TY - JOUR AU - Östman, Carina AU - Roat Kultima, Jens AU - Grace Wong, Sau Yu PY - 2010/09/30 Y2 - 2024/03/28 TI - Dart formation in nematocysts of the sea anemone Metridium senile (Linnaeus, 1761) (Cnidaria: Anthozoa) JF - Scientia Marina JA - Sci. mar. VL - 74 IS - 3 SE - Articles DO - 10.3989/scimar.2010.74n3499 UR - https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1178 SP - 499-510 AB - In examining large acontia b-mastigophore and p-amastigophore nematocysts of the sea anemone <i>Metridium senile</i> (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. ER -