Synurid

The synurids are a small group of heterokont algae, found mostly in freshwater.

Characteristics

They are covered in silicate scales and spines. These are formed on the surface of the chloroplasts, of which there are usually two, but sometimes only one divided into two lobes. The cells have two heterokont flagella, inserted parallel to one another at the anterior, whose ultrastructure is a distinguishing characteristic of the group. Both asexual and isogamous sexual reproduction occur.

Genera

There are two major genera included here, divided into species mainly based on the structure of the scales.

Both are common plankton in lakes and ponds.