Punctations numerous, fine, sometimes a little coarser medianly and laterally, shallow rugae frequently present posteriorly. Cervical grooves well defined but short. Emargination moderate. Scapulae blunt.
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The length of the shell attains 30 mm. The turreted shell is pinkish white, rather thin, smooth and shining. The spire is decollated. There are nine normal whorls remaining, planate above, appressed above the sutures and medianly concave, with here and there obsolete irregular longitudinal ribs.
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Margins of branchial cavity wavy with 5 valves. Oral tentacles digitiform. General body colour orange-red, a short longitudinal band of dull yellow medianly between the rhinophores, and there is another, but transverse, band of the same colour a short distance in front of the branchiae. No labial plates.
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Life restoration of D. menneri Like the other chasmataspidids, D. menneri was a small arthropod. The biggest specimen, PIN 5116/1, reached a total length of 2.64 centimetres (1.04 inches). This size is, however, notable among diploaspidids. The prosoma (head) was subquadrate (almost square) to parabolic (nearly U-shaped), with a carapace (dorsal plate of the prosoma) rather vaulted and somewhat rounded anteriorly and laterally and flat medianly and posteriorly.
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Basis dorsally 0.60- 0.68 mm in width, the lateral submarginal fields swollen and frequently delimited from the depressed, median field by ill-defined carinae; posterior margin sinuous, posterolateral angles swollen, sometimes mildly salient; porose areas large, deep subcircular or oval, the longer axis directed anteriorly, interval frequently depressed, at most about the width of one; basis ventrally with posterior margin rounded and with well-defined, blunt, retrograde auriculae. Palps long and slender, some long hairs ventrally; article I rounded and somewhat salient laterally, inner 'ring' with dorsal tongue-like prolongation and ventrally semicircular and plate-like, the posterior margin of the plate extending beyond the palp; articles 2 and 3 with no apparent suture, 0.75- 0.85 mm in length and about four times as long as wide, narrowly rounded distally. Hypostome lanceolate and bluntly pointed; dentition mainly 3/3, the innermost file of small, spaced teeth, basally 2/2. Scutum: As wide as or a little wider than long, widest a little posterior to mid length, 1.6 x 1.7 mm- 2.4 x 2.4 mm, flat medianly, convex external to the long, strong lateral carinae; anterolateral margins practically straight, posterolateral margins mildly concave; posterior anle broadly rounded.
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