 0.70/ 4.70; III: 1.10/ 0.50/ 0.90/ 0.70/ 0.60/ 3.80; IV: 1.60/ 0.60/ 1.10/ 1.10/ 0.60/ 5.00. Trichobothria on metatarsi with elevated, smooth and rounded base ( Fig. 8 ). Tarsus I with prolateral row of depressed glands, with oval median opening ( Fig. 9 ) and dorsal row of slightly projected, oval sensilla, with slit openings ( Fig. 10 ). Palpal femur with stridulatory pick short and stout, on rounded and projected socket ( Fig. 11 ) and tarsus without claw, ending in acuminate pit ( Fig. 12 ). Epigynum externally with semicircular sclerotizations, internally with small semicircular bursa copulatrix bearing pair of elongated anterolateral sclerotized plates ( Fig. 4 ). Abdomen as in male.

Natural History. The specimens were collected on the ground, manually or with pitfall traps, in Atlantic Forest areas. The Serra dos Orgãos is located 1000m above sea level and is classified as “humid mountain tropical forest” ( Fernandes 1998; Barros 2000). The juvenile holotype was collected in an area ranging between 1000m and 1200m above sea level. Both areas are characterized by average temperatures of 17.8ºC at 1000m above sea level. This distribution suggests that this species is restricted to high montane areas of southeastern Brazil.

Distribution. Known from montane areas of the state of Rio de Janeiro, Brazil.

Figures

FIGURE 1. Segestrioides badia (Simon). 1. male body, dorsal view. Scale bar: 1 mm.

FIGURES 2–4. Segestrioides badia (Simon). 2–3. Male left palp. (2. prolateral view; 3. retrolateral view); 4. Female, vulva, dorsal view. Scale bars: 0.5 mm.

FIGURES 5–8. Segestrioides badia (Simon). Female. 5. chelicerae, white membrane, frontal view; 6. chelicerae, ventral gland mount; 7. chelicerae, stridulatory ridges, prolateral view; 8. metatarsus I, trichobothrium, dorsal view.

FIGURES 9–12. Segestrioides badia (Simon). Female. 9. tarsi I, depressed gland, dorsal view; 10. tarsi I, oval sensilla, dorsal view; 11. palpal femur, stridulatory pick, dorsal view; 12. tarsus of pedipalp, apex, lateral view.