• 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