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Origin of the crustacean schizoramous limb: A re‐analysis of the duplosegmentation hypothesis
Author(s) -
Zrzavý J.,
Štys P.
Publication year - 1994
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.1994.7060743.x
Subject(s) - biology , crustacean , evolutionary biology , phylogenetics , anatomy , zoology , gene , genetics
Emerson 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.