The shell forms a rather broad cone. The whorls are convex and evenly rounded. The height of the last whorl and the breadth are about equal and form seventy percent of the total length. The mouth occupies forty-five percent of the length. The embryonic whorls are characterized by d = 90 µm and D = 170 µm. The surface is shiny but the colour has faded from the specimens available. According to Thiele the central tooth of the radula does not show any basal denticles. The dimensions are about 2.4 - 2.7 mm. at four to five whorls.
Holotype: 2.6 x 1.9 mm.
Type locality: Bayonne, France, 2-10 m.

Although the shells of A. glaubrechti in ZMB were labelled Assiminea eliae they do not at all correspond with the original description of that species, nor with the figure given [see under Assiminea eliae Paladilhe, 1875]. It is clear that these six specimens belong to a new species which differs from Assiminea grayana, Assiminea gittenbergeri and Assiminea avilai by the convex whorls as well as the relatively broad shell. Thiele (1927:118) compares the radula with that of Assiminea grayana and writes "..die Platten sind nicht so gross und dichtgedrangt, der Mittelplatte fehlen die Hinterzacken, ihre Schneide hat ebenso wie die Zwischenplatte 7, die innere Seitenplatte 8 und die aussere 14 Zahne".