(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. . 2011.

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  • 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

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