Studies on cercariae from the Kuwait Bay. VI. Description and surface topography of <i>Cercaria kuwaitae</i> VI sp. n. (Trematoda: Haplosplanchnidae)

, Abdul-Salam, J; , Sreelatha, B N

doi:1995.33.3.147

Korean J Parasito > Volume 33(3):1995 > Article

Original Article


Korean J Parasitol. 1995 Sep;33(3):147-153. English. Published online Sep 20, 1995. http://dx.doi.org/10.3347/kjp.1995.33.3.147
Copyright © 1995 by The Korean Society for Parasitology


Studies on cercariae from the Kuwait Bay. VI. Description and surface topography of Cercaria kuwaitae VI sp. n. (Trematoda: Haplosplanchnidae)
J Abdul-Salam,^* and B N Sreelatha
Department of Zoology, University of Kuwait, P.O. Box 5969, Safat, Kuwait 13060.

Received March 21, 1995; Accepted June 22, 1995.
Abstract
A new haplosphlanchnid cercaria, Cercaria kuwaitae VI sp. n., was found in the prosobranch snail Cerithidea cingulata in the Kuwait Bay. Details are presented on the morphology and behavior of the cercaria and the encystment process. The new cercaria is a biocellate, distome, with a prominent single sac-like intestinal cecum extending well posterior to the ventral sucker and develops in simple sporocysts. It differ from known haplosplanchnid cercariae in the absence of finger- like processes on the tail, and the presence of V-shaped excretory vesicle extending beyond ventral sucker and the presence of cervical glands. The surface topography of the cercaria and its sporocyst is examined by scanning electron microscopy. This is the first haplosplanchnid cercaria to be described from a Cerithidea species.

Figures


	Figs. 1-2 Drawing of Cercaria Kuwaitae VI, cercaria. 1. Ventral view of entire cercaria. 2. Excretory system and cystogenous glands.

Figs. 3-7
Scanning electron micrographs of Cercaria Kuwaitae VI, cercaria. 3. Lateral view of an entire cercaria showing tegumental surface fold into concentrically arranged ridges, ventral and oral suckers, and finely annulate slender tail. Scale bar = 100 µm. 4. Sub-terminal region showing averted oral sucker with ridges radiating from the oral cavity and domed papillae concentrically arranged around the oral lip. The body papillae disposed in bilaterally symmetrical longitudinal lines. Scale Bar= 20 µm. 5. Sub-terminal region showing inverted oral sucker exposing two types of domed papillae, large and small with openings (arrowheads). Scale bar = 20 µm. 6. Mid-ventral region showing the ventral sucker with centrally radiating ridges and surrounded by domed papillae of various types. Scale bar= µm. 7. Immature cercaria showing genital pore surrounded by a sucker-like structure, located anterior to the ventral sucker. Scale bar = 40 µm.


	Figs. 8-9 Drawings of Cercaria Kuwaitae VI, sporocyst. 8. Entire mature sporocyst containing cercariae. 9. Excretory system.


	Figs. 10-11 Scanning electron micrographs of Cercaria Kuwaitae VI, sporocyst. 10. Mature sporocyst showing elongate body bearing impressions of intrasporocyst cercariae. Scale bar = 100 µm. 11. The anterior end showing terminal birth pore. Scale bar = 10 µm.


	Figs. 12-13 Scanning electron micrographs of Cercaria Kuwaitae VI, metacercaria. 12A-D. Process of cercaria encystment (freehand). 13. Ventral view of an entire metacercaria.

Tables


	Table 1 Body dimensions (µm) of the cercariae of Cercaria Kuwaitae VI sp. n.

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