. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION—TAXONOMIC STRUCTURES 161 movement (Aspidisca); others combine swimming due to the adoral zone with sudden jumps or springs due to the anal or caudal cirri (Uronychia, Euplotes, etc.). Such saltations are not limited to the Hypotrichida, however, but are characteristic of organisms in all groups where cirri are developed as in Halteria grandinella among Oligotrichida, Mesodinium cinetum among Holotrichida, etc. In some cases cirri are differentiated as tactile organs, especially the more dorsal ones of certain Hypotrichida.
. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION—TAXONOMIC STRUCTURES 161 movement (Aspidisca); others combine swimming due to the adoral zone with sudden jumps or springs due to the anal or caudal cirri (Uronychia, Euplotes, etc.). Such saltations are not limited to the Hypotrichida, however, but are characteristic of organisms in all groups where cirri are developed as in Halteria grandinella among Oligotrichida, Mesodinium cinetum among Holotrichida, etc. In some cases cirri are differentiated as tactile organs, especially the more dorsal ones of certain Hypotrichida. It is probable that such cirri are no different from other motile organs of the ciliates in this respect, extreme irritability being a common characteristic. Few observers can have failed to note the instantaneous effect of a slight local irritation on a quietly resting Pleuronema chrysalis, for example, with its long cilia radiating out in all directions, yet there are no cirri 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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