Original description of Tibia (Amplogladius) youssefi by Abbass, 1967:
- "Specimen large, fusiform internal moId: spire conical consisting of 3 flat or slightly convex whorls; earlier whorl missing; sutures linear, furrowed; body whorl slightly exceeds spire in height, posterior 1/3 rd flatly inclined outwards then curves at rounded edge and contracts anteriorly as short conical beak; ornament not preserved; aperture outline fusiform, inflated medially, angular posteriorly, narrowly elongated anteriorly into short canal; outer lip convex; inner lip convex posteriorly, concave anteriorly."
Locus typicus: Mokattam Hills, Gioushy, Egypt
Stratum typicum: middle Eocene
Dimensions: Spire angle 50°, height 66 mm, width 38 mm, whorl height 12 mm, whorl width 27 mm