- Valve is organized around a line (bilateral symmetry)
- Valves symmetrical to transapical axis, asymmetrical to apical axis
- Raphid system well developed, and enclosed within a canal
Note: The specimen(s) pictured to the right are not from Antarctica, excepting Naviculoid example.
![](../images_morphology/07_epithemioid1.jpg)
![](../images_morphology/07_epithemioid2.jpg)
Taxon Name | Basionym | synonyms | ID |
---|---|---|---|
Rhopalodia rupestris | Rhopalodia gibberula var. rupestris | 251 |