Ultrastructure of the digestive tract of Gyliauchen nahaensis (Platyhelminthes, Digenea), an inhabitant of the hindgut of herbivorous fishes

Jones, Malcolm K., Hughes-Stamm, Sheree R., East, Renae M. and Cribb, Thomas H. (2000) Ultrastructure of the digestive tract of Gyliauchen nahaensis (Platyhelminthes, Digenea), an inhabitant of the hindgut of herbivorous fishes. Journal of Morphology, 246 3: 198-211. doi:10.1002/1097-4687(200012)246:3<198::AID-JMOR4>3.0.CO;2-2


Author Jones, Malcolm K.
Hughes-Stamm, Sheree R.
East, Renae M.
Cribb, Thomas H.
Title Ultrastructure of the digestive tract of Gyliauchen nahaensis (Platyhelminthes, Digenea), an inhabitant of the hindgut of herbivorous fishes
Journal name Journal of Morphology   Check publisher's open access policy
ISSN 0362-2525
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.1002/1097-4687(200012)246:3<198::AID-JMOR4>3.0.CO;2-2
Volume 246
Issue 3
Start page 198
End page 211
Total pages 14
Place of publication New York
Publisher Wiley-Liss
Collection year 2000
Language eng
Subject C1
300508 Parasitology
780105 Biological sciences
Abstract Digenean parasites of vertebrates usually amplify the surface area of their gut by increasing the size of the absorptive caeca. Some members of the family Gyliauchenidae, however, have relatively small caeca but have a greatly expanded foregut. The morphology of the elongate gut of the digenean Gyliauchen nahaensis, an inhabitant of herbivorous fish of the family Siganidae, was examined by light and transmission electron microscopy. The extensive foregut, consisting of a mouth, pharynx, and esophagus, is lined with a syncytial tegument-like lining, which is connected to nucleated cell bodies sunken in the parenchyma. The apical cytoplasm in the mouth and anterior regions of the pharynx resembles that of the general body tegument, although some regional specialization is present. The lining of posterior regions of the pharynx is armed with large apical projections, which are thought to serve as filtration structures. The lining of the anterior and middle esophagus displays a peculiar form of surface amplification involving the formation of elongate flask-shaped invaginations of the apical cytoplasm. The cell bodies associated with these regions are rich in secretory vesicles and it is proposed that these regions of the esophagus are expanded to promote extracellular digestion. The posterior region of the esophagus lacks the invaginations of other esophageal regions, but displays instead large surface projections. The caeca consists of columnar cells lined by extensive apical microlamellae. The peculiar gut morphology of G. nahaensis, coupled with alterations in the arrangement of suckers, is interpreted to be an adaptation to the predominantly herbivorous diets of the definitive hosts. (C) 2000 Wiley-Liss, Inc.
Keyword Anatomy & Morphology
Digenea
Ultrastructure
Digestive System
Gyliauchen
Siganidae
Gastrodermis
Epithelia
Sanguinicola-inermis
Paramphistomidae
Foregut
Marine
System
Glands
Actin
Gut
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Tue, 10 Jun 2008, 20:32:07 EST