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 genitalia characters of Landouria species in northeastern Thailand

1. Penis shorter than vagina; flagellum strobilus-like ............................................................................. ............................................................... L. strobiloides C. Tumpeesuwan & S. Tumpeesuwan, 2019

– Penis longer than vagina; flagellum non-strobilus-like .................................................................... 2

2. Flagellum circinate ............................................................................................. L. circinata sp. nov.

– Flagellum like a short protrusion, ovate or elongate ovate ............................................................... 3

3. Flagellum elongate ovate, slender towards tip; inner sculpture of flagellum simple ......................... .............................................................................................................. L. trochomorphoides sp. nov.

– Flagellum ovate or elongate ovate; inner sculpture of flagellum with longitudinal pilasters ........... 4

4. Vagina shorter than free oviduct; inner penis without verge ................................ L. elegans sp. nov.

– Vagina as long or longer than free oviduct; inner penis with verge ................................................. 5

5. Vagina as long as free oviduct ....................................................................... L. chloritoides sp. nov.

– Vagina longer than free oviduct ........................................................................................................ 6

6. Inner wall of penis with wavy, corrugated slender longitudinal pilasters; short, hollow verge ......... ......................................................................................................................... L. tuberculata sp. nov.

– Inner wall of penis with stout, longitudinal, zigzag, pilasters; short, rounded verge ......................... ............................................................................... L. diplogramma ( Möllendorff, 1902) comb. nov.