STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Climacostomum protozoan. Coloured scanning electron micrograph (SEM) of a Climacostomum sp. unicellular ciliate protozoan, showing the cell's large oral apparatus (round, centre). This structure features an adoral zone of membranelles (AZM) partly encircling a wide buccal cavity (mouth), which opens into the cytopharyngeal pouch. Magnification: x400 when printed 10 centimetres wide.
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