Dissertation/Thesis Abstract

Development of Lecithotrophic Trochophore-like pilidium nielseni Found in Five Lineiform Species (Lineidae; Heteronemertea; Pilidiophora; Nemertea) from Oregon
by Hunt, Marie Katherine, M.S., University of Oregon, 2016, 133; 10142323
Abstract (Summary)

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.

Indexing (document details)
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
Subjects: Biology
Keywords: Lecithotrophic development, Nemertea, Pilidium
Publication Number: 10142323
ISBN: 978-1-339-97637-2
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