. The biology of the Protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 255 or girdle around the cell, giving the impression of an annular row of cilia which led to the earlier name Cilioflagellata for the group (Fig. 70, p. 13()). ^Multiple flagella are characteristic of the Poly- mastigida and H\'permastigida. Nuclei for the most part are simple vesicular and endosome-bear- ing nuclei, but there are wide variations in complexity so that a general description is quite inadequate (see p. 56). Chromatophores and Stigmata.—Chromatophores are the most characteristic of the plas
. The biology of the Protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 255 or girdle around the cell, giving the impression of an annular row of cilia which led to the earlier name Cilioflagellata for the group (Fig. 70, p. 13()). ^Multiple flagella are characteristic of the Poly- mastigida and H\'permastigida. Nuclei for the most part are simple vesicular and endosome-bear- ing nuclei, but there are wide variations in complexity so that a general description is quite inadequate (see p. 56). Chromatophores and Stigmata.—Chromatophores are the most characteristic of the plastids in this group. While usually present as definite bodies of characteristic size and shape, they are sometimes in the form of a vague network (Fig. 124), or as irregular clumps of chlorophyll-holding substances (Chrysomonadida, Tryptomonadida). More often, however, they are definitely formed bodies, discoidal, cup-shape, band-, star-, or rod-form. Their colors vary from yellow. A B C D Fig. 124.—Flagellates with chlorophyll iu a reticulated network. .4, B, Chrynapsis sagene; C, D, Chrysapsis fcncstrata. (After Pascher). and brown (Chrysomonadida, Cryptomonadida, Dinoflagellida) to a bright green in the Phytomonadida, while blue-green and red are occasionally seen. In all cases the basic color is chlorophyll-green, varying in shade as it does in the higher plants; this is often masked by overlying colors which in all cases are readily dissolved out by alcohol, thus exposing the typical green. Many of the chloroph\'lI-bearing flagellates and a few colorless ones (Astasiidae) possess a minute rod-shape, oval or discoidal mass of red pigmented oily (lipochrome) substance called the stigma or "eye-spot," which is usually situated in the anterior end. According to Fran9e, it may be accompanied by one or more paramylum bodies which function as a lens system. Following Engelmann the stigma is generally interpreted as a bit of protoplasm particularly sensitive to light
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