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Haemal and coelomic circulatory systems in the arms and pinnules ofFlorometra serratissima (Echinodermata: Crinoidea)

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Summary

The haemal and coelomic circulatory systems in arms and pinnules of a stalkless crinoid are described by transmission electron microscopy, and the coelomic topography is revealed by scanning electron microscopy of corrosion casts and peritoneal surfaces. In addition, the route of the coelomic circulation in the living crinoid is shown by injection of carmine particles, and sites of peritoneal phagocytosis are demonstrated by injection of latex beads. The most important morphological findings are: the controversial hyponeural circulation is haemal and not coelomic; peritoneal ciliation is general and not limited to the cells of the ciliated pits; and occur smooth muscle cells occur below the peritoneum. Carmine particles injected into the central body coelom rapidly travel outward toward the arm and pinnule tips via the aboral canals; the particles return to the central body via the subtentacular canals. Latex beads injected intracoelomically are taken up by peritoneal cells throughout the subtentacular, genital and aboral canals. The possible functions of the haemal and coelomic circulatory systems of crinoids are discussed.

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Authors and Affiliations

  1. Earth and Space Sciences, University of California at Los Angeles, 90024, Los Angeles, California, USA

    John C. Grimmer

  2. Division of Marine Biology, A-008, Scripps Institution of Oceanography, 92093, La Jolla, California, USA

    Nicholas D. Holland

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  1. John C. Grimmer
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  2. Nicholas D. Holland
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Grimmer, J.C., Holland, N.D. Haemal and coelomic circulatory systems in the arms and pinnules ofFlorometra serratissima (Echinodermata: Crinoidea). Zoomorphologie 94, 93–109 (1979). https://doi.org/10.1007/BF00994059

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  • DOI: https://doi.org/10.1007/BF00994059

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