Sadala nigristernis Simon, 1880 comb. rest.

Figs 38–40, 43–44, 90

Sadala nigristernis Simon, 1880: 322 (female holotype from São Paulo de Olivença [‑3.3667, ‑68.8667], Amazonas, Brazil, MNHN 1672).

Sparassus nigristernis: Simon 1897: 35 .

Olios nigristernis: Simon 1903a; 1020; Petrunkevitch 1911: 501; Jäger 2020: 81 (misplaced in Olios).

Additional material examined. BRAZIL: Pará: 3♀, Tucuruí [‑3.8167, ‑49.6333], Usina Hidrelétrica de Tucuruí, Rio Tocantins, no date, Equipe Butantan leg. (IBSP 6893) ; 1♀, same locality as previous specimen, July 1984, Equipe Butantan leg. (IBSP 5642); 1♀, same locality as previous specimen, 1984 (IBSP 5977); Rondônia: 3♀, Usina Hidrelétrica de Samuel [‑8.7500, ‑63.4500], December 1988, Equipe Butantan leg. (IBSP 6616, 6617, 6622) ; Acre: 1♀, Parque Nacional da Serra do Divisor, Pedernal [‑8.0337, ‑73.5500], 13 November 1996, R. S. Vieira leg. (IBSP 9144) ; 1♀, Manoel Urbano, Parque Estadual do Chandless (‑9.4081, ‑69.9292), 23–25 November 2010, W.E.F. Morato leg. (‑exUFMG 6180) ; 1♀, Senador Guiomard, Reserva Extrativista de Catuaba [‑10.0667, ‑67.6167], 2000–2002, E. Morato leg. (IBSP 87532) ; Mato Grosso: 1♀, Cláudia [‑11.5000, ‑54.8833], Fazenda Iracema, 2–17 April 1997, M. Caleffo leg. (IBSP 10226) .

Diagnosis. Females of S. nigristernis resemble those of S. velox (Figs 75–77) by the epigyne with MS roughly trapezoid, widest medio-anteriorly (Fig. 38). They are distinguished from those of the latter species by the MS two times longer than wide and margins of CO oblique (Fig. 38) (MS as long as wide and margins of CO roughly longitudinal in S. velox). Males are unknown.

Redescription. Female (holotype): Total length 19.4. Prosoma: 7.9 long, 7.3 wide. Opisthosoma: 10.8 long, 3.7 wide. Eyes: diameters: 0.58, 0.44, 0.30, 0.45; interdistances: 0.48, 0.20, 0.74, 0.70, 0.48, 0.32. Legs: I: 32.9 (9.2, 3.7, 8.7, 9.0, 2.3); II: 34.6 (10.1, 3.8, 9.1, 9.4, 2.2); III: 25.7 (8.0, 3.3, 6.4, 6.1, 1.9); IV: 28.4 (8.7, 3.0, 7.0, 7.6, 2.1). Spination follows the generic pattern. Epigyne: EF longer than wide; MAB embedded in EF; TP two times longer than wide; LL touching posteriorly (Figs 38, 43). Vulva: FW antero-mediad; GP cylindrical, slightly longer than wide, arising from ducts at second turn; SP irregularly rounded; FD antero laterad (Figs 39–40, 44).

Male: Unknown.

Variation. Females (n = 9): total length 16.0–23.7; prosoma length 7.2–8.2; femur I length 8.3–10.0.

Distribution. Known from northern and central Brazil, states of Amazonas, Acre, Rondônia, Pará and Mato Grosso (Fig. 90).