106 ALGAE IN PHYTOPLANKTON OF THE UNITED STATES 



Division Cryptophyta 

 Class Cryptophyceae 

 Order Cryptomonidales 

 Family Cryptochrysidaceae 

 GENUS CHROOMONAS Hansgrirg, 1892 (fig. 47) 



MORPHOLOGY 



Solitary, motile cells are compressed. The anterior end is truncated, 

 and the posterior end is rounded. A longitudinal furrow is at the 

 anterior end near the point of insertion of 2 unequal flagella. An 

 eyespot and granules may be present. The single laminate 

 chromatophore is blue green. 



REPRODUCTION 



Longitudinal division of the protoplast results in the formation of 2 

 daughter cells. Rosenberg (1944) observed a palmella stage. 



OCCURRENCE 



The alga is common in shallow waters and among algal masses and 

 decaying vegetation (Prescott, 1962). 



ENVIRONMENTAL CONDITIONS 



Standard 

 Range Mean deviation 



Temperature degrees Celsius 0.0 - 33.5 



pH 4.3 - 8.9 



Dissolved oxygen milligrams per liter .1 - 17.0 



Specific conductance micromho 21 -47,800 



Total alkalinity milligrams per liter - 477 



Total hardness do 4 - 1,700 



Total nitrogen do .01- 24.0 



Total phosphorus do .0 - 3.5 



SPECIES INFORMATION 



Refer to Lackey (1939), Pascher (1913), and Prescott (1962). 



