Structure and Operation of the Feeding Apparatus in a Colorless Euglenoid,Entosiphon sulcatum1
作者:
RICHARD E. TRIEMER,
LAWRENCE FRITZ,
期刊:
The Journal of Protozoology
(WILEY Available online 1987)
卷期:
Volume 34,
issue 1
页码: 39-47
ISSN:0022-3921
年代: 1987
DOI:10.1111/j.1550-7408.1987.tb03129.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
ABSTRACTEntosiphon sulcatumis a phagotrophic euglenoid. The tubular ingestion apparatus, called a siphon, is composed of three microtubular rods extending the length of the cell. Within the tube are four large striated vanes arranged much like the blades in a pinwheel. The vanes arise from the microtubular rods and curve towards the center of the feeding apparatus. Sheets of endoplasmic reticulum are positioned adjacent to each of the vanes and surround the perimeter of the apparatus. A cap, supported by a scaffold and anchored into the cytoplasm, covers the opening of the siphon. An elongate invagination of the plasma membrane is positioned adjacent to the edge of the cap and extends downward into the siphon forming the opening. The vanes converge at the anterior end of the siphon and surround the invagination. During feeding, the siphon protrudes from the cell. As the apparatus protrudes the cap is withdrawn to the side, opening the siphon. The vanes spread apart expanding the invagination of the plasma membrane into a large cavity into which ingested food particles are taken.
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