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Epidermal mucus and the reproduction of a crinoid echinoderm (1975)

HOLLAND, NICHOLAS D. ; GRIMMER, JOHN C.

[s.l.] : Nature Publishing Group

Nature 255 (1975), S. 223-224

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] In both sexes the volume of the epidermal mucous cell population increases conspicuously in the weeks before spawn ing (Fig. 2). In the female (Fig. 20) this increase is about ten times as great as in the male (Fig. 2b). The volume of the mucous cell population decreases markedly around the time of ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/255223a0

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Haemal and coelomic circulatory systems in the arms and pinnules ofFlorometra serratissima (Echinodermata: Crinoidea) (1979)

Grimmer, John C. ; Holland, Nicholas D.

Springer

Zoomorphology 94 (1979), S. 93-109

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ISSN: 1432-234X

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: 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.