. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 318 THE BIOLOGY OF HYDRA : 1961. Fig. 1. High-speed photograph of a swimming medusa. Magnification approximately 3X. 4) a basal region by which it attaches to the substrate and/or to neighboring hydranths. These hydranths carry on asexual reproduction by producing three types of buds (Fig. 3): 1) hydranth buds which remain attached to the parent to form small colonies; 2) frustule or planu- loid buds which separate from the parent and creep a short dis- tance before developing into new p
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 318 THE BIOLOGY OF HYDRA : 1961. Fig. 1. High-speed photograph of a swimming medusa. Magnification approximately 3X. 4) a basal region by which it attaches to the substrate and/or to neighboring hydranths. These hydranths carry on asexual reproduction by producing three types of buds (Fig. 3): 1) hydranth buds which remain attached to the parent to form small colonies; 2) frustule or planu- loid buds which separate from the parent and creep a short dis- tance before developing into new polyps; and 3) medusoid buds which are released as free-swimming medusae. Under optimal conditions all three types of buds are formed laterally as outgrowths of the body wall near the middle or budding region of the hy- dranth {vide ref. 21). Differential growth in the case of hydranth buds results in the subsequent basal attachment of adjacent hy- dranths. Several previous workers have observed the budding processes of Craspedacusta polyps (3, 6-10, 12, 14-22), but only Reisinger (20, 21) and McClary (14) have studied specific factors which influence the production of buds under laboratory conditions. Reisinger (20, 21) found that a sudden elevation of tempera- ture from 20" to 25-27° could initiate medusa budding. Mc- Clary (14) studied the growth and reproduction of polyps at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on the Physiology and Ultrastructure of Hydra and Some Other Coelenterates (1961 : Coral Gables, Fla. ); Lenhoff, Howard M; Loomis, W. Farnsworth (William Farnsworth), 1914-. Coral Gables, Fla. , University of Miami Press
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