Ischnothyreus tectorius sp. n., female. A, C, E habitus, dorsal, lateral and ventral views B, D, F prosoma, dorsal, lateral and ventral views G, H, J epigastric region, ventral view I, K epigastric region, dorsal view (H, I cleared in lactic acid). Abbreviations: a = apodeme; pls = plate-like sclerite; tsa = triangular-shaped atrium; wt = winding tube. Scale bars: A, C, E =0.4 mm; B, D, F = 0.2 mm; G–K = 0.1 mm.