You are here Articles MORPHOLOGY AND SEXUAL DIMORPHISM OF THE JAGOR’S WATER SNAKE, Enhydris jagorii AT BUNG KA LOH WETLAND, UTTARADIT PROVINCE, THAILAND

MORPHOLOGY AND SEXUAL DIMORPHISM OF THE JAGOR’S WATER SNAKE, Enhydris jagorii AT BUNG KA LOH WETLAND, UTTARADIT PROVINCE, THAILAND

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jagors-water-snake_smallThe Jagor’s water snake, Enhydris jagorii is belonging to Family Homalopsidae is an endemic species restricted to the ChaoPhraya - Ta Chin basin in the central plain of Thailand. This freshwater snake has been facing the population decline due toits freshwater habitats have been changed dramatically and disturbed by many human activities. In order to help protectingthis little known endemic species from being threaten, the basic information regarding its biological aspects is needed.

Theaim of this research is to investigate the morphology and sexual dimorphism of this freshwater snake collected from BungKa Loh wetland located in the northern part of Chao Phraya - Ta Chin basin. In this study, 6 morphological characteristicswere employed and measured and 5 characters of scale rows were counted and calculated from male and female specimenscollected from this wetland during October, 2010 to August, 2012. The data of sexual dimorphism recorded in this studywas the first report of this freshwater homalopsid species. The results indicated that females exhibited larger and heavierthan males in term of overall body size and weight, but not tail length. Males showed the significant difference by longer intail length at the same size of SVL than female one. Furthermore, morphological characteristics measurements were takenon neonates. This first attempt resulted in success in this study. This basic information is very important in term of settingup conservation and management procedures in order to help protecting this endemic species from threats by controling themesh-size of trapping gill nets which is effected to population decline of Jagor’s water snake in its habitat in this wetland.

Key words: Homalopsidae, morphology, scalation, sexual dimorphism, freshwater snake, Enhydris jagorii, neonate

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