Some views on Indo-Australian Phaedusinae and the establishment of a new subgenus

The Clausiliidae of the Indo-Australian archipelago belong to six genera: Hemiphaedusa, Phaedusa, Pseudonenia, Acrophaedusa, Euphaedusa and Paraphaedusa. The first mentioned four genera occur on the Malay Peninsula and/or on one or more islands of the Sunda shelf, the last mentioned two genera live mainly on some of the islands between the Sunda and the Sahul shelf. Let us first consider the four genera from the Sunda shelf. Doubtless they, or their ancestors invaded the area from Further India via Malaya.