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Relationships Between Arthrodial Membrane Formation and Addition of Setae To Swimming Legs 1-4 During Development of Dioithona Oculata, Ridgewayia Klausruetzleri, Pleuromamma Xiphias, and Temora Longicornis (Copepoda)

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Relationships between arthrodial membrane formation and the addition of setae to the exopod and endopod of swimming leg 3 of the cyclopoid copepod Dioithona oculata are derived from formation homologies during development. Based on this information, these relationships are inferred for the remaining swimming legs of the cyclopoid and the swimming legs of three calanoids, Ridgewayia klausruetzleri, Pleuromamma xiphias, and Temora longicornis. Most of the variation in setal numbers for a leg among the four copepods is expressed in the distal segment of each ramus. The most striking differences in architecture result from a delay or failure in expression of the arthrodial membranes which separate the proximal segment or the middle segment of the ramus from the distal segment. Inferring a composite model for relationships between arthrodial membrane formation and addition of setae to the exopod and endopod of a swimming leg is complicated by differences in swimming leg 1 and the remaining swimming legs which includes an earlier allocation of the proximal seta of the middle (third) segment to both rami of swimming leg 1. These developmental patterns are presumed to be derived, and the endopod of all thoracopods of the ancestral copepod immediately after the transformation of the leg bud is presumed to have been 2-segmented with one medial seta on the proximal segment.

Affiliations: 1: ) Department of Invertebrate Zoology MSC/MRC 534, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, U.S.A.; 2: ) 2634 Woodley Place, Falls Church, VA 22046, U.S.A.

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