Serratifera

Li, Chun L., Witkowski, Andrzej, Ashworth, Matt P., Dąbek, Przemysław, Sato, Shinya, Zgłobicka, Izabela, Witak, Malgorzata, Khim, Jong Seong & Kwon, Chun-Jung, 2018, The morphology and molecular phylogenetics of some marine diatom taxa within the Fragilariaceae, including twenty undescribed species and their relationship to Nanofrustulum, Opephora and Pseudostaurosira, Phytotaxa 355 (1), pp. 448-450 : 448-450

Key to species within Serratifera

1a Each stria composed of one areola only restricted on valve face ........................................................................ S. varisterna

1b Each stria composed of one (very rarely two) areolae on both valve face and mantle.......................................................... 2

2a Marginal spines absent ........................................................................................................................................... S. namibica

2b Marginal spines present.......................................................................................................................................................... 3

3a Marginal spines present, with “accessory” spines flanking the larger central spines .......................................... S. rhombica

3b Marginal spines are simple, slit-like or spatulate, without “accessory” spines...................................................................... 4

4a Lateral projections associated with the base of marginal spines present ............................................................................... 5

4b Lateral projections associated with the base of marginal spines absent ................................................................................ 6

5a Lateral projections originating from one side of marginal spines and extending to valve mantle ....................... S. corallina

5b Lateral projections originating from the surrounding of marginal spines and extending to valve mantle ......... S. nosybeana

6a Granules around the base of marginal spines present ............................................................................................................ 7

6b Granules around the base of marginal spines absent.............................................................................................................. 8

7a Valve lanceolate-clavate with narrowly cuneate foot apices ....................................................................................... S. brevis

7b Valve clavate or oval with broadly-round or cuneate foot apices .......................................................................................... 9

8a Virgae are obviously thickened and elevated, and striae are concave ...................................................................... S. clavata

8b Virgae and striae are flat....................................................................................................................................................... 10

9a Foot apices broadly-round ...................................................................................................................................... S. punctata

9b Foot apices broadly-cuneate ................................................................................................................................... S. sourniae

10a Width of valves is 1.5–2.0 µm .................................................................................................................................... S. parkii

10b Width of valve exceeding 2 µm............................................................................................................................................11

11a Stria density 10–12 /10 µm ............................................................................................................................ S. opephoroides

11b Stria density higher than 13 /10 µm ..................................................................................................................................... 12

12a Length: 6.0–9.0 µm, width: 2.0–2.5 µm and stria density 17–18 /10 µm ................................................................ S. takanoi

12b Length: 3.5–21 µm, width: 2.0–5.0 µm and stria density 14–17/ 10 µm ........................................................... S. andersonii