Arin Ngamniyom and Busaba Panyarachun

DOI: 10.14456/sjst-psu.2016.6

pp. 41 - 45

Abstract

The genus Stenostomum contains small turbellaria that are widely distributed in freshwater environments worldwide.
However, there are only rare reports or studies of this genus from Thailand. Therefore, the objective of this study was to
report S. cf. leucops in Thailand collected from Pathum Thani Province. The worm morphology and surface topography
using scanning electron microscopy were determined. Moreover, the phylogenetic tree of S. cf. leucops was analysed with
17 flatworms based on the 18S ribosomal DNA sequences. The phylogenetic relationship shared a common ancestry of
Catenulida species, and S. cf. leucops displayed a monophyletic pattern within Stenostomum spp. The results of the morphological and molecular data are discussed. These results may increase the knowledge of freshwater microturbellarians in
Thailand.