(Order Cladocera):
One in a number of somewhat arbitrarily delimited regions on lateral surface of valve. According to position one may distinguish anterior, anterodorsal, anteromedian, anteroventral, dorsal, dorsomedian, median, midanterior, middorsal, midposterior, posterior, posterodorsal, posteromedian, posteroventral, ventral, and ventromedian areas [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.