MolluscaBase taxon details
original description
(of Hapalus umbilicatus Möllendorff, 1890) Möllendorff, O. F. von. (1890). Die Landschnecken-Fauna der Insel Cebu. <em>Bericht über die Senckenbergische Naturforschende Gesellschaft in Frankfurt-am-Main.</em> (1890): 189-292, pls 7-9., available online at https://biodiversitylibrary.org/page/9003882
page(s): 245, pl. 8, fig. 6 [details]
basis of record
Pilsbry, H. A. (1906-1907). Manual of conchology, structural and systematic, with illustrations of the species, Second series: Pulmonata. Vol. 18. Achatinidae: Stenogyrinae and Coeliaxinae. Conchological Department, Academy of Natural Sciences,Philadelphia. 357 pp., available online at https://www.biodiversitylibrary.org/page/1099785
page(s): 71, pl. 9, figs. 64, 65 [details]