Original description of Rimella adekunbiana by Adegoke, 1977:
- "Shell medium-sized, thin-walled, biconic. Spire high, consisting of about eight or nine gently convex, uniformly tapering whorls which are about twice as wide as high. Protoconch small and rounded. Body whorl high, cylindrical, constituting about three-fifth height of shell, slightly angulated near the adapical margin. Aperture narrow, elongate oval. Columella stout, conical, not completely preserved, with heavy callus covering the parietal area. Posterior canal narrow, describing a strongly sinuous pattern on the upper body whorl and penultimate whorl. Thin callus deposit lines the floor of the posterior canal. Exterior of the shell smooth with a glossy finish, marked only by faint growth striae."
Locus typicus: Ewekoro Quarry, 55 km northwest of Lagos, Lagos State, Nigeria
Stratum typicum: Ewekoro Formation, Paleocene