- (Order Cladocera):Any one of variously modified individuals in a population. These modifications are seasonal and generally involve the head (development of helmet) or changes in eye size or carapace spine length [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.
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John Dundee — John Wharry Dundee, OBE, was a Northern Ireland born anaesthetist and prolific medical researcher. cite web url = http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1891798 title = The evolution of sites of surgery publisher = Ulster… … Wikipedia
helmet — (Order Cladocera): Helmet shaped elongation of anterior margin of head in certain individuals of a population. Appearance of helmeted individuals and shape of helmet is governed by environmental and genetic factors. (See also cyclomorph)… … Crustacea glossary