. The biology of the protozoa. Protozoa; Protozoa. 120 BIOLOGY OF THE PROTOZOA aster consisting of centrosomes, centrodesmose and astral rays made up of the radiating fibrils (Fig. 50, p. 95 — see also Trichonympha cam- panula) . Stern (1914), however, found that mitotic spindles may arise in Acanthocystis without any connection with the central granule (Fig. 67). The central grain, however, takes no part in reproduction by bud- ding, whereby ameboid or flagellated buds are formed which contain a nucleus derived from the parent cell nucleus, but no central grain. This nucleus, however, contain
. The biology of the protozoa. Protozoa; Protozoa. 120 BIOLOGY OF THE PROTOZOA aster consisting of centrosomes, centrodesmose and astral rays made up of the radiating fibrils (Fig. 50, p. 95 — see also Trichonympha cam- panula) . Stern (1914), however, found that mitotic spindles may arise in Acanthocystis without any connection with the central granule (Fig. 67). The central grain, however, takes no part in reproduction by bud- ding, whereby ameboid or flagellated buds are formed which contain a nucleus derived from the parent cell nucleus, but no central grain. This nucleus, however, contains an endobasal body which divides and one of the daughter granules emerges from the nucleus as it does in Dimastigamoeba gruberi (p. 34), but retains its eentrodes- mose for some time and ultimately forms the central grain of the. Fig. 66.—Relation of axial filaments to nuclei. Section of Actinophrys sol with axial filaments arising from intranuclear granules in recently divided nuclei. (After Schaudinn.) adult organism (Schaudinn, 1896; Zuelzer, 1909; Acanthocystis acu- leata, Wag nerd I a borealis, Fig. 50). Similarity with the centrobleph- aroplast in flagellates is thus shown (1) by its origin from an intranuclear centriole; (2) by its relation to axial filaments which are homologous with rhizoplasts; (3) by its history during mitosis. The analogy is further strengthened by its relation to the flagella and to the axopodia which are simultaneously present in some of the Helio- flagellida {Actinomonas mirabilis, Kent, Ciliophrys marina, Caullery, and Dimorpha mtitans, Gruber). In Dimorpha mutans (Fig. 13, p. 34), the central grain lies near one pole of the cell where it forms the basal body of the two flagella as well as the focal point for the axial filaments; here flagella and axial filaments appear to be homologous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
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