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The Hydroids and Medusae Sarsia Occulta Sp.Nov., Sarsia Tubulosa and Sarsia Loveni

Published online by Cambridge University Press:  11 May 2009

C. Edwards
C. Edwards
Affiliation:
Dunstaffnage Marine Research Laboratory, Oban, Scotland
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Extract

The discovery of a new species of Sarsia hydroid and its medusa and a comparison of this species with Sarsia tubulosa (M. Sars) and S. loveni (M. Sars) have resolved a longstanding problem. In his detailed account of the hydroid and medusa Coryne mirabilis (now accepted as identical and synonymous with Sarsia tubulosa), Louis Agassiz (1860-2, vol. 4, pp. 189-90, 203-4, P's- 17J i8) asserted that it undergoes a change of reproduction in winter and spring. He stated that in late winter the hydroid releases medusae but that in spring the gonophores no longer develop into normal medusae, being retained on the hydranths where they become sexually mature without mouth and tentacles. He based his conclusions on a series of hydroid colonies collected on the shore. Allman (1871-2, pp. 278-9) was strongly disinclined to accept Agassiz's assertion of the specific identity of the two forms of gonophore without stronger evidence, saying that, until the two kinds were found simultaneously or in succession on one colony kept under close observation in an aquarium, the identity of the two forms could not be accepted as proved. Mayer (1910, p. 55), from personal observation of colonies collected on the coast of Massachusetts, came to the same conclusion as Agassiz, but he did not say whether he had followed the succession in an aquarium or had observed one colony throughout, and accordingly his conclusion is subject to the same criticism.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 58 , Issue 2 , May 1978 , pp. 291 - 311
Copyright
Copyright © Marine Biological Association of the United Kingdom 1978

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References

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