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KMID : 0377619900550120821
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Korean Jungang Medical Journal
1990 Volume.55 No. 12 p.821 ~ p.831
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Morphological Comparative Studies on the Molluscan Intermediate Host of Fasciooa
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Abstract
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Lymnaea auricularia and L. pervia are well known as intermediate host snails of Fasciola species in Korea. The distribution, habitat and the morphology difference of those were comparatively studies and summarized as follows;
1. L. auricular was collected in 113 places (53.1 %) and L. per via (36.6 %) in 78 places. Therefore, L. auricular was more largely distributed than L. per via and two species of Lymnaea were distributed mostly around the Keen river basin.
2. Among 213 regions which two species of Lymnaea lived, the habitat of L. auricularia was 113 places. Among them, there were 41 regions out of 51 regions of stream, 28 regions out of 38 regions of irrigable routes, 24 regions out of 26 rations of drainages and they lived in flowing streams. L. pervia was collected 53 regions out of 83 regions of paddy field and distributed in mostly still water.
3. In the morphological point of view, the body length and body width of L. auricularia were 17.76 + 1.34 mm x 11.98 ± 1.12 mm, those of L. pervia were 8.50 + 0.63 mm x 5.08= 0.44 mm. Therefore, L. auricularia was larger than L. pervia. The aperture of L. auricularia was wide ovate or globose, while L. pervia was an elongated oval type and the aperture length/body length of L. auricularia were 81.5 %, while those of L. pervia were less than 70 %; there was a remarkable difference between L. auricularia and L. Periva in the shell type of Lymnaea of two species.
4. For the radulla structure of the two species, there were no difference in central teeth and lateral teeth, while there was a little difference in marginal teeth.
5. In the structure of male copulatory organ, the penis sheath of L. auricularia was shorter than praeputium and sperm duct was rather slender and two muscular pillars were well developed. On the other hand, the length ratio between praeputium and penis in L. pervia varied. The muscular pillars were of the ordinary size and velum varied very much as to size.
From the above results, among the intermediate host snails of Fasciola species, L. auricularia and L. pervia widly distributed in Korea showed remarkerable differences on the morphology and ecology of snails.
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