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ISSN : 1225-3480
우리나라를 비롯한 아시아, 유럽, 호주 등에서 채집한 쇠우렁이 과 패류 8종 (Bithynia striatula, B. tentaculata, B. siamensis, B. leachi, B. kiusiuensis, B. misella, Bithynia sp., Gabbia australis) 을 대상으로 주사전자현미경 (SEM) 을 이용하여 치설을 관찰한 바 다음과 같은 결과를 얻었다. 치설열의 수는 B. siamensis와 B. leachi의 경우 60-70개로 다른 종들의 치설열의 수 40-50개보다 많았다. 관찰한 8종의 패류의 치설 구조는 좌우대칭으로 한 치설열에 7개의 치아가 있었다. 즉 1개의 중치를 중심으로 좌우에 각각 1개의 측치와 2개의 외연치가 분포하였다. 따라서 기본 치설식은 2:1:1:1:2로 표시할 수 있었다. 소첨두의 수와 모양은 개체별, 종별로 차이가 있었으며 중치에만 기저돌기가 분포하였다. 중치의 중앙돌기의 구조는 B. striatula, B. tentaculata, B. siamensis 및 Bithynia sp.의 구조가 다른 종들과 차이가 있었다.
Eight species of the family Bithyniidae, Bithynia striatula, B. tentaculata, B. siamensis, B. leachi, B. kiusiuensis, B. misella, Bithynia sp. from Nepal, and Gabbia australis were studied for comparison of the radula structure by scanning electron microscope. Radular ribbons of B. siamensis and B. leachi had 60-70 rows, and the other species had 40-50 rows in the radula. Teeth of all species studied had symmetrical structure, i.e. a total of seven teeth (one central tooth and one lateral and two pairs of marginal teeth on each side) in each row were observed. The basic tooth formula of eight bithyniids was 2:1:1:1:2. Numbers and shapes of cusps were slightly differ from individuals or species. The mesocone of the central tooth of B. striatula, B. tentaculata, B. siamensis and Bithynia sp. differed from those of the other species observed.
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