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Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) in the Republic of Korea and its surface ultrastructure.

Han ET, Park JH, Chai JY - Korean J. Parasitol. (2012)

Bottom Line: The cercariae were found freely swimming or enveloped within daughter sporocysts when the snail host was mechanically broken.Around the oral sucker, several sensory papillae, each with a short cilium, were distributed, and on the tail, sensory papillae, each with an extensively long cilium, were observed.This is the first record describing a cyathocotylid cercaria from a brackish water gastropod in the Republic of Korea.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 200-701, Korea.

ABSTRACT
Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) was detected from a brackish water gastropod species (Cerithideopsilla cingulata) in a coatal area of Shinan-gun, Jeollanam-do (Province), the Republic of Korea, and its surface ultrastructure was studied using a scanning electron microscope. The cercariae were found freely swimming or enveloped within daughter sporocysts when the snail host was mechanically broken. They were morphologically characterized by a linguiform and ventrally concave body, a long and bifurcated tail, and the presence of a holdfast (=tribocytic) organ posterior to the ventral sucker. On the whole ventral and dorsal surfaces, peg-like tegumental spines were densely distributed. Around the oral sucker, several sensory papillae, each with a short cilium, were distributed, and on the tail, sensory papillae, each with an extensively long cilium, were observed. This is the first record describing a cyathocotylid cercaria from a brackish water gastropod in the Republic of Korea.

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Scanning electron micrographs of Cercaria caribbea LVIII cercaria. (A) Ventral view of a cercarial body and bifurcated tail. Bar=50 µm. (B) A cercarial body showing the oral and ventral suckers, ventral view. Tegumental spines are densely distributed in anterior surface of the body. Bar=14 µm. (C) The bifurcated tails look like oars. Bar=17 µm. (D) On the tip of each furca, several spines are observed, which are larger than those of the general cuticular spination. Two sensory papillae with a long cilium are seen on the fin (lower) and 2 others are obsercved anterior to the tip (upper). Bar=3 µm. (E) On the lip of the oral sucker, sensory papillae with a short cilium are distributed, and peg-like spines are seen on the surface. Bar=3 µm. (F) Ventral sucker was premature, and a primordial tribocytic organ is seen posteriorly close to the ventral sucker. Bar=8 µm. (G) Peg-like tegumental spines densely distributed on the body surface and furcae. Bar=1 µm. (H) A tegumental groove or pit located posteriorly far from the tribocytic organ. Bar=3 µm. (I) Surface of a part of the tail stem revealing sensory papillae with a long cilium. Bar=3 µm. (J) Long-ciliated sensory papillae on the base of the furcae. Bar=3 µm.
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Figure 2: Scanning electron micrographs of Cercaria caribbea LVIII cercaria. (A) Ventral view of a cercarial body and bifurcated tail. Bar=50 µm. (B) A cercarial body showing the oral and ventral suckers, ventral view. Tegumental spines are densely distributed in anterior surface of the body. Bar=14 µm. (C) The bifurcated tails look like oars. Bar=17 µm. (D) On the tip of each furca, several spines are observed, which are larger than those of the general cuticular spination. Two sensory papillae with a long cilium are seen on the fin (lower) and 2 others are obsercved anterior to the tip (upper). Bar=3 µm. (E) On the lip of the oral sucker, sensory papillae with a short cilium are distributed, and peg-like spines are seen on the surface. Bar=3 µm. (F) Ventral sucker was premature, and a primordial tribocytic organ is seen posteriorly close to the ventral sucker. Bar=8 µm. (G) Peg-like tegumental spines densely distributed on the body surface and furcae. Bar=1 µm. (H) A tegumental groove or pit located posteriorly far from the tribocytic organ. Bar=3 µm. (I) Surface of a part of the tail stem revealing sensory papillae with a long cilium. Bar=3 µm. (J) Long-ciliated sensory papillae on the base of the furcae. Bar=3 µm.

Mentions: Description of sporocysts and cercariae is based on light and scanning electron microscopic examinations. Sporocysts had a cylindrical body with transverse ridges on the tegumental surface (Fig. 1A). Mature and immature cercariae were observed within the sporocysts (Fig. 1B, C). The cercarial body was linguiform, concave ventrally, and its tail was bifurcated with characters of the cyathocotylid group (Figs. 1D, E, 2A). The tegument of the body and tail was covered with densely distributed sharp-pointed peg-like spines (Fig. 2B-J). Single type I papillae were circularly arranged on the ventral surface of the body symmetrically.


Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) in the Republic of Korea and its surface ultrastructure.

Han ET, Park JH, Chai JY - Korean J. Parasitol. (2012)

Scanning electron micrographs of Cercaria caribbea LVIII cercaria. (A) Ventral view of a cercarial body and bifurcated tail. Bar=50 µm. (B) A cercarial body showing the oral and ventral suckers, ventral view. Tegumental spines are densely distributed in anterior surface of the body. Bar=14 µm. (C) The bifurcated tails look like oars. Bar=17 µm. (D) On the tip of each furca, several spines are observed, which are larger than those of the general cuticular spination. Two sensory papillae with a long cilium are seen on the fin (lower) and 2 others are obsercved anterior to the tip (upper). Bar=3 µm. (E) On the lip of the oral sucker, sensory papillae with a short cilium are distributed, and peg-like spines are seen on the surface. Bar=3 µm. (F) Ventral sucker was premature, and a primordial tribocytic organ is seen posteriorly close to the ventral sucker. Bar=8 µm. (G) Peg-like tegumental spines densely distributed on the body surface and furcae. Bar=1 µm. (H) A tegumental groove or pit located posteriorly far from the tribocytic organ. Bar=3 µm. (I) Surface of a part of the tail stem revealing sensory papillae with a long cilium. Bar=3 µm. (J) Long-ciliated sensory papillae on the base of the furcae. Bar=3 µm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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Figure 2: Scanning electron micrographs of Cercaria caribbea LVIII cercaria. (A) Ventral view of a cercarial body and bifurcated tail. Bar=50 µm. (B) A cercarial body showing the oral and ventral suckers, ventral view. Tegumental spines are densely distributed in anterior surface of the body. Bar=14 µm. (C) The bifurcated tails look like oars. Bar=17 µm. (D) On the tip of each furca, several spines are observed, which are larger than those of the general cuticular spination. Two sensory papillae with a long cilium are seen on the fin (lower) and 2 others are obsercved anterior to the tip (upper). Bar=3 µm. (E) On the lip of the oral sucker, sensory papillae with a short cilium are distributed, and peg-like spines are seen on the surface. Bar=3 µm. (F) Ventral sucker was premature, and a primordial tribocytic organ is seen posteriorly close to the ventral sucker. Bar=8 µm. (G) Peg-like tegumental spines densely distributed on the body surface and furcae. Bar=1 µm. (H) A tegumental groove or pit located posteriorly far from the tribocytic organ. Bar=3 µm. (I) Surface of a part of the tail stem revealing sensory papillae with a long cilium. Bar=3 µm. (J) Long-ciliated sensory papillae on the base of the furcae. Bar=3 µm.
Mentions: Description of sporocysts and cercariae is based on light and scanning electron microscopic examinations. Sporocysts had a cylindrical body with transverse ridges on the tegumental surface (Fig. 1A). Mature and immature cercariae were observed within the sporocysts (Fig. 1B, C). The cercarial body was linguiform, concave ventrally, and its tail was bifurcated with characters of the cyathocotylid group (Figs. 1D, E, 2A). The tegument of the body and tail was covered with densely distributed sharp-pointed peg-like spines (Fig. 2B-J). Single type I papillae were circularly arranged on the ventral surface of the body symmetrically.

Bottom Line: The cercariae were found freely swimming or enveloped within daughter sporocysts when the snail host was mechanically broken.Around the oral sucker, several sensory papillae, each with a short cilium, were distributed, and on the tail, sensory papillae, each with an extensively long cilium, were observed.This is the first record describing a cyathocotylid cercaria from a brackish water gastropod in the Republic of Korea.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon 200-701, Korea.

ABSTRACT
Cercaria caribbea LVIII Cable, 1963 (Digenea: Cyathocotylidae) was detected from a brackish water gastropod species (Cerithideopsilla cingulata) in a coatal area of Shinan-gun, Jeollanam-do (Province), the Republic of Korea, and its surface ultrastructure was studied using a scanning electron microscope. The cercariae were found freely swimming or enveloped within daughter sporocysts when the snail host was mechanically broken. They were morphologically characterized by a linguiform and ventrally concave body, a long and bifurcated tail, and the presence of a holdfast (=tribocytic) organ posterior to the ventral sucker. On the whole ventral and dorsal surfaces, peg-like tegumental spines were densely distributed. Around the oral sucker, several sensory papillae, each with a short cilium, were distributed, and on the tail, sensory papillae, each with an extensively long cilium, were observed. This is the first record describing a cyathocotylid cercaria from a brackish water gastropod in the Republic of Korea.

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