Summary
Cytological and cytochemical studies were undertaken on hydranths of the gymnoblastic hydroid, Pennaria tiarella and compared with conditions in the more abundantly studied but less typical genus, Hydra. The histological organization of Pennaria was more complex than in Hydra. This was particularly noted in: the regional organization of the endoderm into a pharynx, digestive region, and basal region; in the enhanced role of the epitheliomusculature in binding the endodermal epithelium to the mesolammella; and in the presence of two types of tentacles. The most striking cellular specialization was a much enlarged secretory cell in the digestive region which exhibited high levels of cytoplasmic and nucleolar RNA and protein. Current notions concerning form maintenance in coelenterates were discussed in connection with observations on nematocyst replacement and gonophore development in Pennaria.
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This work was supported by grants from the National Institutes of Health (RG-10003-02) and the National Science Foundation (G-18666), as well as a research career award (5-K3-HD-6176-02) from the National Institute of Child Health and Human Development.
Contribution number 357 of the Bermuda Biological Station.
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Cowden, R.R. A cytological and cytochemical study of hydranths of the hydroid coelenterate, Pennaria tiarella . Zeitschrift für Zellforschung 65, 869–883 (1965). https://doi.org/10.1007/BF00319306
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DOI: https://doi.org/10.1007/BF00319306