The structure of the urocoptid closing device (UCD) was studied under the SEM in the only species in which it has been reported to occur. Over 40 urocoptid species were searched in vain for additional occurrences. When moistened, the UCD expands and may function in an analogous way to the clausiliid clausilium. The two devices are clearly not homologous.

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Nederlandse Malacologische Vereniging

E. Gittenberger, & P. Mordan. (2002). The urocoptid closing device, rare and remarkable (Gastropoda, Pulmonata, Urocoptidae). Basteria, 66(4/6), 123–127.