. The biology of the protozoa. Protozoa; Protozoa. 412 BIOLOGY OF THE PROTOZOA sub-phyla treated, while the keys to genera are entirely recast. An important change is the omission here of all groups of chlorophyll- hearing forms. Beginning with Pascher (1914) these were classified as Algae, and they find a much more logical position as branches of the botanical Stammbaum than they have in any protozoan rela- tionship. As Protista or as Protophyta they have their unques- tioned place, but as Protozoa they are anomalous (see also p. IS). Diesing's term Mastigophora referred primarily to plant fl
. The biology of the protozoa. Protozoa; Protozoa. 412 BIOLOGY OF THE PROTOZOA sub-phyla treated, while the keys to genera are entirely recast. An important change is the omission here of all groups of chlorophyll- hearing forms. Beginning with Pascher (1914) these were classified as Algae, and they find a much more logical position as branches of the botanical Stammbaum than they have in any protozoan rela- tionship. As Protista or as Protophyta they have their unques- tioned place, but as Protozoa they are anomalous (see also p. IS). Diesing's term Mastigophora referred primarily to plant flagellates and a new term should be provided for animal flagellates; I suggest the sub-phylum Fig. 174. — Types of Rhizomastigidae. A, Mastigamoeba aspera. B, Actinomonas mi nihil is; f, flagella; /), pseudopodia. (From Calkins after F. E. Schultze and Sav. Kent.) The only common characteristics of this group of Protozoa are the possession of one or more vibratile motile elements in the form of flagella, and reproduction by longitudinal division. In other respects they differ widely in: (a) Complexity of organization, axial relations, symmetry and body form; and (b) distribution and mode of life. Organization.—Many of the flagellates are simple ellipsoidal mon- axonic organisms with a single flagellum at the anterior end (Pro- tomonads); others are ameboid (Pantastomatida, Fig. 174); some are bilaterally symmetrical (Diplozoic forms); some spherical (Actinomonas, etc.) and some are spirally twisted (Holomastigo- tidae, etc.). While flagella are for the most part all similar in finer structure. 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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