Novel embryogenesis in a nudibranch gastropod: segregation, expulsion, and abandonment of deeply pigmented egg cytoplasm.(Report)

The Biological Bulletin | December 1, 2007| | Copyright

Cases where early development has changed substantially and rapidly, without altering later morphogenesis, can be informative about developmental organization and adaptation. I describe a surprising novelty of early embryogenesis in the arminacean nudibranch Madrella sanguinea from the southeastern coast of Australia. Fertilized eggs of this species segregated a large mass of red-pigmented cytoplasm to the vegetal pole, where much of it was extruded as a type of polar lobe during the first two cleavages. A packet of red material detached from the embryo before the gastrula ...

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