Ultrastructure of the gastrodermis and posterior gut pockets of Concinnocotyla australensis (Platyhelminthes, Monogenea, Polystomatidae) and comparison with another polystomatid, Neopolystoma spratti

Title:

Ultrastructure of the gastrodermis and posterior gut pockets of Concinnocotyla australensis (Platyhelminthes, Monogenea, Polystomatidae) and comparison with another polystomatid, Neopolystoma spratti

Creator:

Watson, Nikki A. and Whittington, Ian D.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4de9270c-c2af-45b2-a1e3-b3b49842f67a
uuid:4de9270c-c2af-45b2-a1e3-b3b49842f67a
urnnbn:urn:nbn:cz:aba007-000dm9

Subject:

gastrodermis, ultrastructure, Polystomatidae, and Platyhelminthes

Type:

model:internalpart and TEXT

Format:

print

Description:

While the majority of polyopisthocotylean monogeneans feed on blood, some polystomatids infecting chelonians do not. This study examined the gastrodermis of two polystomatids, one - Neopolystoma spratti Pichelin, 1995 - from the conjunctival sac of a chelonian and the other - Concinnocotyla australensis (Reichenbach-Klinke, 1966) - from the oral cavity, gill arches and primary gill lamellae of a fish, and also found no evidence of blood feeding. However, the gastrodermal architecture in both species basically resembles that found in blood feeding polyopisthocotyleans, with alternation of lamellated digestive cells and an intervening syncytium. In C. australensis, oesophageal secretion appeared to be responsible for initial extracellular digestion and this was followed by pinocytotic uptake of partly degraded material in pits between the numerous apical lamellae of digestive cells. Posterior dorsolateral gut pockets unique to C. australensis were shown to be blind sacs separated from the external environment by a narrow cytoplasmic bridge, composed of a thin layer of tegument apposed to a thin layer of pocket syncytial epithelium. The pockets are lined with greatly folded syncytium and set in a “capsule” of tissue in which numerous pro-tonephridial flame cells are embedded. It is suggested that the pockets have an osmoregulatory function related to the particular environment and evolutionary history of the host, the primitive lung fish (Dipnoi) Neoceratodus forsteri (Krefft, 1870).

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

277-286 and 39-48

Source:

Folia parasitologica | 1996 Volume:43 | Number:4

Harvested from:

CDK

Metadata only:

false