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Ultrastructure of oligochaete cocoons and polychaete tubes suggest an evolutionary link
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Rossi, Anthony M.. Ultrastructure of oligochaete cocoons and polychaete tubes suggest an evolutionary link. Retrieved from https://doi.org/doi:10.7282/T3WD3Z6Q

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TitleUltrastructure of oligochaete cocoons and polychaete tubes suggest an evolutionary link
NameRossi, Anthony M. (author); Saidel, William M (chair); Shain, Daniel H (internal member); Yakoby, Nir (internal member); Rutgers University; Camden Graduate School
Date Created2013
Other Date2013-05 (degree)
SubjectBiology, Electron microscopy, Polychaeta, Oligochaeta
Extentvii, 31 p. : ill.
DescriptionDespite divergence of several hundred million years, polychaetes and oligochaetes produce tube-like structures. Specifically, polychaetes secrete protective dwellings and/or brood tubes for reproduction, while oligochaetes secrete egg cases or cocoons. Cocoon secretion in oligochaetes is preceded by hypertrophy of glandular Type-II and Type-III cells in a specialized epithelial region, the clitellum. Histological data from the polychaete Phragmatopoma caifornica identified parapodial cells similar to clitellum Type-II cells that may be responsible for the tube sheath that lines the worm’s “sandcastle” home. Further, tubes and cocoons appear to display similar physical properties. Both remain stable when challenged against thermal extremes of heat and cold, proteases and chaotropic agents. Additionally, ultrastructural aspects of tubes and cocoons appear related. Oligochaete cocoons comprise a fibrous cocoon wall sealed at each end with an operculum (i.e., glue-like plugs). Likewise, the polychaete tube sheath from P. californica comprises fibrous shards similar to that observed in the cocoon secreted by Erpobdella obscura. These observations may suggest that the secretory cells and biomaterials that characterize oligochaete cocoons are transformative, and were derived from an ancestral, tube-dwelling polychaete that acquired the ability to seal the ends of its tube.
NoteM.S.
NoteIncludes bibliographical references
Noteby Anthony M. Rossi
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3WD3Z6Q
Languageeng
CollectionCamden Graduate School Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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