Synonym: Glycymeris insignis Pilsbry, 1906. Shell length to 25 mm. Sculpture: approximately 22 raised, gently rounded ribs, obsolete dorsally; interstices narrow; fine concentric lamellar sculpture covers the shell surface, usually with four to six concentric growth pauses. Colour: off-white, with red-brown chevrons at the dorsal margins and sparse recurved lines of the same colour scattered on the ribs; interior white. Periostracum: smooth, sparse, red-brown, marginal. Habitat: sand, to 64 metres. Distribution: south Western Australia, South Australia, Victoria and Tasmania.

Described as Glycymeris insignis (synonymous)
Roundly trigonal, thick, solid, inequilateral; posterior side longer and subangular; anterior side rounded; posterior dorsal slope flat; valves whitish in the middle and anteriorly, pinkish orange posteriorly; sculpture of about 17 low rounded radial ribs with narrower interstices, and about six strong, broad, unequal concentric waves separated by deep constrictions; sculpture weak anteriorly and wanting on the flat posterior, three or four near the middle very small and somewhat irregular; a small triangular area below the umbos with about six widely diverging grooves; ventral margin coarsely crenulate within. Holotype: length 23 mm., height 24 mm., section 31.2 mm. Type locality: Geographe Bay, Western Australia. Specimen figured, length 37 mm., height 38 mm., section 20 mm.
Examples of the South Australian shell may measure up to 39 mm. x 40 mm. x 41 mm. maximum. Ventricosity varies greatly. There is a marked tendency to periods of rest in its growth, so as to produce, at intervals of about five millimetres, concentric steps from a half to one millimetre in depth; there are usually four of these, but there may be six, closer and less valid, until in the senile stage, when the shell increases much in obesity and very little in height they are reduced to close-set concentric striae. Most examples show scarcely any colour markings on their dirty-white surface; but some are irregularly sparsely dotted in somewhat zig-zag concentric lines with reddish-brown, and have four broad curved dark purple-brown flames crossing the anterior and posterior marginal areas of the shell.