NDLI: Morphology and ultrastructure of the midgut in Piscicola geometra (Annelida, Hirudinea)

Content Provider	Springer Nature Link
Author	Rost Roszkowska, Magdalena M. Świątek, Piotr Kszuk, Michalina Główczyk, Kinga Bielecki, Aleksander
Copyright Year	2011
Abstract	This paper presents information on the organization of the midgut and its epithelium ultrastructure in juvenile and adult specimens of Piscicola geometra (Annelida, Hirudinea), a species which is a widespread ectoparasite found on the body and gills and in the mouth of many types of fish. The analysis of juvenile nonfeeding specimens helped in the explanation of all alterations in the midgut epithelium which are connected with digestion. The endodermal portion (midgut) of the digestive system is composed of four regions: the esophagus, the crop, the posterior crop caecum, and the intestine. Their epithelia are formed by flat, cuboidal, or columnar digestive cells; however, single small cells which do not contact the midgut lumen were also observed. The ultrastructure of all of the regions of the midgut are described and discussed with a special emphasis on their functions in the digestion of blood. In P. geometra, the part of the midgut that is devoid of microvilli is responsible for the accumulation of blood, while the epithelium of the remaining part of the midgut, which has a distinct regionalization in the distribution of organelles, plays a role in its absorption and secretion. Glycogen granules in the intestinal epithelium indicate its role in the accumulation of sugar. The comparison of the ultrastructure of midgut epithelium in juvenile and adult specimens suggests that electron-dense granules observed in the apical cytoplasm of digestive cells take part in enzyme accumulation. Numerous microorganisms were observed in the mycetome, which is composed of two large oval diverticles that connect with the esophagus via thin ducts. Similar microorganisms also occurred in the cytoplasm of the epithelium in the esophagus, the crop, the intestine, and in their lumen. Microorganisms were observed both in fed adult and unfed juvenile specimens of P. geometra, which strongly suggests that vertical transmission occurs from parent to offspring.
Starting Page	1037
Ending Page	1047
Page Count	11
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	249
Issue Number	4
e-ISSN	16156102
Language	English
Publisher	Springer Vienna
Publisher Date	2011-10-21
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Leeches Midgut epithelium Digestive system Haem digestion Endosymbionts Plant Sciences Zoology Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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