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Cnidae in the sea anemone Sagartiogeton viduatus (Muller, 1776) (Cnidaria, Anthozoa); A comparison to cnidae in the sea anemone Metridium senile (Linnaeus, 1761) (Cnidaria, Anthozoa)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
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2013 (English)In: Acta Zoologica (Stockholm), ISSN 0001-7272, E-ISSN 1463-6395, Vol. 94, no 4, 392-409 p.Article in journal (Refereed) Published
Abstract [en]

The cnidom of the sea anemone Sagartiogeton viduatus (Muller, 1776) is described from interference-contrast light micrographs (LMs) and scanning electron micrographs (SEMs). Special attention is given to nematocyst maturation, including the differentiation of the shaft into proximal and main regions as helical folding of the shaft wall proceeds. Comparisons are made with Metridium senile (Linnaeus, 1761), whose cnidom, with a few exceptions, is closely similar to that of S.viduatus. The two anemones possess b- and p-mastigophores, p-amastigophores, isorhizas and spirocysts. Although the majority of cnidae in S.viduatus is smaller than corresponding ones in M.senile, they are grouped into the same size classes as those of M.senile, namely small, medium and large. The main differences from M.senile cnidae are the followings: (1) Large acontia p-amastigophores are the largest nematocysts in S.viduatus. (2) They are noticeably larger than the large acontia b-mastigophores, and (3) they are separated from the p-amastigophores of M.senile by the sinusoid pattern of their U-shaped capsular matrix. (4) The large acontia b-mastigophores are microbasic and not mesobasic as in M.Senile, and (5) they do not produce darts. (6) Another difference from M.senile is the absence of catch-tentacle isorhizas.

Place, publisher, year, edition, pages
2013. Vol. 94, no 4, 392-409 p.
Keyword [en]
Nematocysts, cnidae, sea anemone, scanning electron micrograph
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-211027DOI: 10.1111/j.1463-6395.2012.00567.xISI: 000324922500003OAI: oai:DiVA.org:uu-211027DiVA: diva2:665339
Available from: 2013-11-19 Created: 2013-11-19 Last updated: 2013-11-19Bibliographically approved

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