, Volume 334, Issue 1–3, pp 241–249 | Cite as

Peripheral vascular apparatus in some aquatic oligochaetes with special references to haplotaxids

  • Roberto Valvassori
  • Magda de Eguileor
  • Annalisa Grimaldi
  • Laura Colombo
Histology and ultrastructure


The organization of the peripheral vascular apparatus in two haplotaxids has been studied and compared with that of other microdriles. Considerable differences in the circulatory systems of Pelodrilus leruthi and Haplotaxis gordioides, especially in relationships to the body wall muscle fibers, separate and distinguish the two animals. Different organizations of the peripheral apparatus that can be observed in these microdriles are: in the first species, capillary vessels have no contact with the body wall; in the second species, capillaries extend between the longitudinal muscle fibers until they reach the body surface, thus approaching the situation in megadriles where circulation can become intraepithelial.

Generally, vessels hanging in the coelom are of a large diameter. When a capillary network related to the body wall muscle develops, vessels are small in diameter and their walls have variable numbers of contractile elements, ensuring the forced circulation of the blood.

Key words

Haplotaxidae vessels ultrastructure microdriles 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Roberto Valvassori
    • 2
  • Magda de Eguileor
    • 1
  • Annalisa Grimaldi
    • 1
  • Laura Colombo
    • 2
  1. 1.III Facoltà di ScienzeUniversità di MilanoVareseItaly
  2. 2.Dipartimento di BiologiaUniversità di MilanoMilanoItaly

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