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- W2076062893 abstract "Cnidocysts have been examined from the tentacles of the ctenophore Haeckelia rubra (Euchlora rubra) and five species of hydrozoan narcomedusae (Solmundella bitentaculata, Aegina citrea, Solmissus marshalli, Solmissus albescens, and Cunina sp.) using TEM, both in sections and by firing whole cnidocysts onto EM grids. The study revealed that these apotrichous isorhiza cnidocysts have a novel morphology in which the intracapsular inverted tubule has five circumferential pleats when viewed in transverse section, rather than the usual three pleats. Accordingly, the definition of helicoptychoneme cnidocysts has been broadened to include both the usual three-pleated cnidocysts and these new five-pleated cnidocysts. In general, apotrichous isorhizas have subspherical capsules with a thick, bilayered wall, whose interior is nearly filled with the regularly coiled, helically folded, five-pleated inverted tubule. Upon discharge, the everted tubule is several mm long and the five circumferential pleats become manifested as five helical rows of spines running up the tubule, which has three morphologically different segments. The very short basal segment is devoid of ornamentation; the remaining proximal portion is characterized by five spirals of uniform, closely packed short spines; the long distal portion is characterized by a single spiral of regularly spaced large spines that derive from all five spirals-the five spirals are otherwise demarcated in the distal portion by 'scales' that are visible only with the electron microscope." @default.
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- W2076062893 date "1989-01-01" @default.
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- W2076062893 title "Novel cnidocysts of narcomedusae and a medusivorous ctenophore, and confirmation of kleptocnidism" @default.
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- W2076062893 doi "https://doi.org/10.1016/0040-8166(89)90081-5" @default.
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