Gastroptychia, Kobelt & Mollendorff, 1900

Chen, Zhe-Yu & Ablett, Jonathan D., 2024, Two new Gastroptychia Kobelt & Möllendorff, 1900 from Darjeeling and West Khasi Hills, northeastern India (Gastropoda: Cyclophoroidea: Diplommatinidae), Zootaxa 5538 (1), pp. 79-88 : 80

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)