- Valve is organized around a line (bilateral symmetry)
- Lack a raphe system, and therefore lack motility
- Rimoportulae (labiate process) may be present
Note: The specimen(s) pictured to the right are not from Antarctica, excepting Naviculoid example.
| Taxon Name | Basionym | synonyms | ID |
|---|---|---|---|
| Fragilaria capucina s.l. | 150 | ||
| Fragilaria germainii | Diatoma germainii | 154 | |
| Fragilaria germainii f. acostata | Fragilaria bicapitata var. grandis | 155 | |
| Fragilaria husvikensis | 156 | ||
| Fragilaria pulchella | Synedra pulchella, Synedra familiaris | 157 | |
| Morphotype 1 cf. F. cap. var. vaucheriae | Fragilaria vaucheriae | 151 | |
| Morphotype 2 cf. F. cap. var. rumpens | Synedra rumpens, Synedra rumpens var. familiaris | 152 | |
| Morphotype 3 cf. F. cap. var. gracilis | Synedra rumpens var. familiaris, Synedra famelica, (?) Fragilaria vaucheriae var. longissima, (?) Fragilaria vaucheriae. var. | 153 | |
| Opephora naveana | Fragilaria opephoroides | 214 | |
| Stauroforma exiguiformis | Fragilaria virescens var. exigua, Fragilaria exigua, Fragilaria exiguiformis | 252 | |
| Staurosira alpestris | Fragilaria alpestris | Staurosirella alpestris | 326 |
| Staurosira circula | 262 | ||
| Staurosira jolinae | 263 | ||
| Staurosira leptostauron | Fragilaria leptostauron | 264 | |
| Staurosira martyi | Opephora martyi, Fragilaria martyi, Martyana martyi | 265 | |
| Staurosira pinnata | Fragilaria pinnata | 266 | |
| Staurosira venter | Fragilaria venter, Fragilaria construens var. venter | 267 | |
| Tabularia fasciculata | Fragilaria fasciculata | 269 |
