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Cyrtos ultrastructure in <em>Zosterograptus</em> sp.

Cyrtos ultrastructure in Zosterograptus sp.. Cytoskeletal microarchitecture in Zosterograptus sp. showing microtubules used for feeding. The cytopharyngeal feeding basket is a circular arrangement of wedge-shaped nematodesmata composed of about 25,000 hexagonally packed microtubules. Cross section imaged by TEM at Georgetown University.