Larval and metamorphic development of the foregut and proboscis in the caenogastropod Marsenina (Lamellaria) stearnsii

Journal of Morphology
L R Page

Abstract

The specialized, postmetamorphic feeding structures of predatory caenogastropods evolved by changes to an ancestral caenogastropod developmental program that generated a planktotrophic larval stage followed by a herbivorous postmetamorphic stage. As part of a program of comparative studies aimed at reconstructing these developmental changes, I studied the development of the postmetamorphic feeding system of Marsenina stearnsii using histological sections for light microscopy and scanning and transmission electron microscopy. The feeding system of this species has two very different designs during ontogeny. The larval system uses ciliary effectors to capture and ingest microalgae, whereas the juvenile/adult system includes a proboscis, jaws, and radular apparatus for predation on ascidian zooids. The postmetamorphic foregut begins to develop during the early larval phase, but the anlagen does not interfere with larval feeding because it develops as an increasingly elaborate outpocketing from the ventral wall of the larval esophagus. At metamorphosis, an opening is created in the anterior tip of the prospective, postmetamorphic buccal cavity and the margins of this opening anneal with the metamorphically remodeled lips of the lar...Continue Reading

References

Oct 1, 1982·Journal of Ultrastructure Research·D B Bonar, T K Maugel
Sep 1, 1999·Proceedings of the National Academy of Sciences of the United States of America·T F Duda, S R Palumbi
Aug 11, 2000·Evolution; International Journal of Organic Evolution·A E Faivre
Nov 1, 1960·Stain Technology·K C RICHARDSONE H FINKE
Apr 1, 1999·Evolution; International Journal of Organic Evolution·R P Guralnick, D R Lindberg

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Citations

Apr 20, 2018·Molecular Biology and Evolution·Leon HilgersThomas von Rintelen
Apr 3, 2009·Social Neuroscience·Jeannine Pinto, Maggie Shiffrar
Nov 6, 2018·Genome Biology and Evolution·Keisuke ShimizuKazuyoshi Endo
Nov 30, 2012·Journal of Morphology·Louise R Page, Samuel J Ferguson
Sep 30, 2010·Developmental Biology·Shunsuke YaguchiKazuo Inaba

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