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Development of the five primary podia from the coeloms of a sea star larva: homology with the echinoid echinoderms and other deuterostomes.
Proceedings. Biological Sciences 2009 April 8
Confocal laser scanning microscopy of larvae of the asteroid Parvulastra exigua was used to investigate the development of the five primary podia from the coeloms in the echinoderm phylum in an approach to the problem of morphological homology in the deuterostome phyla. The development is shown from an early brachiolaria larval stage to a pre-settlement late brachiolaria larval stage. In the early brachiolaria larva, a single enterocoele connected to the archenteron has formed into two lateral coeloms and an anterior coelom. The primary podia form from the coelomic regions on the left side of the brachiolaria larva, while on the right the coelomic regions connect with the exterior through the pore canal and hydropore. The anterior coelom forms the coelom of the brachia. Homology between the primary podia of the asteroid and the echinoid classes of echinoderms is described and extended to coeloms of other deuterostome phyla.
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