Traits taxon details
original description
Hidalgo, J. G. (1888). Recherches conchyliologiques de M. Quadras aux ȋles Philippines (suite). <em>Journal de Conchyliologie.</em> 36(1): 30-97, pls. 4-6., available online at https://www.biodiversitylibrary.org/page/15979966#page/38/mode/1up page(s): 82, pl. 5, fig. 3; note: with 3 varieties [details]
additional source
Clench, W. J. & Archer, A. F. (1931). Land shells from Lubang Island, Philippines. <em>Occasional Papers of the Boston Society of Natural History.</em> 5: 333-339, pl. 17., available online at https://www.biodiversitylibrary.org/page/34576677 page(s): 337 [details]
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