Gastroptychia Kobelt & Mollendorff 1900

Key to the Gastroptychia from northeastern India 1 Shell height larger than 5 mm ....................................... Gastroptychia insignis (Godwin-Austen, 1870) - Shell height smaller than 5 mm .......................................................................... 2 2 Ribs of the teleoconch dense (> 5 ribs per 0.5 mm on the body whorl).................. Gastroptychia geoffreyi sp. nov. - Ribs of the teleoconch spaced (> 5 ribs per 0.5 mm on the body whorl)........................................... 3 3 A palatal swelling and a palatal lamella present ..................................... Gastroptychia collicola sp. nov. - Horizontal palatal lamella absent........................................................................ 4 4 Shell height larger than 3 mm ....................................... Gastroptychia gibbosa (W. T. Blanford, 1868) - Shell height smaller than 3 mm .......................................................................... 5 5 Approximately 9 ribs on the penultimate whorl when view from the aperture side................................................................................................ Gastroptychia gibberosa (Godwin-Austen, 1892) - Approximately 13 ribs on the penultimate whorl when view from the aperture side................................................................................................. Gastroptychia jaintiaca (Godwin-Austen, 1870)