Evadne spinifera

Taxon-Order: 
Diplostraca

click on image for more illustrations

Distribution: 
World-wide, absent from sub-polar waters.
Size: 
0.9-1.35 mm
Diet: 
Phytoplankton.
Useful Facts or Characters: 

Nearly transparent with a prominent compound eye; females are egg-shaped from lateral view, with a terminal carapace spine.

Natural History: 

The embryos can be seen and counted just before release from the brood pouch.

References: 

http://eol.org/pages/338929/details

Rammner, W. (1939) Cladocera. Conseil International pour L'Exploration de la Mer Zooplankton Sheet 3: 1-4.