. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION—TAXONOMIC STRUCTURES 169 separate an anterior frontal field from the remainder of the body, as seems to be the case in Climacostommn virens (Fig. 71, p. 128). With the development of an attaching portion of the body as in Stentor, and in the interest of feeding, such a frontal field becomes directed upward, reaching its most perfect development in types like Vorticella and its allies (Fig. 86, p. 158).. Fig. 94.—A, Bursaria truncatella, frontal field deeply insunk; B^Folliculina ampulla, with frontal field drawn out into t
. The biology of the protozoa. Protozoa; Protozoa. DERIVED ORGANIZATION—TAXONOMIC STRUCTURES 169 separate an anterior frontal field from the remainder of the body, as seems to be the case in Climacostommn virens (Fig. 71, p. 128). With the development of an attaching portion of the body as in Stentor, and in the interest of feeding, such a frontal field becomes directed upward, reaching its most perfect development in types like Vorticella and its allies (Fig. 86, p. 158).. Fig. 94.—A, Bursaria truncatella, frontal field deeply insunk; B^Folliculina ampulla, with frontal field drawn out into two flexible arms. (.4, original; B, after Doflein.) Such frontal fields are flat in the various species of Stentor, or they may be greatly invaginated as in Bursaria truncatella, or drawn out into two ciliated food-getting arms as in Folliculina ampulla (Fig. 94), or into a tripartite frontal field in Triloba paradoxa, or rolled up folds as in Bursalinus synspiralis. The cytoproct is rarely differentiated as a definite opening in the cortex. In many cases, especially in the flagellate group, the cyto- pharynx and anus are the same. In the majority of ciliates, on the other hand, there is a constant opening or pore, usually in the pos-. 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
Size: 1491px × 1675px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthor, bookcentury1900, bookpublisherphiladelphialeafebiger
