LOGO River diatoms: a multiaccess key
[Home] [Taxa] [Characters] [Environment] [Credits] [Introduction] [Manual] [Glossary]

You are in: Home>>character sets>>Size and shape>>If elliptic or elongate, transapical symmetry

If elliptic or elongate, transapical symmetry

Description
Outline of pennate diatoms, when seen in valve view.


State: Isopolar

valve view brightfield Navicula gregaria

Description
Both ends are identical in size and shape.


State: Heteropolar

Gomphonema augur

Description
One end differs from the other in size and/or shape.

Comments to: Diatom Key Development Team