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This may be a bit naive or ignorant of the latest in developmental biology, but isn't one of the things that sets annelid/arthropod and deuterostome segmentation apart from strobilation (tapeworms, scyphozoans) and exoskeletal only (e.g. kinorhynchs)the involvement of mesoderm? Segmenting an animal by stretching mesodermal septa across the coelomic cavity is possible only in eucoelomates. It would seem that even similar expression in non-eucoelomates, for example pseudocoelomates, would be obscured by the lack of mesodermal septa, and all of the accompanying functional goodies. However, keep in mind that I am not implying homology of annelid/arthropod and deuterostome coelomic development (schizocoelous and enterocoelous). Peter Roopnarine "We have no adequate framework for law in a historical science, and history in a lawful science." Stuart Kauffman, At Home in The Universe. Dr. Peter D. Roopnarine Department of Biology Southeast Missouri State University Cape Girardeau MO 63701 Phone:(573)651-2365 email:proopnar@biology.semo.edu web:http://biology.semo.edu Dr. Kim Driver Dept. of Biology Southeast Missouri State University One University Plaza M/S 6200 Cape Girardeau MO 63701 e-mail kdriver@biology.semo.edu web http://biology.semo.edu
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