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HONEYCOMBING OF THE CARAPACE IN THE CHYDORID CLADOCERA: THE ELUSIVE MALE OF CHYDORUS FAVIFORMIS

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ABSTRACT Unlike the other honeycombed taxa in the genus Chydorus, the males of North American C. faviformis completely lose their honeycombed exterior on molting to instar III, at which time they closely resemble mature males of a nonhoneycombed species of Chydorus that can co-occur. The honeycomb pattern in these chydorids results from thin sclerotized extensions of the shell and head, whereas the honeycomblike pattern sometimes present in Pleuroxus trigonellus and a few other species results from the coalescing of columns of secreted material, which can be loosened easily (as by weak detergents) and sloughed off in ragged pieces. The honeycombed taxa in Chydorus are so different from one another in certain conservative aspects of morphology, particularly of the males, that it is reasonably certain honeycombing has arisen more than once during evolution.

Affiliations: 1: Department of Biology, Indiana University, Bloomington, Indiana 47405.

10.1163/1937240X82X00158
/content/journals/10.1163/1937240x82x00158
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/content/journals/10.1163/1937240x82x00158
2017-12-18

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