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and Compound eyes are present in most crus- taceans but lacking in the subclasses Mys- tacocarida, Podocopa, Copepoda, and the orders Thermosbaenacea and Speleogripha- cea. In the subclass Cirripedia only the cy- pris larva possesses compound eyes. Usu- ally the compound eye has a pigment shield which fulfils important functions in screen- ing and modifying the incoming light. With a comparatively limited number of optical principles (D.-E. Nilsson, 1988), one would expect a restricted number of pigment cell types and arrangements coordinated with the optics. However, the pigment shield dis- plays a large number of different pigment cells and constructions. To add to the con- fusion, the information concerning the pig- ment shield is scattered in articles published during the last hundred years. The aim of this work is to bring together the most relevant contributions on absorb- ing and reflecting pigment (=the pigment shield or screening pigment) to form a unify- ing terminology and to develop some ideas in the evolution of a pigment shield in a crustacean compound eye. GENERAL REMARKS In this study it is suggested that the com- pound eyes, with regard to their pigment cells, can be arranged in four groups with different
Journal of Crustacean Biology – Brill
Published: Jan 1, 1989
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