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Ultrastructure of the Circulatory System of the Phoronid Phoronopsis harmeri Pixell, 1912. 2. Main vessels

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Abstract

The ultrastructure of the wall of the main blood vessels of the phoronid Phoronopsis harmeri is described. The walls of the lophophoral and left lateral vessels consist of myoepithelial cells of the coelomic lining (peritoneal cells), a thin basal lamina, and an incomplete endothelial lining. In the head region of the body, the wall of the medial vessel consists of myoepithelial cells of the coelomic lining (peritoneal cells), a basal lamina, and true muscular endothelial cells. The anterior part of the medial vessel functions as the heart. In the anterior part of the body, the medial vessel wall consists of five layers: the external nonmuscular coelothelium, a layer of the extracellular matrix, the internal muscular coelothelium, an internal layer of the extracellular matrix, and an incomplete endothelial lining. The complicated structure of the medial vessel wall may be explained by the superimposition of the lateral mesentery on the ordinary vessel wall.

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Authors and Affiliations

  1. Institute of Marine Biology, Far East Division, Russian Academy of Sciences, Vladivostok, 690041, Russia

    E. N. Temereva

  2. Department of Biology, Moscow State University, Moscow, 119899, Russia

    V. V. Malakhov

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  1. E. N. Temereva
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  2. V. V. Malakhov
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Temereva, E.N., Malakhov, V.V. Ultrastructure of the Circulatory System of the Phoronid Phoronopsis harmeri Pixell, 1912. 2. Main vessels. Russian Journal of Marine Biology 30, 101–112 (2004). https://doi.org/10.1023/B:RUMB.0000025986.39734.83

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