Studies on Cercariae from Kuwait Bay. XI. Description and surface topography of Cercaria kuwaitae XI sp.n. (Digenea: Echinostomatidae)

Abstract

A new echinostome cercaria, Cercaria kuwaitae XI sp.n., from the prosobranch gastropod Cerithidea cingulata (Gmelin) from Kuwait Bay is described. The new cercaria is characterized by 23 collar spines and primary excretory tubules with distinct diverticula. The cercaria encysts in the snail host and is similar to those of Acanthoparyphium sp. The surface topography of the redia, cercaria and metacercarial cyst wall is studied by scanning electron microscopy. This is the first echinostome cercaria to be recorded in a gastropod from the Arabian Gulf region.Key words: Digenea -Cercaria kuwaitae XI sp.n. -Acanthoparyphium sp. -ultrastructure -Cerithidea cingulataKuwait Bay alcohol (AFA) and staining in acetocarmine. Measurements are in micrometres, the range with the mean in parentheses, and were taken from 20 vitally stained refrigerated specimens. Figures were drawn with the aid of a camera lucida from vitally stained specimens. For SEM, living larval stages were fixed in a solution containing 4% formaldehyde and 1% glutaraldehyde in 0.1 M phosphate buffer (pH 7.2) at 4°C. Following the appropriate buffer wash, the specimens were post-fixed in 1% osmium tetroxide in the same buffer for 5 min at 4°C, dehydrated in a series of anhydrous acetone and critical-point dried. The specimens were coated with gold and then examined in a Jeol JSM-6300 scanning electron microscope.

First Record and Description of Metacercariae of Curtuteria Arguinae N. Sp. (Digenea: Echinostomatidae), Parasite of Cockles Cerastoderma Edule (Mollusca: Bivalvia) in Arcachon Bay, France

“…Studies of the surface ultrastructure of Echinostomatidae have been undertaken in various species and for various developmental stages of the parasites (eggs, rediae, cercariae, metacercariae, and adults) (Fried and Fujino, 1987;Fried et al, 1990;Abdul-Salam and Sreelatha, 1999;Fujino and Ichikawa, 2000;Maldonado et al, 2001;Sohn et al, 2002;Han et al, 2003). In agreement with Fried et al (1990), SEM studies provide support for a better understanding of echinostomatid taxonomy, and in the present work they were helpful in distinguishing and characterizing C. arguinae n. sp.…”

Bacciger bacciger (Trematoda, Fellodistomidae) infection in commercial clams Donax trunculus (Bivalvia, Donacidae) from the sandy beaches of the Western Mediterranean

“…The number and precise arrangement of sensory receptors have not been determined here or in other SEM studies of daughter sporocysts. Nevertheless, concentration of ciliate sensory papillae around the birth pore was noted in cyathocotylid Cercana kuwaitae I1 daughter sporocysts, infecting the prosobranch Cerithidea cingulata, by Abdul-Salam & Sreelatha (1993). Absence has been reported by Busta & Nasincova (1988) in the plagiorchiid Opistioglyphe ranae, infecting water snails Lymnaea stagnalis, and by Abdul-Salam & Sreelatha (1995) in the Cercaria kuwaitae V1 (Haplosplanchnidae) daughter sporocysts.…”

Mactra veneriformis, an Intertidal Clam, as a New Second Intermediate Host for Acanthoparyphium marilae (Digenea: Echinostomatidae)

“…Brackish water gastropods, bivalves, or oysters play the role of a first or second intermediate host, or both [1][2][3][4][5][6][7][8].In the Republic of Korea, Chai et al [7] reported recently that Acanthoparyphium tyosenense Yamaguti, 1939 causes human infections. The complete life history of A. tyosenense has been previously elucidated; several species of brackish water mollusks have been demonstrated to harbor the metacercariae of A. tyosenense [7,9,10].…”

“…The genus Acanthoparyphium (Digenea: Echinostomatidae) is a group of minute intestinal trematodes which parasitize the small intestine of aquatic birds in marine areas of the Republic of Korea, Japan, USA, the Philippines, Kuwait, India, Puerto Rico, and Australia [1][2][3][4][5][6][7][8]. Brackish water gastropods, bivalves, or oysters play the role of a first or second intermediate host, or both [1][2][3][4][5][6][7][8].…”

“…Brackish water gastropods, bivalves, or oysters play the role of a first or second intermediate host, or both [1][2][3][4][5][6][7][8].…”