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Korean J Parasitol > Volume 21(1):1983 > Article

Original Article
Korean J Parasitol. 1983 Jun;21(1):118-124. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1983.21.1.118
Copyright © 1983 by The Korean Society for Parasitology
Classification of Planorbidae cellected from Geum river basin
Chong-Hwan Kim and In-Sik Song
Department of Biology, College of Natural Sciences, Chung Nam National University, Korea.

The distribution, external morphology, radula, chromosome numbers of Planorbidae snails were studied.

1. The specimens were collected at four stations in Nonsangun, Kongjugun, and Daedukgun which are located around Geum river. Three genera and three species of Planorbidae, Hippeutis cantori, Segmentina hemisphaerula and Gyraulus convexiusculus, were collected. H. cantori was the most abundant species among the three species. G. convexiusculus was the least abundant one.

2. Each species could be identified on the basis of its external characteristic, since the periphery of each species has a peculiar shape. H. cantori was the largest one among the three species.

3. The radula formula of each species was very similar to other species. The size of radula was proportional to the size of shell. The radula formulae of H. cantori, S. hemisphaerula, and G. convexiusculus were 29:1:29, 23:l:23, and 16:1:16 respectively. The difference of radula formula could be found in the total numbers of laternal and marginal teeth.

4. The haploid chromosome number of H. cantori was eighteen (n=18). S. hemisphaerula and G. convexiusculus were assumed to be same in their chromosome numbers (n=18).


Fig. 1
External morphology of Planorbidae.

Fig. 2
Shells of three species of Planorbidae.

1. Hippeutis cantori(Benson), 2. Segmentina hemisherula(Benson), 3. Gyraulus convexiusculus(Benson), (Scales are 5mm.)

Fig. 3
Shells of there species of Planorbidae.

1. Hippeutis cantori

2. Segmentina hemisphaerula

3. Gyraulus convexiusculus

Fig. 4
Chromosomes of three species of Planorbidae. (Bars indicate 5µm)


Table 1
Distribution of Planorbidae around the middle stream of Geum River

Table 2
Shell size of three species of Planorbidae

Table 3
Radula ribbon size of three species of Planorbidae

Table 4
Radula formula of three species of Planorbidae (20 individuals each)

Table 5
Observed haploid chromosome numbers(n) of three species of Planorbidae

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