This genus is associated with red tides; individuals vary considerably in size and form, ranging from almost circular in outline to ellipsoidal and sometimes with a tail; with 2 flagella; many chloroplasts which give the cell a yellow-brown colour; some species have pyrenoids, some form cysts, some have mucocyssts; marine habitats.

Depth range based on 17 specimens in 2 taxa.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0 - 89
  Temperature range (°C): 23.606 - 23.606
  Nitrate (umol/L): 10.982 - 10.982
  Salinity (PPS): 34.591 - 34.591
  Oxygen (ml/l): 1.903 - 1.903
  Phosphate (umol/l): 0.933 - 0.933
  Silicate (umol/l): 13.618 - 13.618

Graphical representation

Depth range (m): 0 - 89
 
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