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Abstract
Octodrilus complanatus (Lumbricidae) is a relatively large earthworm species widespread in the Hellenic territory and beyond. The main objective of our study was the histological description of O. complanatus and the determination of collagen distribution in its tissues. The histological study was carried out by means of hematoxylineosin staining in paraffin sections. The distribution of collagen was examined by histochemical techniques: CAB and Trichrom masson. The paraffin sections were examined by a light microscope after staining and the internal organs of the earthworm (alimentary canal, nervous, excretory, circulatory, and reproductive systems) were described. Most of the collagen was found in the cuticle, in the muscles under the epidermis and in the nervous system.