NDLI: Ultrastructure of the digestive system and experimental study of feeding in the monogenean skin and fin parasite Macrogyrodactylus congolensis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Arafa, Safaa Z. El-Naggar, Mohammed M. Kearn, Graham C.
Description	Author Affiliation: Arafa SZ ( Zoology Department, Faculty of Sciences, Mansoura University, Mansoura, Egypt, safaa19@hotmail.com.)
Abstract	In the present study, transmission electron microscopy (TEM) has been used to study the ultrastructure of the digestive system, namely the pharynx, oesophageal glands and intestine, of the monogenean skin and fin parasite Macrogyrodactylus congolensis. The pharynx consists of an anterior highly muscular region and a posterior mainly glandular syncytial region. The anterior region is provided with six pharyngeal papillae, the centre of each of which is occupied by electron dense secretory bodies, identical with those in the posterior region of the pharynx. The intestine has an uninterrupted syncytial gastrodermis and the luminal surface is provided with many unbranched lamellae. The intestine of living specimens contains large and small granules which give it a reddish brown colour. Large particles, presumed to be lipid droplets, and small granules, presumed to be melanin granules, were found in the gastrodermis and in the intestinal lumen. Parasites were induced to feed and then preserved for TEM at the following intervals: just after feeding, 30 min after feeding, 1 h 30 min after feeding and 2 h after feeding. The specimens were then processed for TEM and sections cut through the intestine of each specimen were examined with the transmission electron microscope. Three types of vacuoles (V1, V2, V3) were detected in the gastrodermis. Vacuoles V1 have thick walls and are likely to be endocytotic, enclosing luminal contents at the surface of the gastrodermis. V2 vacuoles may be lysosomes that fuse with V1 vacuoles. V3 vacuoles may serve to dispose of residual digestive material into the lumen.
File Format	HTM / HTML
ISSN	12302821
Issue Number	4
Journal	Acta Parasitologica
Volume Number	58
e-ISSN	18961851
Language	English
Publisher	De Gruyter
Publisher Date	2013-12-01
Publisher Place	Poland
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Parasitology Platyhelminths Physiology Ultrastructure Animals Digestive System Feeding Behavior Microscopy, Electron, Transmission Journal Article
Content Type	Text
Resource Type	Article
Subject	Parasitology

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