Objective:To study the digenean parasites of the prosobranch gastropods,Littorina littorea(L.littorea)and Gibbula umbilicalis(G.umbilicalis)from rocky shores of the Northern Atlantic coast of Portugal.Methods:A total ...Objective:To study the digenean parasites of the prosobranch gastropods,Littorina littorea(L.littorea)and Gibbula umbilicalis(G.umbilicalis)from rocky shores of the Northern Atlantic coast of Portugal.Methods:A total of 413 L.littorea and 2603 G.umbilicalis were collected from rocky shores,at Aveiro estuary,Aguda Beach,and Foz Beach at Porto(Northern Atlantic coast of Portugal)from January to July 2014 and February 2014 to January 2015,respectively.Gonads and digestive glands of the gastropods were examined under light microscopy for the presence of digeneans.Infected gonads of L.littorea were prepared for histological observation,whereas digeneans found in G.umbilicalis were studied and identified with the aid of light and scanning electron microscopy.Results:Two species of digeneans were found infecting the digestive gland and gonads of G.umbilicalis,namely,Cainocreadium labracis and Lecithochirium furcolabiatum with a combined prevalence of 3%.Histological observations of gonads of L.littorea revealed the infection with digeneans,with considerable replacement of gonadal tissues.These digeneans were not identified to species level.The prevalence of digeneans in this snail host was 0.7%.Conclusions:The present study adds G.umbilicalis as another first intermediate host for Cainocreadium labracis and extends its geographical range to the Portuguese Atlantic coast.Cercariae of Lecithochirium furcolabiatum were previously reported from G.umbilicalis.A literature review of digeneans occurring in the gastropod genera Gibbula and Littorina is given.展开更多
The study on trematode larvae found in Egyptian molluscs was initiated by the pioneering work of Sonsino in 1892 and Looss in 1896. Since then tens of cercariae and some digenean life cycles have been reported in the ...The study on trematode larvae found in Egyptian molluscs was initiated by the pioneering work of Sonsino in 1892 and Looss in 1896. Since then tens of cercariae and some digenean life cycles have been reported in the country. Unfortunately, only fragmentary publications are available for identification of cercariae present in the country. In addition, some of such publications may not be accessible to some researchers, as they are either theses or published in old volumes of non-international journals. The present work was carried out with the aim of preserving our heritage through reviewing the different types of cercariae known from the Egyptian inland water snails. We provide a survey based on literature. Major types of cercariae known to exist in the country are covered. They are presented as regards description, development, taxa, importance and snail hosts. This review can be used as a field guide for identification of cercariae colonising the Egyptian inland water snails.展开更多
基金supported by the“Direcção Regional de Agricultura e Pescas do Centro,Divisão de Investimentos de Aveiro”,Portugal,under project“Probur”(Grant No.31-03-05-FEP-0039).
文摘Objective:To study the digenean parasites of the prosobranch gastropods,Littorina littorea(L.littorea)and Gibbula umbilicalis(G.umbilicalis)from rocky shores of the Northern Atlantic coast of Portugal.Methods:A total of 413 L.littorea and 2603 G.umbilicalis were collected from rocky shores,at Aveiro estuary,Aguda Beach,and Foz Beach at Porto(Northern Atlantic coast of Portugal)from January to July 2014 and February 2014 to January 2015,respectively.Gonads and digestive glands of the gastropods were examined under light microscopy for the presence of digeneans.Infected gonads of L.littorea were prepared for histological observation,whereas digeneans found in G.umbilicalis were studied and identified with the aid of light and scanning electron microscopy.Results:Two species of digeneans were found infecting the digestive gland and gonads of G.umbilicalis,namely,Cainocreadium labracis and Lecithochirium furcolabiatum with a combined prevalence of 3%.Histological observations of gonads of L.littorea revealed the infection with digeneans,with considerable replacement of gonadal tissues.These digeneans were not identified to species level.The prevalence of digeneans in this snail host was 0.7%.Conclusions:The present study adds G.umbilicalis as another first intermediate host for Cainocreadium labracis and extends its geographical range to the Portuguese Atlantic coast.Cercariae of Lecithochirium furcolabiatum were previously reported from G.umbilicalis.A literature review of digeneans occurring in the gastropod genera Gibbula and Littorina is given.
文摘The study on trematode larvae found in Egyptian molluscs was initiated by the pioneering work of Sonsino in 1892 and Looss in 1896. Since then tens of cercariae and some digenean life cycles have been reported in the country. Unfortunately, only fragmentary publications are available for identification of cercariae present in the country. In addition, some of such publications may not be accessible to some researchers, as they are either theses or published in old volumes of non-international journals. The present work was carried out with the aim of preserving our heritage through reviewing the different types of cercariae known from the Egyptian inland water snails. We provide a survey based on literature. Major types of cercariae known to exist in the country are covered. They are presented as regards description, development, taxa, importance and snail hosts. This review can be used as a field guide for identification of cercariae colonising the Egyptian inland water snails.
