- Valve is organized around a line (bilateral symmetry)
- Valves symmetrical to transapical axis, asymmetrical to apical axis
- Raphid system well developed
- Valves with apical porefields that secrete mucilaginous stalks or tubes
Note: The specimen(s) pictured to the right are not from Antarctica, excepting Naviculoid example.
| Taxon Name | Basionym | synonyms | ID |
|---|---|---|---|
| Cymbopleura naviculiformis | Cymbella naviculiformis | 127 | |
| Encyonema silesiacum | Cymbella silesiaca | 141 | |
| Encyonema vulgare | 142 | ||
| Gomphonema affine var. affine | 165 | ||
| Gomphonema exilissimum | Gomphonema parvulum var. exilissimum | 166 | |
| Gomphonema parvulum var. parvulum | 167 | ||
| Gomphonema possessionense | 285 | ||
| Gomphonema stonei | 168 | ||
| Gomphonema subantarcticum | Gomphonema angustatum var. aequalis f. kerguelense | 286 |
