Electron Micrographs of the Nematocysts of Hydra

Authors

Marietta Issidorides, State University of Iowa
H. W. Beams, State University of IowaFollow
A. W. Sedar, State University of Iowa
T. C. Evans, State University of IowaFollow

Document Type

Research

Abstract

Seventeen different kinds of nematocysts have been described and classified by Weill (1930) on the basis of the characteristics of the discharged tube. Only four of these are known to be present on hydras, namely, volvents (desmonemes), streptoline glutinants (holotrichous isorhizas), stereoline glutinants (atrichous isorhizes), and penetrants (stenoteles). The discharged penetrant (fig. 1) consists of the capsule a, butt, which is composed of the shaft b, stylet c, spinneret d, and tube e. In the glutinants the tube is attached directly to the tube, and is either spiny (streptoline glutinant) or smooth (stereoline glutinant). In the resting nematocyst all the component parts are inverted and contained within the capsule.

Publication Date

1952

Journal Title

Proceedings of the Iowa Academy of Science

Volume

59

Issue

1

First Page

461

Last Page

466

Copyright

©1952 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Issidorides, Marietta; Beams, H. W.; Sedar, A. W.; and Evans, T. C. (1952) "Electron Micrographs of the Nematocysts of Hydra," Proceedings of the Iowa Academy of Science, 59(1), 461-466.
Available at: https://scholarworks.uni.edu/pias/vol59/iss1/68