Ultrastructural properties of the Theromyzon (Annelida: Hirudinae) cocoon membrane

  • Dimitriu C
  • Shain D
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The cocoon of the leech Theromyzon trizonare consists of fibrils packed into an arrangement that produces both C- and S-like patterns of bow-shaped lines in sections oblique through the membrane. Sections normal to the cocoon membrane show layers containing cross-sections of fibrils (approximately 16 nm dia.) that are separated by a center-to-center distance of approximately 23 nm. In cross-section, each fibril presents a central hole approximately 5 nm in diameter. A structureless layer covers most of the exterior surface of the cocoon membrane, and short protuberances are apparent in some zones. © 2004 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Cocoon
  • Fibril
  • Leech
  • Membrane
  • Theromyzon
  • Transmission electron microscopy
  • Ultrastructure

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  • Corneliu Dimitriu

  • Daniel H. Shain

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