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Nematocysts of the Medusa Stage of Rhopilema verrilli (Scyphozoa, Rhizostomeae)

Dale R. Calder
Transactions of the American Microscopical Society
Vol. 91, No. 2 (Apr., 1972), pp. 213-216
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3225411
Stable URL: http://www.jstor.org/stable/3225411
Page Count: 4
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Nematocysts of the Medusa Stage of Rhopilema verrilli (Scyphozoa, Rhizostomeae)
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Abstract

Nematocysts were examined in six specimens of the rare scyphomedusa Rhopilema verrilli. Three categories of nematocysts were identified: Atrichous isorhizas of the small (5.3-6.9 x 3.3-4.5 µ) "a" atrich variety, holotrichous haplonemes (6.9-8.9 x 5.4-7.4 µ), and microbasic heterotrichous euryteles (7.6-10.1 x 5.0-7.1 µ). In possessing holotrichs, R. verrilli differs from the closely related medusa Rhizostoma pulmo. No sting was detectable following contact with medusae of R. verrilli, and the species is regarded as nonvenomous to man.

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