Knod, Danielle

Balser, Faculty Advisor, Elizabeth

English

Digital Commons @ Illinois Wesleyan University

Illinois Wesleyan UniversityDigital Commons @ IWUJohn Wesley Powell Student ResearchConference 1999, 10th Annual JWP ConferenceApr 17th, 1:30 PM - 2:30 PMPhylum Ctenophora: The Morphology of theCiliated Rosette CellDanielle KnodIllinois Wesleyan UniversityElizabeth Balser, Faculty AdvisorIllinois Wesleyan UniversityFollow this and additional works at: http://digitalcommons.iwu.edu/jwprcThis Event is brought to you for free and open access by The Ames Library, the Andrew W. Mellon Center for Curricular and FacultyDevelopment, the Office of the Provost and the Office of the President. It has been accepted for inclusion in Digital Commons @ IWU bythe faculty at Illinois Wesleyan University. For more information, please contact digitalcommons@iwu.edu.©Copyright is owned by the author of this document.Knod, Danielle and Balser, Faculty Advisor, Elizabeth, "Phylum Ctenophora: The Morphology of the Ciliated Rosette Cell"(1999). John Wesley Powell Student Research Conference. 11.http://digitalcommons.iwu.edu/jwprc/1999/posters2/11THE JOHN WESLEY POWELL STUDENT RESEARCH CONFERENCE " APRIL 1999 Poster Presentation 1 8  PHYLUM CTENOPHORA: THE MORPHOLOGY OF THE CILIATED ROSETTE CELL Danielle Knod and Elizabeth Balser* Department of Biology, lllinois Wesleyan University Comb jellies or ctenophores are delicate, trasnsparent animals characterized by eight meridional rows of cilia. Ctenophores are for the most part pelagic animals with a few benthic species (Ruppert and Bames 1 994). These animals have two main body cavities, the gastrovascular system (gvs) and the mesoglea. The gvs is a series of canals in which digestion of food and circulation of nutrients and water occurs. The mesoglea is a connective tissue compartment situated between the gvs and the outer epidermis.  The only known connection between these two compartments is provided by specialized cells called the ciliated rosette cells. The rosette cells form a canal that opens between the gvs and the mesoglea (Hernandez-Nicaise 199 1 ). With the exception of the work of Hernandez-Nicaise ( 1 99 1 ) , little is kown about the structure of these cells in adults, and published accounts of the cells in larvae are lacking. The work presented here describes the morphology of the rosette cell in cydippids, the planktonic larvae of ctenophores. As in adults, the rosette cells in larvae are located on the meridional canals of the gvs. Two ciliated cells form a pair of superimposed rings lining each side of the aperture. The cilia are arranged in a conical tuft and beat synchronously with each other into the center of the canal created by the two rings (Hyman 1 940). The function of the rosette cell is unknown; however, Hyman ( 1940) proposes that they function to regulate water balance in the mesoglea. Although a selective excretory filter has not been identified, an alternative hypothesis of the function of the rosette cells is excretion of water and metabolites from the mesoglea into the gastrovascular system. 

\u3cem\u3ePhylum Ctenophora\u3c/em\u3e: The Morphology of the Ciliated Rosette Cell

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\u3cem\u3ePhylum Ctenophora\u3c/em\u3e: The Morphology of the Ciliated Rosette Cell

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