Opeas didyma (Westerlund, 1883)
Westerlund (1883) original descriptions Stenogyra didyma – “Testa rimata, subulata, confertim tenue striata, striis extus curvatis, vitrea, nitidula; apex obtusus; anfr. 7½, superi convexi, primi subcylindracei, caeteri convexiusculi, omnes superne truncatuli, sutura profunda, marginata, crenulata, superne subhorizontali, deinde oblique disjuncti, apert. subtrigono-piriformis, basi obtuse, pariete minus oblique et margine columellari angulum profundum formantibus; margo colum. fere rectus, basi non torquatus, reflexus, perforationem fere tegens, marg. Dextro levissime curvato.”
Stenogyra didyma – “Long. vix 8, diam. 2 ½ mm.” (Westerlund, 1883)
Type locality – “Malacca, Singapore” (Westerlund, 1883)
“Recorded by its author from Singapore, it does not seem to have been found since.” (Laidlaw, 1933)