3D reconstruction, head of P. heisei, tentorium. (A) dorsal view; (B) ventral view, flattened hyalinous setae removed, (A–B) upper half with intransparent cuticle, lower half with transparent cuticle; (C) dorsal view, uppermost part of frontal pouch cut off, cuticle intransparent on left side, transparent on right side; (D) sagittal view, upper half with cuticle intransparent, lower half with transparent cuticle. Abbreviations: dat, dorsal attachment of tentorium; fp, frontal pouch; ptp, posterior tentorial pouch; t, tentorium; vat, ventral attachment of the tentorium.