As Glumebra shionomisakiensis Habe, 1953
Tube calcareous, club-shaped or contorted and gregarious. Shell small, consisting of three areas; the anterior area small, triangular, white, covered with a brown periostracum, sculptured with about ten dental ridges that radiate from the anterior sinus and run backward ; median area narrow, also covered with a brown periostracum ; anterior median area bears several dental ridges which join those of the anterior area; middle and posterior median areas narrow and only marked by the growth lines; the posterior area or auricle almost completely eroded; the interior is bluish white; the middle median area represented by a deep groove, extending from the umbo to the knob at the ventral end ; the posterior area attached to the posterior median area, forming a distinct shelf ; the blade is long and thin, slightly expanded at the distal part, about half of the length of shell; the pallets are spade-shaped with a short stalk, flattened internally and a little convex externally; the base of the blade is white, covered with a brown periostracum, solid and thick, while the distal part of the blade is brown and is marked by a series of the longitudinally radiating ribs.
Shell; height 4.7 mm., length 2.7 mm., breadth 4.8 mm. (conjoined valves) (figured type specimen)
Pallet: length 6.1 mm., breadth 2.5 mm., length of stalk 2.8 mm. (the same specimen). Type locality: Shionomisaki, Wakayama Pref., Honshu (collected by Mr. Fusao Ogawa).
Remarks; This new species closely resembles the Australian species, Glumebra elegans Iredale which is the type species of this genus, in the general feature of shell, however, the pallets of the former are considerably different from the latter specifically, viz. they are broader and more attenuate to the top and with the large basal part and small radiating part. Glumebra panamensis (Bartsch) is a quite different form in the shape of the pallet. Glumebra clava (Gmelin) from Mauritius is not known completely in the recent taxonomic sense.