. The biology of the Protozoa. Protozoa; Protozoa. 204 BIOLOGY OF THE PROTOZOA of a simple skeleton of silica in the form of a ring {Mesocena, Lemm.) or of a ring with bars. Distei), Ehr, is associated with Radiolaria as a parasite or a symbiont. It has a single flagellum, yellow chromatophores and a fenestrated silicious skeleton. Little is known about its life history and at one time it was supposed to be a stage in the development of certain forms of Radiolaria (Fig. 128).. A B Fig. 128. -Distephanus sTpeculum, side {A) and top (S) views of skeleton. Calkins after Borgert.) (F
. The biology of the Protozoa. Protozoa; Protozoa. 204 BIOLOGY OF THE PROTOZOA of a simple skeleton of silica in the form of a ring {Mesocena, Lemm.) or of a ring with bars. Distei), Ehr, is associated with Radiolaria as a parasite or a symbiont. It has a single flagellum, yellow chromatophores and a fenestrated silicious skeleton. Little is known about its life history and at one time it was supposed to be a stage in the development of certain forms of Radiolaria (Fig. 128).. A B Fig. 128. -Distephanus sTpeculum, side {A) and top (S) views of skeleton. Calkins after Borgert.) (From Sub-order 2. Rhizochrysidina, Pascher. A highly artificial group consisting of genera in which no flagella have been described but which move by means of pseudopodia. The temporary nature of the group is indicated by the fact that as soon as a flagellum is observed in any member of the sub-division, that species becomes one of the Euchrysomonadina. It is retained in the classification merely for convenience in holding pseudopodia- bearing forms with yellow chromatophores and no flagella. The genera Rhizochrysis, Chrysidiastrum and Chrysostephanosphaera are naked, while Stylococcus and Lagynion are test-dwelling with long, thread-like, often single, pseudopodia. Sub-order 3. Chrysocapsina, Pascher. While Palmella stages are characteristic of all the Chrysomonadida in this group they become the prevailing stage and flagellated forms are transitory. Here the individuals are enclosed in a gelatinous. 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, New York, Lea & Febiger
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