Fogedia, Witkowski, Lange-Bertalot, Metzeltin & Bafana, 1997

Kim, Hyesuk, Khim, Jong Seong, Witkowski, Andrzej & Park, Jinsoon, 2022, A new species of Fogedia (Bacillariophyceae) from tidal flats of Northeast Asia, Phytotaxa 554 (1), pp. 77-84 : 82-83

Key to species of the genus Fogedia

1a Cells are heterovalvate .............................................................................................................................................. F. heterovalvata

1b Cells are not heterovalvate .................................................................................................................................................................2

2a Valves with lateral area.......................................................................................................................................................................3

2a Valves without lateral area..................................................................................................................................................................9

3a Central area with stauros-like transverse expansion ..........................................................................................................................4

3b Central area without transverse expansion .........................................................................................................................................5

4a Striae 16-18 in 10 μm ............................................................................................................................................................. F. acuta

4b Striae 9-13, Areolae 35-40 in 10 μm ............................................................................................................................. F. finmarchica

4c Striae 10-12, Areolae 26-29 in 10 μm .............................................................................................................................. F. krammeri

5a External terminal raphe fissure hooked..............................................................................................................................................6

5b External terminal raphe fissure simple or slightly bent......................................................................................................................8

6a Areolae 26-29 in 10 μm............................................................................................................................................................. F. lyra

6b Areolae 35-40 in 10 μm......................................................................................................................................................................7

7a Valves 15.5-18.5 μm long, 6.5-7 μm wide .................................................................................................................. F. christensenii

7b Valves 26-37 μm long, 8-9 μm wide ............................................................................................................................... F. giffeniana

8a Striae parallel in the middle of the valve................................................................................................ F. giffeniana var. yemenitica

8b Striae radiate in the middle of the valve.......................................................................................................................... F. geisslerae

9a Valves elliptic with broad apices ........................................................................................................................................ F. elliptica

9b Valves with distinctively protracted apices ......................................................................................................................................10

10a Striae parallel in the middle of the valve.......................................................................................................................... F. orientalis

10b Striae radiate in the middle of the valve...........................................................................................................................................11

11a Striae 12-14, Areolae 15 in 10 μm...................................................................................................................................... F. coreana

11b Striae 18-21, Areolae 21-24 in 10 μm .................................................................................................................................... F. densa