Revision of the Diplommatinidae (Gastropoda: Cyclophoroidea) from Java Author Hausdorf, Bernhard text Zootaxa 2017 2017-08-29 4312 2 201 245 journal article 32279 10.11646/zootaxa.4312.2.1 d9c9335f-8c7b-4ac9-855f-079fce850cd5 1175-5326 892895 452Fee1D-Da7C-4553-B8Ce-21E4071E97D3 Key to the Opisthostoma species from Java 1a. Aperture pointing backwards or tilted up to 45 degrees, teleoconch coarsely and widely ribbed (19–35 ribs on the penultimate whorl).................................................................................... O. javanicum 1b. Aperture pointing to the upper side, teleoconch finer and more closely ribbed.................................... 2 2a. Shell oblique cylindrical, more coarsely ribbed, peristome distinctly expanded....................... O. uranoscopium 2b. Shell depressed, more finely ribbed, peristome not so strongly expanded........................... Opisthostoma sp.