Landouria species

Nahok, Benchawan, Tumpeesuwan, Sakboworn & Tumpeesuwan, Chanidaporn, 2021, Five new species of the land snail genus Landouria Godwin-Austen, 1918 (Gastropoda, Camaenidae) from northeastern Thailand, with note on genitalia and radula morphology of Landouria diplogramma (Möllendorff, 1902), European Journal of Taxonomy 767 (1), pp. 142-166 : 162

Key to species by shell characters of Landouria species in northeastern Thailand

Finally, in order to facilitate future field research, we provide a dichotomous key for the identification of the currently known Landouria species in northeast Thailand.

1. Shell lustrous, peripheral keel absent, brown band present ................................................................ ............................................................................... L. diplogramma ( Möllendorff, 1902) comb. nov.

– Shell not lustrous, peripheral keel absent, brown band absent ......................................................... 2

2. Peripheral keel blunt ...................................................................................... L. chloritoides sp. nov.

– Peripheral keel sharp ......................................................................................................................... 3

3. Peripheral keel slightly sharp, shell surface with numerous tiny tubercles .... L. tuberculata sp. nov.

– Peripheral keel very sharp, shell surface without tubercles .............................................................. 4

4. Shell relatively large with low spire, shell surface with radial scaly processes ................................. .............................................................................................................. L. trochomorphoides sp. nov.

– Shell relatively moderate in size with high spire, shell surface without radial scaly processes ....... 5

5. Keel more sharp and distinct with its downward bent rim ................................... L. elegans sp. nov.

– Keel sharp, without downward bent rim ........................................................................................... 6

6. Suture indented, growth line obvious ................................................................................................. ............................................................... L. strobiloides C. Tumpeesuwan & S. Tumpeesuwan, 2019

– Suture not indented, growth line obscure ........................................................... L. circinata sp. nov.