• Rostrum absent
• Head small and depressed
• Cervical sinus present
• Postabdominal claw with central pecten: two pecten morphotypes have been found in C. dubia (1). A fine pecten morph consisting of 18-24 narrow teeth with nearly parallel sides and an uncommon toothed pecten morph which has 7-14 close set ovately tapered teeth. The pecten on the fine morph may be indistinguishable at magnifcation powers less than 400x.

• View: male C. dubia

• May be closely related and commonly confused with Ceriodaphnia reticulata; hybridization may occur between the two.
• Commonly used in toxicological bioassays by the US EPA.

(1) BERNER, D.B. 1986. Taxonomy of Ceriodaphnia (Crustacea: Cladocera) in U.S. Environmental Protection Agency cultures.   EPA/600/4-86/032.