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Identity of the Distal Segments of the Maxilla 2 and Maxilliped in Copepods: New Teeth for Carl Claus' Old Saw

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Interpretations by Claus and Giesbrecht of the identity of the distal segments of the maxilla 2 and maxilliped in copepods are reviewed. The developmental pattern of setal additions to these appendages suggests that the distal segments of maxilla 2 are exopodal, while those of the maxilliped are endopodal; these data are consistent with the interpretation of Claus. Information about the genetic regulation of development of a fruitfly, and a reinterpretation of a fossil arthropod also support Claus. A general hypothesis identifies a compartment with a contralateral pair of uniramal limbs as the basic division of the body of an ancestral arthropod. Somites, crustacean biramal appendages, and insect uniramal appendages are derived. The general hypothesis is used to explain the structure of a copepod including maxilla 2 and maxilliped.


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Affiliations: 1: Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., 20560, U.S.A.


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