Abstract
AbstractEmerson and Schram's hypothesis of a duplosegmental origin of the crustacean schizoramous (biramous) limb is confronted with new data on the phylogeny of arthropods and their mechanisms of development. The hypothesis is considered to be falsified since (a) the cephalic segments of the crustaceans bear schizoramous limbs but still seem to be homologous to those of the hexapods; (b) the embryonic origin of crustacean segments, limbs, and neuromeres appears to be the same as in the hexapods; (c) no genetic mechanism allowing for duplosegmentation in the crustaceans seems to exist.
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