Scientia Marina, Vol 74, No 3 (2010)

Dart formation in nematocysts of the sea anemone Metridium senile (Linnaeus, 1761) (Cnidaria: Anthozoa)


https://doi.org/10.3989/scimar.2010.74n3499

Carina Östman
Animal Development and Genetics, Evolutionary Biology Centre (EBC), Uppsala University , Sweden

Jens Roat Kultima
Uppsala University , Sweden

Sau Yu Grace Wong
School of Animal and Microbial Sciences, University of Reading , United Kingdom

Abstract


In examining large acontia b-mastigophore and p-amastigophore nematocysts of the sea anemone Metridium senile (Linnaeus, 1761) darts were observed by interference-contrast light microscopy (LM) and scanning electron microscopy (SEM). The darts consist of closely packed spines detached from the shafts, still in three helical rows. Their spines form a hollow cylinder with a sharp tip and indented base, its width similar to that of an undischarged shaft but varying in length. b-mastigophore darts were more common than those of p-mastigophores and many were longer.

Keywords


nematocysts; cnidae; sea anemones; darts; SEM

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