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Abdominal segment formation in Spirorbis moerchi (Polychaeta)

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Summary

The development of abdominal segments in Spirorbis moerchi (Polychaeta: Annelida) was studied by light and electron microscopy. Abdominal segments develop in strict succession from anterior to posterior. Segmentation is initiated in the mesoderm and is followed by segmentation of the ectoderm. The mesoderm of the abdominal segments arises entirely from pygidial residual mesoderm; inward migration of cells from the pygidial ectoderm to give rise to mesoderm does not occur. The primordial germ cells remain distinct from the residual mesoderm of the pygidial growth region. After several abdominal segments have developed, the primordial germ cells “migrate” posteriorly from the achaetous region, invade the abdominal segments, and give rise to the retroperitoneal gonads. Abdominal segment formation is discussed in terms of heteronomy, primordial germ cell origin, gonad formation, and development of the circulatory system.

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  1. Department of Zoology, University of Massachusetts, 01003, Amherst, MA, USA

    Herbert E. Potswald

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  1. Herbert E. Potswald
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Potswald, H.E. Abdominal segment formation in Spirorbis moerchi (Polychaeta). Zoomorphology 97, 225–245 (1981). https://doi.org/10.1007/BF00310278

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  • DOI: https://doi.org/10.1007/BF00310278

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