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The pilidium larva is an idiosyncrasy defining the Pilidiophora. Its development is unique, and conserved even in derived pilidia; the juvenile is formed via a series of invaginations of the larval epidermis (imaginal discs), then bursts through the larval body while simultaneously consuming it in catastrophic metamorphosis. Pilidium nielseni is a lecithotrophic pilidium with two circumferential ciliary bands reminiscent of the “prototroch” and “telotroch” of a trochophore larva, the ancestral larval form of spiralians. However, pilidium nielseni represents a convergence on this larval form, not the resurgence of the ancestral larva, and typical pilidial development is conserved. In this thesis, I describe the development of pilidium nielseni, and determine it has converged on its body plan at least twice, independently.
| Advisor: | Maslakova, Svetlana |
| Commitee: | Emlet, Richard, Sutherland, Kelly |
| School: | University of Oregon |
| Department: | Biology |
| School Location: | United States -- Oregon |
| Source: | MAI 55/05M(E), Masters Abstracts International |
| Source Type: | DISSERTATION |
| Subjects: | Biology |
| Keywords: | Lecithotrophic development, Nemertea, Pilidium |
| Publication Number: | 10142323 |
| ISBN: | 9781339976372 |
