Studies on the shell morphology of the freshwater snail Paludomus Swainson, 1840 in the Kwae Noi and Kwae Yai river watershed, Kanchanaburi, Thailand
Duangduen krailas, Napatsorn notesiri, Tuenta janecharat, Kampanat tharapoom, Viroj kitikoon and Suluck ukong
20th Biennial Conference of the ASIAN ASSOCIATION FOR BIOLOGY EDUCATION “Roles of Modern Technologies in Biology Education”. Chiang Mai University. Chiang Mai, Thailand. 27-30 December 2004. Page 28.
2004
บทคัดย่อ
Studies on the shell morphology of the freshwater snail Paludomus Swainson, 1840 in the Kwae Noi and Kwae Yai river watershed, Kanchanaburi, Thailand
The freshwater snail of Paludomus Swainson, 1840 collected from ten locations in Kwae Nai river watershed and five locations in the Kwae Yai river watershed, Kanchanaburi, Thailand, was studied. These Paludomus freshwater snails are distinguished by shape, size, shell color pattern, suture, body whorl sculpture, operculum and the other basal periphery. All of them are dextral and the operculum is concentric with spiral. The shells are elonggated and subglobose in shape. The surface is smooth and covered with a brownish or greenish periderm. Most of them show pointed apex, deep suture, and narrow columella. However, the snails of Tao Dum stream, one of the tem survey locations in the Kwae Noi river watershed, are markedly different from the others in that they show eroded apex, shallow suture, and wide columella. In addition, when the ratios of the length of body whorl / shell length and size index are analyzed using ANOVA tests, Tao Dum snails exhibits significant difference (P<0.05) in the size index. Duncan multiple range test and Scheffe test futther support the finding.